Glucagon-like peptide-1 receptor agonists treat type 2 diabetes mellitus (T2DM), obesity and related comorbidities. Generic liraglutide recently became available, increasing its accessibility. While effective for weight and glycaemic control, its impact (magnitude, timing and regional patterns) on body composition remains uncertain. This exploratory study investigated short-term effects of liraglutide on metabolic parameters, detailed body composition, and myostatin-activin-follistatin-IGF-1 (MAFI) axis components in individuals with T2DM. In this randomized, double-blind, placebo-controlled, crossover trial, 20 adults with T2DM received liraglutide (up to 1.8 mg/day) or placebo for 18 days, separated by a washout period. Dual-energy X-ray absorptiometry assessed regional fat, lean, and bone compartments. Circulating C-peptide and MAFI components were measured by enzyme-linked immunosorbent assay. Outcomes were analyzed using linear mixed models with fixed effects for sequence, as well as time, treatment, and interactions. Liraglutide reduced total body mass (time × treatment p = 0.04) and lowered absolute and percent android fat (time × treatment p = 0.01 and 0.04), as well as trunk fat mass (time × treatment p = 0.04), with no changes in lean or bone compartments over 18 days. In the liraglutide group, C-peptide decreased while total IGF-1 modestly increased (time × treatment p = 0.026 and 0.002, respectively), with no treatment effects on other MAFI components. Short-term liraglutide reduced total body mass and regional trunk and android fat while also improving glycaemia, with no measurable effects on lean or bone tissue. Selective effects on hormones were observed, though their biological plausibility and clinical relevance as compensatory changes maintaining nonfat mass require further investigation. These findings provide early insights into initial responses to liraglutide therapy. Longer studies should assess whether sustained treatment modifies total and lean mass as well as endocrine regulators of muscle preservation.

Acute High Intraocular Pressure Induced by Vitreous Cavity Infusion: an animal model to evaluate corneal endothelial injuries.

Microbial competition drives rapid adaptation, often forcing organisms to specialize in new ecological niches. Adaptations that improve competitive ability can reduce performance in other environments creating trade-offs. Whether such trade-offs persist in nature—or are eroded as lineages adapt through compensatory changes—remains largely unknown. Here we show that a trade-off between competitive ability and host colonization has been stably maintained in naturalPseudomonaspopulations for centuries. Wild plant-pathogenicPseudomonascompete using tailocins—phage-derived molecular weapons that bind to specific cell-surface receptors. Genomic surveys and functional assays reveal that the most broadly lethal tailocins remain rare—while the tailocin’s production increases competitive killing, it also compromises plant colonization. We determine that the polymorphisms behind this tradeoff are not transient — historical genomes spanning two centuries show that the tradeoff has been maintained for at least 10⁵–10⁶ generations. Our results demonstrate that, in natural populations, a tradeoff between competition and pathogenicity is fundamental and not easily overcome.

Crocodilian cardiac anatomy is characterized by a 4-chambered heart with complete septal division of ventricles, with the pulmonary artery and systemic left aorta (LAo) originating from the right ventricle (RV). This morphology allows for right-to-left (R-L) cardiac shunting, in which a fraction of oxygen-poor blood can be recirculated from the RV to the systemic circulation through the LAo, bypassing the pulmonary circulation. The R-L shunt can be eliminated through surgical occlusion of the LAo, which permits investigation into its physiological and adaptive significance. Since the LAo delivers blood to the gut, it has been suggested that desaturated blood supplied by R-L shunting delivers higher levels of CO2 and H+, ultimately increasing gastric acid secretion and facilitating digestion. Consequently, we hypothesized that chronic surgical occlusion would negatively impact digestive performance of lab-raised American alligators (Alligator mississippiensis). In this study, two groups of alligators (9 years old; 7 years post operation) with and without the capacity for R-L shunting (recipients of sham surgery or surgery to occlude LAo, respectively) were fed rodent meals of known mass and energy content to investigate digestive performance. There were no differences in apparent digestive efficiency or transit time between groups. We demonstrated that there were no underlying compensatory changes in mass or length of digestive or accessory digestive organs and no change in relative surface area or digestive enzyme activity in any intestinal region. Surgical elimination of R-L cardiac shunt did not affect digestion in alligators, refuting the hypothesis that the R-L shunt is advantageous for crocodilian digestion.

