Expression In Pulp Research Articles

Osmolytes and CsAQP expression jointly influence water physiology in the peel and pulp of orange (Citrus sinensis (L.) Osbeck) fruit during postharvest water loss.

Water loss is a serious issue affecting the quality of postharvest horticultural products. Aquaporins (AQPs) regulate the transport of water across biological membranes, along the gradient of water potential, and may play a role in water loss. In this study, matured orange fruits (Citrus sinensis) stored at ambinent temperature (RH 85-95%) for 105 d showed that the weight loss persistently increased, and its rate peaked at 45-60 d and 90-105 d. Both water content and potential were higher in the pulp than in the peel. Water content rose before 60 d, and peel water potential fell with an increased gradient after 60 d. Comparing with peel, osmolytes such as soluble sugar, sucrose, glucose, fructose, and organic acids showed higher accumulation, and their levels were the lowest around 60 d. In contrast, soluble protein and inorganic minerals showed low levels of accumulation in the pulp. In total, 31 CsAQP genes were expressed in the fruit, and most of them were down-regulated in the peel but up-regulated in the pulp during storage. These genes were subsequently classified into four clusters based on their expression patterns. Genes in Cluster I - including CsNIP1;1/2;1/2;2/2;3/3;1/4;1/6;1, CsTIP1;3/2;2/2;3/5;1/6;1, CsXIP1;1/1;2, CsSIP1;2, and CsPIP1;2 - were persistently up-regulated in the pulp for the 105 d of storage, especially at day 60, when some genes showed 103-fold higher expression. Pearson's correlation and principal component analysis further revealed a significant positive correlation among weight loss rate, water content, and water potential gradient (R2 = 0.85). Indexes positively correlated with osmolyte content and Cluster I gene expression in pulp samples suggest that increased CsAQP gene expression in pulp is linked to faster water loss in oranges, particularly at 60 days postharvest.

Expression of a fibronectin in the dental pulp of lead intoxicated rats with experimentally induced diabetes mellitus

Introduction/Objective. Lead exposure represents one of the most important factors that affect the general health, including oral health and it is associated with enamel and dentin tooth defects. The aim of this paper was to determine expression of the fibronectin in the pulp of rats with experimentally induced diabetes mellitus (DM), after lead exposure, by using immunohistochemical analysis. Methods. The study was conducted on 42 rats of Wistar strain. Intoxication of rats with lead-acetate was done via drinking water ad libitum. The first group (Exp_14) consisted of 16 rats, which received lead in water for 14 days, the second group (Exp_30) consisted of 16 rats which received lead in water for 30 days at the same concentration (1500 ppm), while the control consisted of 10 healthy rats. Groups Exp_14 and Exp_30 were induced into DM, by using the Alloxan intraperitoneally. Pathohistological and immunohistochemical analysis determined fibronectin expression in pulp, odontoblasts, predentin and dentine of the teeth. Results. High diffuse positivity of fibronectin in group Exp_14 was noticed in 63.6% of rats, in group Exp_30 in 24% of rats, while in the control group it was noticed in 50% of rats. There was no statistically significant difference in the expression of fibronectin between the examined groups. Conclusion. Lead intoxication through drinking water, for a period of 14 and 30 days, had effect on the expression of fibronectin in the pulp, odontoblasts, predentin and dentin of the teeth of animals experimentally induced DM.

