Cell Survival Signaling Pathways Research Articles

Photobiomodulation and Physical Exercise Modulate of Cell Survival Proteins in the Skeletal Muscle of Rats with Heart Failure and Diabetes Mellitus.

Introduction: Heart failure (HF) and type 2 diabetes mellitus (DM2) are global health problems that often lead to muscle atrophy. These conditions are associated with increased autophagy and apoptosis in the muscle cells, resulting in decreased muscle mass. Physical exercise associated with photobiomodulation (PBM) seems promising to attenuate the skeletal muscle changes caused by HF and DM2, due to its direct effects on mitochondria, which may result in an increase in antioxidant capacity. Objective: To verify the influence of physical exercise and the association with PBM on autophagy, apoptosis, and cell survival signaling pathways in myocytes from rats with HF and DM2. Materials and Methods: Male rats were assigned to one of four groups: control (CT), HF+DM (disease model), exercise+HF+DM (EX+HF+DM), and EX+HF+DM+PBM (EX+HF+DM+PBM). To induce DM2, we administered streptozotocin (STZ) (0.25 mL/kg, intraperitoneally). HF was induced by coronary ligation. One week post-induction, an 8-week aerobic exercise and PBM protocol was initiated. Western blot analysis was used to measure the expression of apoptosis-related proteins and autophagy. Results: The EX+HF+DM+PBM group showed a substantial increase in Nrf2, p-AKT, and LC3-I levels compared to the HF+DM group. Conclusions: These findings suggest that physical exercise combined with PBM can upregulate proteins that promote myocyte survival in rats with HF and DM2.

Unlocking the potential: advancements and future horizons in ROR1-targeted cancer therapies.

While receptor tyrosine kinase-like orphan receptor 1 (ROR1) is typically expressed at low levels or absent in normal tissues, its expression is notably elevated in various malignant tumors and conditions, including chronic lymphocytic leukemia (CLL), breast cancer, ovarian cancer, melanoma, and lung adenocarcinoma. This distinctive feature positions ROR1 as an attractive target for tumor-specific treatments. Currently, several targeted drugs directed at ROR1 are undergoing clinical development, including monoclonal antibodies, antibody-drug conjugates (ADCs), and chimeric antigen receptor T-cell therapy (CAR-T). Additionally, there are four small molecule inhibitors designed to bind to ROR1, presenting promising avenues for the development of PROTAC degraders targeting ROR1. This review offers updated insights into ROR1's structural and functional characteristics, embryonic development implications, cell survival signaling pathways, and evolutionary targeting strategies, all of which have the potential to advance the treatment of malignant tumors.

Adipokine Modulation in Endometrial Hyperplasia by Polyunsaturated Fatty Acids

Background Obesity is associated with a higher prevalence of endometrial hyperplasia, thereby increasing the risk of endometrial and ovarian cancers. The precise mechanisms linking obesity to endometrial hyperplasia remain unclear, but dysregulation of adipose tissue homeostasis is known to play a significant role. Hypertrophied adipocytes in obese individuals secrete various bioactive substances, including cytokines, growth factors, hormones, and metabolites. Additionally, hyperplastic adipocytes exhibit enhanced aromatase activity, leading to increased estrogen synthesis, which further promotes the development of endometrial hyperplasia. Purpose The purpose of this study is to explore the anti-inflammatory and anti-proliferative activities of the poly unsaturated fatty acids. Methodology An extensive literature survey has been performed to identify the role of adipokines and elevated endogenous estrogen levels in activating cell survival signaling pathways, such as PI3K/Akt/mTOR, MEK/ERK1, and JAK–STAT in endometrial cells and their possible role in Endometrial Hyperplasia. Further, the possible beneficial anti-inflammatory and anti-proliferative effects of polyunsaturated fatty acids (PUFAs) such as eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and arachidonic acid (AA) were explored. Results Numerous studies suggest the beneficial role of dietary fats, such as EPA, DHA, and AA in modulating the growth of endometrium in obesity-induced endometrial hyperplasia. PUFAs can activate adenosine monophosphate-activated protein kinase (AMPK), which inhibits gluconeogenesis and lipogenesis. It also phosphorylates acetyl-CoA, leading to a decrease in malonyl-CoA, which inhibits mitochondrial CPT1. Additionally, AMPK activation promotes β-oxidation, and PPAR-γ mechanisms by down regulating the NF-kB pathway involved in endometrial hyperplasia. Conclusion This review sheds light on the potential of PUFAs in mitigating estrogen synthesis, adipokine secretion, and endogenous aromatase activity in obesity induced endometrial hyperplasia. Furthermore, it critically evaluates the role and mechanisms of PUFAs in attenuating obesity-associated endometrial hyperplasia and reducing the risk of ovarian cancer.

