BACKGROUNDGhrelin is an adipokine that plays an important role in energy balance. Expressionof ghrelin and ghrelin receptor has been investigated in different tissues andtumors. Studies regarding expression of ghrelin...BACKGROUNDGhrelin is an adipokine that plays an important role in energy balance. Expressionof ghrelin and ghrelin receptor has been investigated in different tissues andtumors. Studies regarding expression of ghrelin and ghrelin receptor in colorectaltumors are scarce and no data on expression of ghrelin and its receptor incolorectal adenomas has been published. Ghrelin and ghrelin receptor werehighly expressed in colon carcinoma cells while expression was decreased in lessdifferentiated tumors, presuming that ghrelin might be important in early phasesof tumorigenesis.AIMTo investigate the expression of ghrelin and ghrelin receptor in human colorectaladenomas and adjacent colorectal tissue.METHODSIn this prospective study (conducted from June 2015 until May 2019) we included92 patients (64 male and 28 female) who underwent polypectomy for colorectaladenomas in the Department of Gastroenterology and Hepatology, “Sestre milosrdnice” Clinical Hospital Center in Zagreb, Croatia. After endoscopicremoval of colorectal adenoma, an additional sample of colon mucosa in theproximity of the adenoma was collected for pathohistological analysis. Adenomaswere graded according to the stage of dysplasia, and ghrelin and ghrelin receptorexpression were determined immunohistochemically in both adenoma andadjacent colon tissue using the polyclonal antibody for ghrelin (ab150514,ABCAM Inc, Cambridge, United States) and ghrelin receptor (ab48285, ABCAMInc, Cambridge, United States). Categorical and nominal variables were describedthrough frequencies and proportions and the difference between specific groupswere analyzed with Fisher’s and Fisher-Freeman-Halton’s method respectively.Spearman's rank correlation coefficient was determined for correlation ofexpression of ghrelin and ghrelin receptor in adenoma and adjacent colon tissuewith the grade of adenoma dysplasia.RESULTSAmong 92 patients with colorectal adenoma 43 had adenomas with high-gradedysplasia (46.7%). High expression of ghrelin was 7 times more common in highgradeadenoma compared to low-grade adenomas (13.95% to 2.04%, P = 0.048),while the expression of ghrelin in adjacent colon tissue was low. We found nocorrelation between ghrelin receptor expression in adenoma and adjacent colontissue and the grade of colorectal adenoma dysplasia. The most significantcorrelation was found between ghrelin and ghrelin receptor expression inadenomas with high-grade dysplasia (rho = 0.519, P < 0.001).CONCLUSIONGhrelin and ghrelin receptor are expressed in colorectal adenoma and adjacenttissue with ghrelin expression being more pronounced in high grade dysplasia asa possible consequence of increased local synthesis.展开更多
Background The ghrelin plays an important role in the regulation of food intake and energy homeostasis. Therefore, the ghrelin receptor gene （GHSR） is an excellent candidate for studying metabolic syndrome. This stu...Background The ghrelin plays an important role in the regulation of food intake and energy homeostasis. Therefore, the ghrelin receptor gene （GHSR） is an excellent candidate for studying metabolic syndrome. This study aimed to investigate whether polymorphisms in ghrelin receptor gene are associated with metabolic syndrome in Chinese population. Methods Subjects consisted of 698 patients aged 41 to 80 years, diagnosed as metabolic syndrome by International Diabetes Federation （IDF） 2005 criteria, and 762 