Genome wide identification of superoxide dismutase (SOD) genes and their expression profiles under 1-methylcyclopropene (1-MCP) treatment during ripening of apple fruit

The objective of this research was to determine the role that ethylene plays in superoxide dismutase (SOD) gene expression of apple fruit (Malus × domestica Borkh.) during ripening. Apple fruit at commercial maturity were treated with ethylene antagonists 1-methylcyclopropene (1-MCP) and stored at shelf temperature of 20 °C. Our data indicated that application of 1-MCP resulted in a reduced rate of softening and a delayed peak of ethylene and respiration. 1-MCP treatment reduced accumulation of superoxide anion (O2−) and hydrogen peroxide (H2O2) in both peel and pulp, enhanced SOD activity in pulp and peel to varying degrees during ripening. Expression of Cu/ZnSOD2, Cu/ZnSOD3, Cu/ZnSOD5, Cu/ZnSOD6, Cu/ZnSOD8, MnSOD2, MnSOD7 and MnSOD9 in pulp was enhanced by treatment with 1-MCP during the early ripening period, and conversely, their expression in pulp was reduced by it during the late ripening period compared to control group. Most SOD genes presented a fluctuating pattern of expression in peel after 1-MCP treatment during ripening. Expression of Cu/ZnSOD10 and MnSOD7 in peel was promoted by 1-MCP treatment during the late ripening period, while expression of MnSOD4 and FeSOD1 in peel was generally enhanced by it during the entire shelf life period compared with controls. Our results suggested that ethylene played a role in regulating SOD genes expression in both pulp and peel of ripening apple fruit.

Metalloproteinase 14 (MMP-14) and hsa-miR-410-3p expression in human inflamed dental pulp and odontoblasts

The objective of this study is to evaluate MMP-14 expression in odontoblasts and in the bulk of dental pulp of teeth with pulpitis; to determine the expression of microRNA-410 (miR-410) in pulp tissue, since sequence analysis suggests that miR-410 has potential binding site on MMP-14’s 3′UTR, and hence, can regulate expression of the latter one. Tissue samples of dental pulp from teeth with pulpitis and healthy (control) were formalin fixed and paraffin embedded (FFPE). Samples were examined using immunohistochemical staining for MMP-14 and the expression of miR-410 was evaluated using qRT-PCR. In both, healthy and inflamed pulp odontoblasts stained more intensively than remaining pulp tissue, but this difference was not statistically significant. More positive staining was observed in inflamed pulps compared to healthy pulps. Expression of miR-410 was found significantly lower in inflamed pulps than in healthy ones. In the two examined zones, odontoblasts and remaining pulp, miR-410 was expressed on a similar level. No statistically significant correlation of miR-410 and MMP-14 expression was found. We showed that inflammation changes the MMP-14 expression in pulp tissue and odontoblasts. This study demonstrates for the first time miR-410 expression in human dental pulp and that expression of this microRNA was downregulated in inflamed dental pulp and odontoblasts.

The regulation of MADS-box gene expression during ripening of banana and their regulatory interaction with ethylene

Six MaMADS-box genes have been cloned from the banana fruit cultivar Grand Nain. The similarity of these genes to tomato LeRIN is low and neither MaMADS2 nor MaMADS1 complement the tomato rin mutation. Nevertheless, the expression patterns, specifically in fruit and the induction during ripening and in response to ethylene and 1-MCP, suggest that some of these genes may participate in ripening. MaMADS1, 2, and 3, are highly expressed in fruit only, while the others are expressed in fruit as well as in other organs. Moreover, the suites of MaMADS-box genes and their temporal expression differ in peel and pulp during ripening. In the pulp, the increase in MaMADS2, 3, 4, and 5 expression preceded an increase in ethylene production, but coincides with the CO2 peak. However, MaMADS1 expression in pulp coincided with ethylene production, but a massive increase in its expression occurred late during ripening, together with a second wave in the expression of MaMADS2, 3, and 4. In the peel, on the other hand, an increase in expression of MaMADS1, 3, and to a lesser degree also of MaMADS4 and 2 coincided with an increase in ethylene production. Except MaMADS3, which was induced by ethylene in pulp and peel, only MaMADS4, and 5 in pulp and MaMADS1 in peel were induced by ethylene. 1-MCP applied at the onset of the increase in ethylene production, increased the levels of MaMADS4 and MaMADS1 in pulp, while it decreased MaMADS1, 3, 4, and 5 in peel, suggesting that MaMADS4 and MaMADS1 are negatively controlled by ethylene at the onset of ethylene production only in pulp. Only MaMADS2 is neither induced by ethylene nor by 1-MCP, and it is expressed mainly in pulp. Our results suggest that two independent ripening programs are employed in pulp and peel which involve the activation of mainly MaMADS2, 4, and 5 and later on also MaMADS1 in pulp, and mainly MaMADS1, and 3 in peel. Hence, our results are consistent with MaMADS2, a SEP3 homologue, acting in the pulp upstream of the increase in ethylene production similarly to LeMADS-RIN.