Extracts of Cistus creticus cultivated at different salinity levels exhibit promising therapeutic potential for pancreatic cancer cell lines

BackgroundCistus creticus L. subsp. creticus is a characteristic species commonly distributed in the Mediterranean region. It has been proved to contain antibacterial, antifungal, anti-inflammatory, and anti-cancer traits. PurposeIn this study, C. creticus plants were grown in hydroponic culture under different salinity levels (0, 30, or 60 mM NaCl) and were extracted using two other solvents (70 % ethanol and distilled water). The effect of salinity on plant growth and mineral homeostasis, biochemical content of extracts and therapeutic impact on cell death and cell survival in pancreatic cancer cell lines were studied. MethodsPancreatic cancer cell lines (PANC-1, MIA PaCa-2, and AsPC-1) were treated with different C. creticus extracts were grown, and cell survival, autophagy and apoptosis signaling pathways were measured. ResultsEspecially, ethanol extraction of C. creticus showed a remarkably therapeutic effect on cell death and cell survival. Ethanol extracts have higher polyphenolic content and are more effective than water extracts. It has been found that C. creticus is an important mitochondria-targeted antioxidant in pancreatic cancer cells. ConclusionThis research could be important to evaluate how stress physiology relates to the chemical composition and the therapeutic effectiveness of C. creticus.

Inhibition of HSP90AA1 induces abnormalities in bovine oocyte maturation and embryonic development.

HSP90AA1 is a ubiquitous molecular chaperone that can resist cellular stress, such as oxidative stress and apoptosis, and mediate the efficacy and protein folding of normal cells during heat stress, as well as many other functions. This study further reveals the role of HSP90AA1 in bovine oocyte maturation and early embryonic development. HSP90AA1, a highly abundant and ubiquitous molecular chaperone, plays important roles in various cellular processes including cell cycle control, cell survival, and hormone signaling pathways. In this study, we investigated the functions of HSP90AA1 in bovine oocyte and early embryo development. We found that HSP90AA1 was expressed at all stages of development, but was mainly located in the cytoplasm, with a small amount distributed in the nucleus. We then evaluated the effect of HSP90AA1 on the in vitro maturation of bovine oocytes using tanespimycin (17-AAG), a highly selective inhibitor of HSP90AA1. The results showed that inhibition of HSP90AA1 decreased nuclear and cytoplasmic maturation of oocytes, disrupted spindle assembly and chromosome distribution, significantly increased acetylation levels of α-tubulin in oocytes and affected epigenetic modifications (H3K27me3 and H3K27ac). In addition, H3K9me3 was increased at various stages during early embryo development. Finally, the impact of HSP90AA1 on early embryo development was explored. The results showed that inhibition of HSP90AA1 reduced the cleavage and blastocyst formation rates, while increasing the fragmentation rate and decreasing blastocyst quality. In conclusion, HSP90AA1 plays a crucial role in bovine oocyte maturation as well as early embryo development.