Background: Principal strain (PS) analysis offers a novel approach for evaluating the three-dimensional deformation of the left ventricle (LV) using 3D speckle-tracking echocardiography (STE). Unlike traditional 2D-strain measurements that focus only on the magnitude of deformation along a single axis, PS analysis quantifies both the magnitude and the angle of deformation, providing information on the directionality of myocardial fiber contraction. We applied PS in a cohort of Duchenne muscular dystrophy (DMD) patients with preserved EF (>50%) and mildly reduced LV EF (>41-49%). Hypothesis: PS angle may reveal changes in LV fiber orientation that may serve as a compensatory mechanism before the progression of cardiomyopathy in DMD patients. Methods: This is a cross-sectional study involving 54 genetically confirmed DMD patients with no cardiac symptoms. The age range was 3 to 19 years (median age 10.3 years ± 4.4). We studied 53 age-matched healthy male controls (12 years ± 4.3). The magnitude and direction of 3D global PS (GPS), 3D global longitudinal strain (GLS), and 3D global circumferential strain (GCS) were calculated. We compared the magnitude of 3D strains and PS angles between DMD and controls, and assessed relationships between 3D EF and GLS, GPS, and PS angles in DMD subjects. Results: In the DMD group, magnitudes of GPS and GLS were reduced compared to controls (Table 1). PS angles in all four walls (anterior, posterior, lateral, septal) had a more horizontal orientation compared to controls (Figure 1 and Table 1). GPS had the strongest correlation with EF (r= 0.91, p value < 0.001, Figure 2). Comparatively, GLS showed a weaker correlation with EF (r= 0.46, p<0.001, Figure 2). Global PS angle had a moderately strong inverse correlation with EF (r= -0.69, P < 0.001, Figure 2). Conclusion: Principal strain analysis using 3D STE reveals alterations in myocardial fiber orientation in DMD patients, characterized by a more horizontal deformation pattern. Within the constraints of a cross-sectional study design, we speculate that these directional alterations in myofiber contraction may represent compensatory changes in the LV to preserve cardiac output, as evidenced by a moderately strong correlation between the PS angle and EF. These adaptations occur before progression to clinically significant cardiomyopathy. This technique may offer a valuable, noninvasive tool for early detection and monitoring of cardiac involvement in DMD patients.

Assess the relationship between change in L4-5 segmental lordosis (SL) and its effect on clinical and radiographic parameters after lateral lumbar interbody fusion (LLIF) at L4-5. Clinical scores and radiographic measurements were collected for patients who underwent single-level LLIF at L4-5 at a local institution between 2017 and 2022. Linear regression analysis was performed for changes in clinical and radiographic parameters as a function of change in SL. Ninety-four patients were included in the analysis. Significant preoperative to postoperative increases occurred in L4-5 SL (P < 0.001), L2-3 SL (P = 0.04), anterior disc height (P < 0.001), posterior disc height (P < 0.001), neural foraminal height (P < 0.001), and T1-pelvic angle (P = 0.03). Significant decreases occurred postoperatively in L5-S1 SL (P < 0.001) and spondylolisthesis length (P < 0.001). Change in L4-5 SL was positively correlated with Δ lumbar lordosis (LL; P = 0.001), Δ distal LL (P < 0.001), Δ anterior disc height (P < 0.001), and Δ T5-T12 kyphosis (P = 0.04). Change in L4-5 SL was negatively correlated with Δ pelvic incidence-LL mismatch (P = 0.001) and Δ L5-S1 SL (P = 0.01). LLIF at L4-5 induced greater L4-5 SL; this change was positively associated with changes in LL, distal LL, anterior disc height, and T5-T12 kyphosis, and negatively associated with changes in pelvic incidence-LL mismatch and L5-S1 SL. Potential compensatory changes proximal and distal to the LLIF level may depend on the amount of SL achieved at the operative level.

Adaptive hematological profiles and brain structure buffer depression in high-altitude healthy adults.

