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In vivo effects of thyroid honnone, corticosteroids and prolactin on cell proliferation and apoptosis in the anterior intestine of the euryhaline mudskipper (Periophthalmus modestus)

机译:甲状腺激素,皮质类固醇和催乳激素对euryhaline sk鱼(Periophthalmusmodetus)前肠细胞增殖和凋亡的影响

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We have previously shown that anterior intestinal epithelium of the euryhaline mudskipper (Periophthalmus modestus) undergoes apoptosis during seawater (SW) acclimation, whereas elevated cell proliferation was observed in freshwater (FW)-acclimated fish. To understand the possible endocrine regulation of the gastrointestinal cell turnover during salinity acclimation, we examined the ratios of apoptotic and proliferating cells in the anterior intestine of one-third SW-acclimated mudskipper treated with triiodothyronine (T-3) cortisol, 11-deoxycorticosterone (DOC, the putative teleostean mineralocorticoid), or prolactin (PRL). In situ nick end labeling of genomic DNA (TUNEL) and immunohistochemistry of proliferating cells nuclear antigen (PCNA) were used as indicators of apoptosis and cell proliferations, respectively. Cortisol significantly elevated apoptosis (P < 0.05) in the epithelia and connective tissues and also stimulated the epithelial cell proliferation (P < 0.05). PRL induced epithelial cell proliferation (P < 0.05), but did not affect apoptotic status of the intestinal epithelium. Neither T-3 nor DOC had any impact on cell proliferation or apoptosis. Together, our results suggest a role for cortisol and PRL in the regulation of anterior intestinal epithelial turnover during salinity acclimation in this species. (c) 2006 Elsevier Inc. All rights reserved.
机译:先前我们已经表明,在海水(SW)适应过程中,欧洲鱼腥草ipper鱼(Periophthalmusmodetus)的前肠上皮会发生凋亡,而在适应淡水(FW)的鱼中观察到细胞增殖升高。为了了解盐度适应过程中胃肠道细胞更新的可能的内分泌调节,我们检查了用三碘甲甲状腺素(T-3)皮质醇,11-脱氧皮质酮处理的三分之一经SW适应的泥sk的前肠中凋亡细胞和增殖细胞的比率。 DOC(推定的硬骨盐皮质激素)或催乳素(PRL)。基因组DNA的原位切口末端标记(TUNEL)和增殖细胞的免疫组织化学核抗原(PCNA)分别用作细胞凋亡和细胞增殖的指标。皮质醇显着提高了上皮和结缔组织的凋亡(P <0.05),并且还刺激了上皮细胞的增殖(P <0.05)。 PRL诱导上皮细胞增殖(P <0.05),但不影响肠道上皮的凋亡状态。 T-3和DOC都不会对细胞增殖或凋亡产生任何影响。在一起,我们的结果表明,在该物种的盐度适应过程中,皮质醇和PRL在调节前肠上皮周转中起作用。 (c)2006 Elsevier Inc.保留所有权利。

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