Combined Inhibition of Protein Kinase CSNK2 and BET Proteins As a Novel Therapeutic Strategy for Mantle Cell Lymphoma

Currently available therapeutic approaches for Mantle Cell Lymphoma (MCL), including the Bruton Tyrosine Kinase (BTK) inhibitors ibrutinib, acalabrutinib and zanubrutinib, are not curative. Therefore, the discovery of novel molecules amenable of drug targeting is a research priority in the MCL field. Bromodomain-containing protein 4 (BRD4) is a member of the Bromodomain (B) and extra terminal (ET) (BET) protein family that regulate chromatin modifications and assembly of transcriptional complexes. Inhibition of BET by available compounds have shown promising anticancer effect. In MCL, BET inhibitors, such as INCB054329 or JQ-1, have been shown to increase apoptosis through downregulation of the AKT-mTOR, ERK, and other B Cell Receptor (BCR)-triggered cascades. We and others have previously demonstrated that the S/T kinase CSNK2 supports chronic BCR activation in MCL by upregulating the AKT/PI3K and NF-κB pathways. Inactivation of CSNK2 results in efficacious induction of MCL cell death. Notably, BRD4 activity is regulated by CSNK2 and double inhibition of BRD4 and CSNK2 has shown significant activity in other tumor models. The most effective and tested CSNK2 chemical inhibitor is CX4945 (silmitasertib), but very recently a novel compound, SGC-CK2, has been developed. No data are available on the effects of SGC-CK2 on MCL cells. In this work, we have evaluated the effects of the combined inhibition of CSNK2 and BET proteins on MCL cell growth and survival signaling pathways. CSNK2 inhibitors employed were CX4945 and SGC-CK2. CSNK2 gene silencing was achieved with the generation of anti- CSNK2 short hairpin-RNA IPTG-inducible MCL cell clones. BET inhibitors used were JQ-1 and INCB054329. Cell survival, apoptosis and proliferation were investigated by AnnexinV/PI staining and FACS analysis, by Western blot (WB) detection of PARP cleavage and Mcl1 expression and by other cell proliferation assays. The synergic action of BET and CK2 inhibitors was assessed by the Chou-Talalay combination index method. CK2 expression and survival-related signaling components were analyzed by WB, qRT-PCR and protein expression assays. CX4945 and the novel inhibitor SGC-CK2 displayed a potent anti-tumor activity on MCL cells as judged by the effective induction of apoptosis and proliferation arrest. A synergistic effect of CSNK2 and BET inhibitors was observed in all the MCL cell lines tested, (Jeko-1, Rec-1, including Granta-519 that are known to be much less sensitive to ibrutinib) and with all the inhibitors tested. The same results were obtained in the CSNK2 gene silencing models. Preliminary data showed that the cooperative cytotoxic effect of CK2 inhibition and BET inhibition on MCL apoptosis was observed also in MCL patient derived B cells, but not in healthy B lymphocytes form buffy coat. CSNK2 inactivation was associated with strong down-regulation of c-Myc and Mcl-1 proteins and with hampered activation of NF-κB and PI3K/AKT-dependent signaling. Surprisingly, BET protein inhibition caused increased Mcl-1 protein expression and augmented Ser 529 p65-NF-kB phosphorylation in Granta-519 and Rec-1 cells. Remarkably, CK2 inactivation led to a robust reduction of the BET inhibitor-induced increase of Mcl1, and NF-kB Ser 529 phosphorylation, thus counteracting BET-inhibitors-evoked compensatory pathways that could favor apoptosis resistance. Therefore, combined CSNK2 and BET proteins inhibition could represent an innovative strategy for chemotherapy and BTKi-resistant MCL.

Integration of LC-LTQ-Orbitrap-MS and Network Pharmacology to Analyze the Active Components of Sijunzi Decoction and their Mechanism of Action Against Cytotoxicity-associated Premature Ovarian Insufficiency.