PurposeTo determine whether localized retinal exposure to astigmatic blur is sufficient to drive compensatory changes in refractive and corneal astigmatism in developing chick eyes.MethodsOne hundred and thirty-six chicks were randomly assigned to nine groups combining three visual field conditions (full, horizontal, or vertical) and three lens treatments: with-the-rule (WTR) astigmatism (+2.00/−4.00 × 90), against-the-rule (ATR) astigmatism (+2.00/−4.00 × 180), or control (plano lens). Objective refraction and A-scan ultrasonography were measured at baseline (post-hatch day 5) and after 7 days of lens treatment, at which time corneal topography was also assessed. Data were analyzed using interocular differences (treated right eye minus untreated left eye) with two-way ANOVA.ResultsExposure to astigmatic blur induced significant compensatory changes in both refractive and corneal astigmatism, regardless of visual field extent. WTR blur elicited greater compensatory astigmatism than ATR blur (mean difference = 1.20 ± 0.16 DC, P < 0.001), with both conditions showing significant compensation compared to controls (P < 0.001). Visual field condition had no significant effect on astigmatic compensation (P ≥ 0.19). In contrast, spherical ametropia development was influenced by visual field exposure, with partial-field conditions inducing mild myopic shifts and deeper anterior chambers compared to full-field exposure (P < 0.001).ConclusionsLocalized retinal exposure to astigmatic blur is sufficient to drive compensatory changes in both refractive and corneal astigmatism, indicating that local retinal mechanisms can independently guide astigmatism compensation. In contrast, spherical refractive development appears to be modulated by the extent of visual field exposure.

Abnormal diffusion tensor imaging (DTI) metrics have been reported both near and distant from non-hemorrhagic punctate white matter lesions, suggesting abnormal brain connectivity. To evaluate the effect of non-hemorrhagic punctate white matter lesions on both structural and functional brain connectivity in preterm infants. DTI and resting-state functional magnetic resonance imaging (rs-fMRI) data acquired around term-equivalent age were analyzed using graph theory in nine preterm infants with non-hemorrhagic punctate white matter lesions (gestational age: mean±SD, 31.5 weeks±2.5weeks) and nine gestational age-matched controls (mean, 31.4 weeks±2.5weeks). Both groups exhibited modularity, small-world topology, and rich-club organization. Compared with controls, infants with non-hemorrhagic punctate white matter lesions showed increased diffusion efficiency (0.0098±0.0003 vs. 0.0093±0.0003, P=0.03) in functional connectivity. In structural connectivity, the non-hemorrhagic punctate white matter lesions group demonstrated (a) increased betweenness centrality in the opercular part of the right inferior frontal gyrus (227.3±93.9 vs. 164.9±3.2, P<0.01); (b) increased characteristic path length in the left superior parietal lobe (48.7±3.1 vs. 46.9±3.1, P<0.01), left inferior parietal lobe (53.0±3.3 vs. 50.8±3.5, P<0.01), and right angular gyrus (61.1±4.3 vs. 55.8±4.3, P<0.01); and (c) increased participation coefficient in the inferior temporal gyrus (0.14±0.20 vs. 0.03±0.09, P<0.01). In preterm infants, non-hemorrhagic punctate white matter lesions appear to disrupt modularity in functional networks and structural connectivity in the dorsal visual stream, with compensatory changes in the ventral stream. They are also associated with increased structural connectivity in regions linked to risk aversion.

C-C chemokine receptor (CCR) 3 deficiency disrupts chemokine receptor expression in bone marrow-derived macrophages and osteoclast precursors.

Previous research has shown that predictive models can optimize surgical planning. This study investigates whether predictive models can be used to accurately predict compensatory changes in sagittal spinopelvic parameters after all-posterior spinal fusion (PSF) in patients with adolescent idiopathic scoliosis (AIS). Retrospective analysis ofmedical records was performed to identify pediatric patients with Lenke class 1-4 AIS who underwent PSF with implantation of patient-specific rods (PSR) during the period from July 2018 to December 2020. All included patients (n = 34) were followed for at least two years. Surgical strategies were simulated on preoperative radiographs to achieve desired thoracic kyphosis (TK) for sagittal planning. Previously validated predictive models were used to predict postoperative lumbar lordosis (LL) and pelvic tilt (PT). Pre-contoured patient specific titanium rods were utilized during corrective surgery. Standard radiographic measurements were obtained preoperatively, along with one and two years postoperatively. At 2-year follow-up, in the overall cohort, median TK gain was 9.3° vs. preoperative [IQR: -1.9, 20.5] (p = .003) and 4.9° vs. planned [- 1.6, 10.8] (p < .001). Median differences of postoperative vs. predicted in LL and PT were - 3.8° [IQR: - 10.4, 1.4] (p = .006) and - 0.1° [IQR: - 3.7, 3.3] (p = .555), respectively. At 2-year follow-up in the hypokyphotic subgroup (TK < 20°) (n = 12), median TK gain was 22.4° vs. preoperative [IQR: 15.6, 21.2] (p = .002) and 2.1° vs. planned [IQR: - 2.1, 8.1] (p = .239). Median differences of postoperative vs. predicted in LL and PT were - 3.4 [- 9.7, 0.4] (p = .083) and 0.5 [IQR: - 2.0, 2.7] (p = .262), respectively. The predictive models accurately predicted compensatory changes in the spinopelvic parameters of unfused segments after AIS surgery in the hypokyphotic subset of patients up to two years post op, and up to one year post-operatively in our entire cohort.

