Ghrelin对胃癌SGC-7901细胞增殖的影响及其作用机制

目的探讨Ghrelin对人胃癌SGC-7901细胞增殖的影响及其作用机制。方法在人胃癌SGC-7901细胞的培养基中添加不同浓度的Ghrelin(400、500、600、700、800 ng/mL),采用MTT法检测细胞增殖情况,实时荧光定量PCR法检测miR-7的表达量,Western blot法检测细胞中Cyclin D1及p27的表达水平。结果 600～800 ng/mL的Ghrelin可显著抑制胃癌SGC-7901细胞的增殖(P 0. 01)。随着600 ng/mL Ghrelin作用时间的延长,miR-7的表达量显著增加(P 0. 01);人胃癌SGC-7901细胞中Cyclin D1的表达显著下调(P 0. 01),p27的表达显著上调(P 0. 05)。结论 Ghrelin可显著抑制胃癌SGC-7901细胞增殖,可能是通过调控Cyclin D1、p27及miR-7的表达来实现的。     

Relationship between Orexigenic Peptide Ghrelin Signal,Gender Difference and Disease

Growth hormone secretagogue receptor 1a (GHS-R1a), which is one of the G protein-coupled receptors (GPCRs), is involved in various physiological actions such as energy consumption, growth hormone secretion promoting action, and cardiovascular protective action. The ligand was searched for as an orphan receptor for a while, but the ligand was found to be acylated ghrelin (ghrelin) discovered by Kangawa and Kojima et al. in 1999. Recently, it has also been reported that dysregulation of GHS-R1a mediates reduced feeding in various diseases. On the other hand, since the physiological effects of ghrelin have been studied exclusively in male mice, few studies have been conducted on gender differences in ghrelin reactivity. In this review, we describe (1) the characteristics of GHS-R1a, (2) the role of ghrelin in hypophagia due to stress or anticancer drugs, and (3) the gender differences in the physiological effects of GHS-R1a and the influence of stress on it.