Sijunzi Decoction (SJZD) is a classical prescription in traditional Chinese medicine that enhances neuroimmune endocrine function to alleviate inflammatory aging, a key pathogenic mechanism underlying premature ovarian insufficiency (POI). However, the mechanism through which SJZD alleviates POI remains unknown. Hence, we aimed to identify the active components of SJZD and its mechanism of therapeutic action against POI. We identified compounds in SJZD using liquid chromatography-linear trap quadrupole-Orbitrap-mass spectrometry (LC-LTQ-Orbitrap-MS) and the TCMSP, HERB, Swiss, SEA, and STRING databases. We analyzed Gene Ontology (GO) terms and enriched Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways using RStudio and constructed a visual network using Cytoscape. We identified 98 compounds using LC-LTQ-Orbitrap-MS, among which 29 were bioactive and screened using the databases. The screen yielded 151 predicted targets of these compounds that were associated with POI. The results of the GO and KEGG analyses showed that these compounds play key roles in cell growth, division, migration, and survival signaling pathways. Therefore, phosphatidylinositol 3-kinase (PI3K)/AKT, mitogen-activated protein kinase (MAPK), and epidermal growth factor receptor (EGFR) pathways might be closely associated with the pharmacological effects of SJZD on the pathological processes of POI. Our findings provide a scientific basis for rapidly analyzing bioactive compounds in SJZD and their pharmacological mechanisms.

SAR study of niclosamide derivatives for neuroprotective function in SH-SY5Y neuroblastoma

Neurodegenerative disease is a debilitating and incurable condition that affects millions of people around the world. The loss of functions or malfunctions of neural cells are the causes of mortality. A proteosome inhibitor, MG132, is well known to cause neurodegeneration in vitro when model neuronal-derived cell lines are exposed to it. Niclosamide, an anthelmintic drug, which has been used to treat tapeworm infections for more than 50 years, has recently attracted renewed attention in drug repurposing because it has been found to be a good candidate in many drug development screenings. We recently found that all markers of MG132-induced neuronal cell toxicity, including the accumulation of ubiquitinated proteins, were prevented by the presence of niclosamide. In addition, niclosamide was shown to enhance autophagy induced by MG132. There results suggested that niclosamide could act as a neuroprotective agent. In the present study, niclosamide derivatives were synthesized, and the structure–activity relationship (SAR) were determined with respect to protein ubiquitination induced by MG132 and effect on cell survival signaling pathways for neuroprotective function. Our results indicate that phenol OH plays a significant role in neuroprotective activity while the niclosamide derivatives without Cl (5- or 2′-Cl) showed almost the same neuroprotective effect. 4′-NO2 can be replaced by N3 or CF3 whereas NH2 significantly decreased activity. These findings provide guidance for the development of new niclosamide analogues against neurodegenerative diseases including Parkinson’s disease.

Molecular basis for nuclear accumulation and targeting of the inhibitor of apoptosis BIRC2.

The inhibitor of apoptosis protein BIRC2 regulates fundamental cell death and survival signaling pathways. Here we show that BIRC2 accumulates in the nucleus via binding of its second and third BIR domains, BIRC2BIR2 and BIRC2BIR3, to the histone H3 tail and report the structure of the BIRC2BIR3-H3 complex. RNA-seq analysis reveals that the genes involved in interferon and defense response signaling and cell-cycle regulation are most affected by depletion of BIRC2. Overexpression of BIRC2 delays DNA damage repair and recovery of the cell-cycle progression. We describe the structural mechanism for targeting of BIRC2BIR3 by a potent but biochemically uncharacterized small molecule inhibitor LCL161 and demonstrate that LCL161 disrupts the association of endogenous BIRC2 with H3 and stimulates cell death in cancer cells. We further show that LCL161 mediates degradation of BIRC2 in human immunodeficiency virus type 1-infected human CD4+ T cells. Our findings provide mechanistic insights into the nuclear accumulation of and blocking BIRC2.

Pax6 affects Ras-Raf-ERK1/2 in mouse aging brain.

Pax6, a transcription factor and multifunctional protein, changes during aging. It also interacts with regulator proteins involved in cell metabolism and survival signalling pathways including Ras-GAP. Many forms of Ras, Raf and ERK1/2 are known but information on their region-specific expression patterns are unavailable from brain during aging. Therefore, it has been intended to evaluate expressions of Pax6 and forms of Ras, Raf, ERK1/2 in hippocampus, caudate nucleus, amygdale, cerebral cortex, cerebellumand olfactory lobe. Association of Pax6 with Ras, Raf and ERK1/2 was evaluated in co-culture (PC-12, C6-glia, U-87 MG) of neuroglia cell lines. Impacts of Pax6 were evaluated by siRNA mediated knockdown and expression patterns Ras-Raf-Erk1/2. Analysis of activities of Pax6 and impacts of 5'AMP, wild-type and mutant ERK were done by RT-PCR and luciferase reporter assay. Results indicate age-dependent changes of Pax6, Ras, Raf, ERK1/2 in different regions of brain of young and old mice. Erk1/2 shows synergistic activities to Pax6.