Regulated proteolysis via autophagy is essential for cellular homeostasis, yet the specific role of autophagy-related gene 7 (ATG7) in corneal epithelial maintenance remains unclear. Using a conditional knockout mouse model (Atg7f/f K14Cre+/−), we investigated the impact of ATG7 deficiency on corneal epithelial autophagy, morphology, and vascular dynamics. Loss of ATG7 disrupted autophagosome formation, evidenced by increased LC3B expression but reduced LC3B-positive puncta and absence of autophagosomes ultrastructurally. Although gross corneal morphology was preserved, ATG7 deficiency led to thickened epithelium and increased peripheral lymphatic vessel sprouting, indicating a pro-inflammatory and pro-lymphangiogenic microenvironment. Proteomic analysis revealed upregulation of RAB8, TM9S3, and RETR3, suggesting activation of compensatory pathways such as exophagy, reticulophagy, and Golgiphagy. Inflammatory and angiogenic components were downregulated, suggesting a moderate loss of inhibitory capacity based on the lymphatic phenotypes observed. At the same time, while these two compensatory changes occur, other proteins that positively regulate lysosome formation are reduced, resulting in a phenotype linked to deficient autophagy. These findings demonstrate that ATG7-mediated autophagy maintains corneal epithelial homeostasis and immune privilege, with implications for understanding corneal inflammation and lymphangiogenesis in ocular surface diseases.

Lower extremity length discrepancy (LELD) is closely associated with spinal imbalances such as pelvic tilt and functional scoliosis. While existing studies have focused on LELD-induced coronal compensations, its impact on sagittal spinal balance remains poorly understood. The aim of the current study was to investigate the differential effects of LELD on coronal and sagittal spinal balance in adolescents with functional versus structural scoliosis. A retrospective analysis of 211 patients was conducted. Participants were stratified into functional (n=165) or structural scoliosis (n=46) groups based on pelvic and lumbar correction with limb elevation. Radiographic parameters included coronal and sagittal measures. Statistical analyses compared groups and assessed correlations. Structural scoliosis exhibited significantly worse coronal imbalance (higher sacral obliquity, lumbar Cobb angle, and coronal balance distance; P<0.001) and greater sagittal vertical axis (SVA; P<0.05). LELD correlated with coronal parameters in functional scoliosis (P<0.05) but not structural cases. Sagittal balance parameters (pelvic tilt, sacral slope) showed no LELD association, though SVA correlated with coronal imbalance only in functional scoliosis (P<0.05). Roussouly's sagittal classification did not differ between groups. LELD primarily drives compensatory coronal changes, with minimal sagittal impact. Structural scoliosis demonstrates worse coronal imbalance and elevated SVA, suggesting distinct compensatory mechanisms. Functional cases may benefit from LELD correction, while structural scoliosis requires sagittal evaluation during surgical planning. These findings highlight the importance of prioritizing coronal alignment in LELD-related scoliosis management. Level III.

Mild levels of stress may lead to compensatory changes in perceptual strategies, especially during social affective stroking. We recruited 17 healthy adults with moderate levels of psychological stress, as assessed by the PSM-25 questionnaire and clinical interviews, and 17 participants with low levels of stress. Tactile stimulation involved slow gentle stroking by the researcher's hand of two areas: the foot and the shin. We analyzed the regions of interest signal by examining all activated clusters in 34 participants and also analyzed group-specific BOLD signals. Our findings suggest an increased sensitivity to social tactile stroking in stressed individuals, which correlated with increased activity in areas related to tactile perception, including the left parietal and central operculum, as well as the left precentral gyrus. Additionally, we observed activation in brain regions involved in inhibitory control and theory of mind, such as the left caudate nucleus, left middle cingulate cortex, left anterior insula, and left superior temporal gyrus. Sex differences were also noted: compared to women, men showed higher activation in the middle occipital gyrus, superior parietal lobe and left middle frontal gyrus. This study sets the stage for future research into perceptual strategies and their biochemical correlates in highly stressed or distressed participants.

Dendritic retraction contributes to spine density recovery following denervation in vitro.

Preoperative and postoperative joint motion in chihuahuas with Grade III medial patellar luxation: A kinematic and goniometric analysis.

AI-informed retinal biomarkers predict 10-year risk of onset of multiple hematological malignancies.