The Effect of Cavity Preparation on Substance P Expression in Human Dental Pulp

Abstract Substance P (SP) plays an important role during neurogenic inflammation of dental pulp. The purpose of this study was to use a radioimmunoassay for determining the effect of cavity preparation on SP expression in healthy human dental pulp. Ten pulp samples were obtained from healthy premolars where extraction was indicated for orthodontic reasons. Deep cavity preparation (<1 mm remaining dentine thickness) was performed before extraction in five of these bicuspids. All samples were processed and 125I-SP labeled; SP was quantified by competition assay. The results revealed SP expression in all human pulp samples. Mann-Whitney’s U test revealed statistically significant higher expression in pulp from teeth where cavity preparation had been performed compared to control values (p < 0.05). These findings suggest that SP is released during common dental procedures (such as cavity preparation) and its expression may have an important clinical significance in terms of experiencing inflammation and pain.

Upregulation of tissue‐type plasminogen activator in inflamed human dental pulps

To compare tissue-type plasminogen activator (t-PA) expression in normal human pulp and inflamed human pulp tissue specimens. Thirty pulpal tissue specimens (13 normal and 17 inflamed pulps) were obtained from extracted third molars. The levels of t-PA between normal pulp and inflamed pulp tissues were compared using the quantitative reverse-transcriptase polymerase chain reaction analysis. In addition, immunohistochemistry was used to identify the in situ localization of t-PA expression in pulp specimens. Wilcoxon-Mann-Whitney rank sum test was applied for the statistical analysis of the results. t-PA mRNA gene was found more in inflamed pulps when compared with normal pulp tissue (P<0.05). The results from immunohistochemistry demonstrated that t-PA expression was significantly higher in the inflamed pulp (P=0.025). t-PA stain was detected in the fibroblasts, inflammatory infiltrates and endothelial cells. t-PA expression was significantly higher in inflamed pulp tissue. t-PA may play an important role in the pathogenesis of pulpal inflammation.

Induction of Vascular Endothelial Growth Factor Gene Expression by Proinflammatory Cytokines in Human Pulp and Gingival Fibroblasts

Vascular endothelial growth factor (VEGF) enhances the permeability of blood vessels, which is an important vascular change observed during inflammatory processes. The purpose of this in vitro study was to investigate the effect of proinflammatory cytokines on the expression of VEGF mRNA gene in human pulp and gingival fibroblasts. Interlukin-1alpha (IL-1alpha) and tumor necrosis factor-alpha (TNF-alpha) were used to evaluate VEGF mRNA gene expression in human pulp and gingival fibroblasts. The levels of mRNAs were measured by quantitative reverse-transcriptase polymerase chain reaction analysis. Both IL-1alpha and TNF-alpha induced significantly high levels of VEGF mRNA gene expression in human pulp and gingival fibroblasts (p < 0.05). In addition, TNF-alpha was found to be more effective in the induction of VEGF mRNA gene expression in pulp than gingival fibroblasts (p < 0.05). Moreover, IL-1alpha was found to be more effective in the induction of VEGF mRNA gene expression than TNF-alpha in gingival fibroblast cultures (p < 0.05). These results indicate that proinflammatory cytokines can induce VEGF mRNA gene expression, and such an effect may partially contribute to the destruction of pulpal and periapical tissues through promoting expansion of the vascular network coincident to progression of the inflammation.