A back-door insights into the modulation of Src kinase activity by the polyamine spermidine.

Src is a protein tyrosine kinase commonly activated downstream of transmembrane receptors and plays key roles in cell growth, migration and survival signaling pathways. In conventional dendritic cells (cDCs), Src is involved in the activation of the non-enzymatic functions of indoleamine 2,3-dioxygenase 1 (IDO1), an immunoregulatory molecule endowed with both catalytic activity and signal transducing properties. Prompted by the discovery that the metabolite spermidine confers a tolerogenic phenotype on cDCs that is dependent on both the expression of IDO1 and the activity of Src kinase, we here investigated the spermidine mode of action. We found that spermidine directly binds Src in a previously unknown allosteric site located on the backside of the SH2 domain and thus acts as a positive allosteric modulator of the enzyme. Besides confirming that Src phosphorylates IDO1, here we showed that spermidine promotes the protein-protein interaction of Src with IDO1. Overall, this study may pave the way toward the design of allosteric modulators able to switch on/off the Src-mediated pathways, including those involving the immunoregulatory protein IDO1.

Unveiling the MUFA-Cancer Connection: Insights from Endogenous and Exogenous Perspectives.

Monounsaturated fatty acids (MUFAs) have been the subject of extensive research in the field of cancer due to their potential role in its prevention and treatment. MUFAs can be consumed through the diet or endogenously biosynthesized. Stearoyl-CoA desaturases (SCDs) are key enzymes involved in the endogenous synthesis of MUFAs, and their expression and activity have been found to be increased in various types of cancer. In addition, diets rich in MUFAs have been associated with cancer risk in epidemiological studies for certain types of carcinomas. This review provides an overview of the state-of-the-art literature on the associations between MUFA metabolism and cancer development and progression from human, animal, and cellular studies. We discuss the impact of MUFAs on cancer development, including their effects on cancer cell growth, migration, survival, and cell signaling pathways, to provide new insights on the role of MUFAs in cancer biology.

Stress granule formation inhibits stress-induced apoptosis by selectively sequestering executioner caspases

Cytoplasmic stress granules (SGs) are phase-separated membrane-less organelles that form in response to various stress stimuli. SGs are mainly composed of non-canonical stalled 48S preinitiation complexes. In addition, many other proteins also accumulate into SGs, but the list is still incomplete. SG assembly suppresses apoptosis and promotes cell survival under stress. Furthermore, hyperformation of SGs is frequently observed in various human cancers and accelerates tumor development and progression by reducing stress-induced damage of cancer cells. Therefore, they are of clinical importance. However, the precise mechanism underlying SG-mediated inhibition of apoptosis remains ill-defined. Here, using a proximity-labeling proteomic approach, we comprehensively analyzed SG-resident proteins and identified the executioner caspases, caspase-3 and -7, as SG components. We demonstrate that accumulation of caspase-3/7 into SGs is mediated by evolutionarily conserved amino acid residues within their large catalytic domains and inhibits caspase activities and consequent apoptosis induced by various stresses. Expression of an SG-localization-deficient caspase-3 mutant in cells largely counteracted the anti-apoptotic effect of SGs, whereas enforced relocalization of the caspase-3 mutant to SGs restored it. Thus, SG-mediated sequestration of executioner caspases is a mechanism underlying the broad cytoprotective function of SGs. Furthermore, using a mouse xenograft tumor model, we show that this mechanism prevents cancer cells from apoptosis in tumor tissues, thereby promoting cancer progression. Our results reveal the functional crosstalk between SG-mediated cell survival and caspase-mediated cell death signaling pathways and delineate a molecular mechanism that dictates cell-fate decisions under stress and promotes tumorigenesis.