Abstract Gear and catch diversification can provide natural insurance to fishers by stabilising catch rates, thanks to the differential response of fish species to varying environmental conditions. The effectiveness of diversification, however, may be diminished if there is a threshold above which compensatory changes are weakened and species abundance tends to move in the same direction. We analyse this hypothesis using data from an open-access artisanal fishery in an estuarine ecosystem, located in a Colombian Biosphere. Reserve. We find evidence of a threshold in salinity levels in the 25–30 g kg−1 range for most gears employed in the fishery. Below the threshold, catch diversification stabilises the mean catch rate, but above it, catch rates decline. The evidence of a threshold defining a high salinity conditions regime calls for the adoption of adaptive fishery management strategies, as well as social protection mechanisms for vulnerable fishers.

Purpose: Emmetropization is significantly influenced by compensatory changes between the corneal curvature and axial length. Refractive status of the eye depends on the balance between several variables, including corneal power, lens power, and axial length. The goal of this study was to determine the relationship between axial length, keratometry values and IOL power in subjects with cataract. Methods: The study participants were 100 cataract subjects scheduled for surgery at St. Teresa Specialist and Laser Eye Centre in Benin City, Nigeria. The axial length, keratometry values, and IOL power were measured using the Amplitude Scan ultrasound biometry (A-Scan), Automated keratometry, and IOL formula software respectively. Results: There was no statistically significant difference in the mean keratometric values, axial length and IOL powers among the males and the females. A strong inverse correlation was seen between axial length and keratometric values in both meridians with r = -0.569 for K1 and r = -0.508 for K2, which was statistically significant (p &lt; 0.001 in both). Hence, axial length increases as keratometric values (k1 &amp; k2) decrease. A statistically significant strong inverse correlation was also found between axial length and IOL power (r = -0.805, p &lt; 0.001). This implied that as axial length increases, IOL power required decreases. A weak positive correlation between IOL powers and the keratometric values was observed (r = 0.089, p= 0.381) which was not statistically significant. Conclusion: Our findings showed that axial length has a strong inverse correlation with corneal curvature and IOL power, while the positive co-relationship of corneal curvature with IOL power was weak.

IntroductionThe posterior tail of the striatum receives dense inputs from sensory regions of cortex and thalamus, as well as midbrain dopaminergic innervation, providing a neural substrate for associative sensory learning. Previously, we have demonstrated that developmental hearing loss is associated with aberrant physiological states in striatal medium spiny neurons (MSNs).MethodsHere we directly investigated auditory associative learning impairments in the striatum of adult Mongolian gerbils that underwent transient developmental hearing loss or sham hearing loss during the critical period of auditory development. We used electrophysiology to reveal significant changes to neuronal population responses in vivo and intrinsic and synaptic properties to medium spiny neurons in vitro as animals learned an appetitive “Go/No-Go” auditory discrimination task. For in vivo experiments a 64-channel electrode was implanted in the auditory region of the posterior tail of the striatum and neuronal recordings were carried out as animals learned the task. For in vitro experiments, corticostriatal slice preparations were made from animals on each day of training.ResultsIn naïve animals from both groups there was limited to no phase locking to either auditory stimulus in vivo, and long term depression resulted from theta burst stimulation in vitro. Furthermore, intrinsic and synaptic properties in normal hearing animals were unaffected; however, the hearing loss group continued to show lowered synaptic inhibition, synaptic hyperexcitation, and suppressed intrinsic excitability in the hearing loss group. Starting around day 3–4 in both groups, the emergence of striatal medium spiny neuron phase locking to the auditory conditioning stimuli was observed in vivo. This occurred contemporaneous to an increased probability of theta burst induced LTP during MSN whole cell recording in vitro, and acquisition of the task as the correct rejection response significantly increased in the behaving animals. During the acquisition phase MSNs in the normal hearing group showed a significant decrease in synaptic inhibition and increase in synaptic excitation with no change to intrinsic excitability, while the MSNs in the hearing loss group showed a significant increase in synaptic inhibition, reduction of synaptic hyper excitability, and compensatory changes to intrinsic excitability that supported normal action potential generation. In both groups, synaptic properties were resolved to similar level of E/I balance that could be part of a conserved learning state.DiscussionThese changes to the intrinsic and synaptic properties likely support LTP induction in vivo and the strengthening of synapses between auditory inputs and MSNs that facilitate neuronal phase locking. These findings have significant implications for our understanding of striatal resilience to sensory impairments in early life, in addition to establishing a granular understanding of the striatal circuit changes that support reward driven stimulus–response learning.