Novel Biomarkers for Inflammatory Bowel Disease and Colorectal Cancer: An Interplay between Metabolic Dysregulation and Excessive Inflammation.

Persistent inflammation can trigger altered epigenetic, inflammatory, and bioenergetic states. Inflammatory bowel disease (IBD) is an idiopathic disease characterized by chronic inflammation of the gastrointestinal tract, with evidence of subsequent metabolic syndrome disorder. Studies have demonstrated that as many as 42% of patients with ulcerative colitis (UC) who are found to have high-grade dysplasia, either already had colorectal cancer (CRC) or develop it within a short time. The presence of low-grade dysplasia is also predictive of CRC. Many signaling pathways are shared among IBD and CRC, including cell survival, cell proliferation, angiogenesis, and inflammatory signaling pathways. Current IBD therapeutics target a small subset of molecular drivers of IBD, with many focused on the inflammatory aspect of the pathways. Thus, there is a great need to identify biomarkers of both IBD and CRC, that can be predictive of therapeutic efficacy, disease severity, and predisposition to CRC. In this study, we explored the changes in biomarkers specific for inflammatory, metabolic, and proliferative pathways, to help determine the relevance to both IBD and CRC. Our analysis demonstrated, for the first time in IBD, the loss of the tumor suppressor protein Ras associated family protein 1A (RASSF1A), via epigenetic changes, the hyperactivation of the obligate kinase of the NOD2 pathogen recognition receptor (receptor interacting protein kinase 2 [RIPK2]), the loss of activation of the metabolic kinase, AMP activated protein kinase (AMPKα1), and, lastly, the activation of the transcription factor and kinase Yes associated protein (YAP) kinase, that is involved in proliferation of cells. The expression and activation status of these four elements are mirrored in IBD, CRC, and IBD-CRC patients and, importantly, in matched blood and biopsy samples. The latter would suggest that biomarker analysis can be performed non-invasively, to understand IBD and CRC, without the need for invasive and costly endoscopic analysis. This study, for the first time, illustrates the need to understand IBD or CRC beyond an inflammatory perspective and the value of therapeutics directed to reset altered proliferative and metabolic states within the colon. The use of such therapeutics may truly drive patients into remission.

Prostate-specific membrane antigen (PSMA), androgen modulation, folic acid, and high-grade prostate cancer: An intriguing nexus needing attention

Prostate cancer is the most common cancer, excluding skin cancer, diagnosed among men in the US. Autopsy studies confirm the high prevalence of indolent prostate cancers starting in the third decade of life. There are lifestyle and therapeutic factors that might be facilitating the transformation of indolent to high-grade cancers throughout life. Prostate-specific membrane antigen (PSMA) is a transmembrane protein that is highly expressed on prostate cancer cells and has diagnostic, prognostic and therapeutic implications. Emerging evidence has elucidated many of its biologic functions, including folate acquisition from the gut, transporting unmetabolized circulating folic acid into prostate cancer cells, involvement in physiologic and neoplastic angiogenesis and redirecting cell survival signaling pathways. Folates are utilized by the prostate for various aspects of reproductive biology. Synthetic oxidized folic acid has been used in grain and cereal fortification in the US since 1998; as a result, folate levels have more than doubled, and most individuals exhibit unmetabolized folic acid in the circulation. In fact, folic acid from fortified foods and supplements is the main driver of folate levels in the population. However, folic acid is a double-edged sword and can support nucleotide synthesis and prostate cancer cell proliferation. As such, the promotion of high-grade prostate cancer by folic acid, but not natural folates, has been evidenced in prospective trials. Ironically, androgen deprivation therapy (ADT), used in the treatment of prostate cancer, leads to increases in both PSMA expression and folate levels. Therefore, we hypothesize that avoiding folic acid intake from fortified foods and supplements will decrease the risk of high-grade prostate cancer and decrease prostate cancer progression, particularly among men undergoing treatment with ADT. Moreover, the nexus of PSMA, folic acid, androgen modulation and high-grade prostate cancer is discussed, along with practical and therapeutic implications. Finally, questions are raised which should spur interest in research that might translate into a reduction in high-grade prostate cancer.

Modulation of Cell Death Pathways for Cellular Protection and Anti-Tumoral Activity: The Role of Thymus spp. Extracts and Their Bioactive Molecules.

Natural products used for their health-promoting properties have accompanied the evolution of humanity. Nowadays, as an effort to scientifically validate the health-promoting effects described by traditional medicine, an ever-growing number of bioactivities are being described for natural products and the phytochemicals that constitute them. Among them, medicinal plants and more specifically the Thymus genus spp., arise as products already present in the diet and with high acceptance, that are a source of phytochemicals with high pharmacological value. Phenolic acids, flavonoid glycoside derivatives, and terpenoids from Thymus spp. have been described for their ability to modulate cell death and survival pathways, much-valued bioactivities in the pharmaceutical industry, that continually sought-after new formulations to prevent undesired cell death or to control cell proliferation. Among these, wound treatment, protection from endogenous/exogenous toxic molecules, or the induction of selective cell death, such as the search for new anti-tumoral agents, arise as main objectives. This review summarizes and discusses studies on Thymus spp., as well as on compounds present in their extracts, with regard to their health-promoting effects involving the modulation of cell death or survival signaling pathways. In addition, studies regarding the main bioactive molecules and their cellular molecular targets were also reviewed. Concerning cell survival and proliferation, Thymus spp. present themselves as an option for new formulations designed for wound healing and protection against chemicals-induced toxicity. However, Thymus spp. extracts and some of their compounds regulate cell death, presenting anti-tumoral activity. Therefore Thymus spp. is a rich source of compounds with nutraceutical and pharmaceutical value.

Canagliflozin Pretreatment Attenuates Myocardial Dysfunction and Improves Postcardiac Arrest Outcomes After Cardiac Arrest and Cardiopulmonary Resuscitation in Mice.

The SGLT2 inhibitor, canagliflozin, not only reduces glycemia in patients with type 2 diabetes but also exerts cardioprotective effects in individuals without diabetes. However, its potential beneficial effects in cardiac arrest have not been characterized. The purpose of this study was to examine the protective effect of canagliflozin pretreatment on postresuscitation-induced cardiac dysfunction in vivo. Male C57/BL6 mice were randomized to vehicle (sham and control) or canagliflozin treatment groups. All mice except for the sham-operated mice were subjected to potassium chloride-induced cardiac arrest followed by chest compressions and intravenous epinephrine for resuscitation. Canagliflozin therapy efficacies were evaluated by electrocardiogram, echocardiography, histological analysis, inflammatory response, serum markers of myocardial injury, protein phosphorylation analysis, and immunohistological assessment. Canagliflozin-pretreated mice exhibited a higher survival rate (P < 0.05), a shorter return of spontaneous circulation (ROSC) time (P < 0.01) and a higher neurological score (P < 0.01 or P < 0.001) than control mice after resuscitation. Canagliflozin was effective at improving cardiac arrest and resuscitation-associated cardiac dysfunction, indicated by increased left ventricular ejection fraction and fractional shortening (P < 0.001). Canagliflozin reduced serum levels of LDH, CK-MB and α-HBDH, ameliorated systemic inflammatory response, and diminished the incidence of early resuscitation-induced arrhythmia. Notably, canagliflozin promoted phosphorylation of cardiac STAT-3 postresuscitation. Furthermore, pharmacological inhibition of STAT-3 by Ag490 blunted STAT-3 phosphorylation and abolished the cardioprotective actions of canagliflozin. Canagliflozin offered a strong cardioprotective effect against cardiac arrest and resuscitation-induced cardiac dysfunction. This canagliflozin-induced cardioprotection is mediated by the STAT-3-dependent cell-survival signaling pathway.

Role of let-7 family in the invasion and metastasis of osteosarcoma.

Role of let-7 family in the invasion and metastasis of osteosarcoma.

The FOXC2 Transcription Factor: A Master Regulator of Chemoresistance in Cancer.

FOXC2, a member of the forkhead box family of transcription factors, is an emerging oncogene that has been linked to several hallmarks of cancer progression. Among its many oncogenic functions is the promotion of drug resistance, with evidence supporting roles for FOXC2 in escape from broad classes of chemotherapeutics across an array of cancer types. In this Mini-Review, we highlight the current understanding of the mechanisms by which FOXC2 drives cancer chemoresistance, including its roles in the promotion of epithelial-mesenchymal transition, induction of multidrug transporters, activation of the oxidative stress response, and deregulation of cell survival signaling pathways. We discuss the clinical implications of these findings, including strategies for modulating FOXC2-associated chemoresistance in cancer. Particular attention is given to ways in which FOXC2 and its downstream gene products and pathways can be targeted to restore chemosensitivity in cancer cells. In addition, the utility of FOXC2 expression as a predictor of patient response to chemotherapy is also highlighted, with emphasis on the value of FOXC2 as a novel biomarker that can be used to guide therapeutic choice towards regimens most likely to achieve clinical benefit during frontline therapy.

Abstract C048: Computational pathway analysis of differentially expressed miRNAs in Black compared with White laryngeal squamous cell carcinoma

Abstract Background: Black patients have maintained higher burden of laryngeal squamous cell carcinoma (LSCC), despite there being an overall decline in the rates of incidence and mortality across the U.S. population. A molecular basis for this disparity remains elusive. In recent years, studies have addressed head and neck disparities via protein coding genes, while ignoring the potential impact of non-coding RNA. Here we explore the manner in which differential expression of miRNAs in Black compared with White LSCC patients may influence the activation of various different downstream molecular pathways. Methods: Differential expression analysis was performed on a dataset generated from small RNA-sequencing of 32 LSCC tumors (16 derived from Black patients, 16 derived from White patients) using the R package DESeq2. For miRNAs identified as differentially expressed between Black and White patient tumors (-log2FC &amp;lt; -1 or log2FC &amp;gt; 1; p adjusted &amp;gt; 0.05) we generated a list of predicted mRNA targets using the R package miRNAtap. For miRNAs with significantly higher or lower expression in Black tumors compared with White tumors, we respectively combined their mRNA targets and performed KEGG pathway enrichment analysis on the lists of genes using the R package clusterProfiler. Results: From our dataset, we profiled 2051 miRNAs. Unsupervised clustering revealed a subset of 14 miRNAs that were significantly lower in expression in Black LSCCs compared to White LSCCs. KEGG pathway analysis showed that human immunodeficiency virus 1 pathway was significantly enriched for these miRNAs (p &amp;lt; 0.005). The GeneRatio for this pathway is greater than 0.60, indicating that around 60% of all genes in the human immunodeficiency virus 1 pathway are targeted by these lower expressed miRNAs. Significant gene targets identified are those involving the inflammatory signaling pathway including Raf-1, NFκB, and TNFR2. Conversely, we identified 7 miRNAs that were significantly higher in expression in Black LSCC compared to White LSCC. KEGG pathway analysis found the autophagy pathway to be significantly enriched for these miRNAs (p &amp;lt; 0.005). The GeneRatio for this pathway is greater than 0.40, indicating that over 40% of all genes in the autophagy pathway are targeted by these higher expressed miRNAs. Significant gene targets identified are those involved in cell survival signaling pathways including PI3K, AKT, JNK1, and PTEN. Conclusion: In summary, our computational findings highlight differential cell signaling pathways that may play a role in LSCC tumorigenesis in a race-dependent manner. Future directions for this work will involve additional pathway characterization through further computational analyses and biochemical studies. Citation Format: Chayil C. Lattimore, Heather Kates, Tongjun Gu, Jinmai Jiang, Thomas Schmittgen, Kristianna M. Fredenburg. Computational pathway analysis of differentially expressed miRNAs in Black compared with White laryngeal squamous cell carcinoma [abstract]. In: Proceedings of the 15th AACR Conference on the Science of Cancer Health Disparities in Racial/Ethnic Minorities and the Medically Underserved; 2022 Sep 16-19; Philadelphia, PA. Philadelphia (PA): AACR; Cancer Epidemiol Biomarkers Prev 2022;31(1 Suppl):Abstract nr C048.