age- and gender-matched controls. Three variants within the GHSR were selected and genotyped using polymerase chain reaction （PCR） and restriction fragment length polymorphism （RFLP）. Odds ratios were estimated using a case-control study design by controlling confounding factors. Results The NA genotype （rs2922126） in the promoter was associated with metabolic syndrome （OR 1.41, 95%C/ 1.03-1.94）, increased waist circumference （OR 1.75, 95%C/1.26-2.42）, and increased fast blood glucose （OR 1.49, 95%CI 1.07-2.06） in women. The NA genotype （rs509030） in the intron was associated with lower plasma high density lipoprotein in women （OR 1.37, 95%C/1.02-1.84）. Conclusion The polymorphisms within GHSR might be a genetic risk factor for metabolic syndrome in women.展开更多
Ghrelin, a brain-gut peptide that induces anxiety and other abnormal emotions, contributes to the effects of insomnia on emotional behavior. In contrast, the traditional Chinese Medi- cine remedy Wen Dan Tang reduces ...Ghrelin, a brain-gut peptide that induces anxiety and other abnormal emotions, contributes to the effects of insomnia on emotional behavior. In contrast, the traditional Chinese Medi- cine remedy Wen Dan Tang reduces insomnia-related anxiety, which may perhaps correspond to changes in the brain-gut axis. This suggests a possible relationship between Wen Dan Tan^s pharmacological mechanism and the brain-gut axis. Based on this hypothesis, a sleep-deprived rat model was induced and Wen Dan Tang was administered using oral gavage during model es- tablishment. Wen Dan Tang significantly reduced insomnia-related anxiety and prevented Ghrelin level decreases following sleep deprivation, especially in the hypothalamus. Increased expression of Ghrelin receptor mRNA in the hypothalamus was also observed, suggesting that reduced anxi- ety may be a result of Wen Dan Tan＇s regulation of Ghrelin-Ghrelin receptors.展开更多
Obe statin与Ghrelin是两种重要的脑肠肽(brain-gut peptide,BGP),与其受体结合后发挥重要的生物学功能.Obestatin位于胃生长素前体原的76-98片段,可以结合孤儿G蛋白GPR39受体,抑制食物摄取、空肠的蠕动和体质量的增加.而Ghrelin则位于...Obe statin与Ghrelin是两种重要的脑肠肽(brain-gut peptide,BGP),与其受体结合后发挥重要的生物学功能.Obestatin位于胃生长素前体原的76-98片段,可以结合孤儿G蛋白GPR39受体,抑制食物摄取、空肠的蠕动和体质量的增加.而Ghrelin则位于胃生长素前体原的24-51肽段,可以结合蛋白受体GHS-R,增加食欲和体质量,促进GH的释放,影响心血管功能和免疫机能等.Obestatin被认为是Ghrelin的生物学拮抗剂或阴阳活性多肽.展开更多
目的:探讨ghrelin对糖尿病小鼠胃排空的影响及其作用机制.方法:采用四氧嘧啶建立糖尿病小鼠模型,用灌食phenol red的方法研究糖尿病小鼠胃排空的改变,并观察注射不同剂量ghrelin(50,100和200μg/kg)对糖尿病小鼠胃动力的影响.糖尿病小...目的:探讨ghrelin对糖尿病小鼠胃排空的影响及其作用机制.方法:采用四氧嘧啶建立糖尿病小鼠模型,用灌食phenol red的方法研究糖尿病小鼠胃排空的改变,并观察注射不同剂量ghrelin(50,100和200μg/kg)对糖尿病小鼠胃动力的影响.糖尿病小鼠胃底环形平滑肌条安置在恒温灌流肌槽中并用SMUP-E生物信号处理系统记录肌条的自发收缩活动,观察不同浓度ghrelin(0.1,1和10μmol/L)对肌条自发收缩活动的影响,并研究其作用机制.结果:糖尿病小鼠的胃排空率显著低于正常小鼠的胃排空率(22.90%±1.42% vs 28.10%±1.28%,P<0.05).ghrelin能显著提高糖尿病小鼠的胃排空,具有明显的量效关系.Ghrelin在0.1,1和10μmol/L均能显著增加糖尿病小鼠离体胃底环形平滑肌肌条的自发收缩幅度(1.11±0.03,1.22±0.02,1.36±0.04 vs 1.00,均P<0.05),而atropine和L-NAME均能抑制ghrelin增加糖尿病小鼠肌条自发收缩幅度的效应.结论:Ghrelin能提高糖尿病小鼠的胃排空能力,作用机制可能是通过肌间丛神经系统的硝基能神经和胆碱能神经上的受体而起作用.展开更多
文摘BACKGROUNDGhrelin is an adipokine that plays an important role in energy balance. Expressionof ghrelin and ghrelin receptor has been investigated in different tissues andtumors. Studies regarding expression of ghrelin and ghrelin receptor in colorectaltumors are scarce and no data on expression of ghrelin and its receptor incolorectal adenomas has been published. Ghrelin and ghrelin receptor werehighly expressed in colon carcinoma cells while expression was decreased in lessdifferentiated tumors, presuming that ghrelin might be important in early phasesof tumorigenesis.AIMTo investigate the expression of ghrelin and ghrelin receptor in human colorectaladenomas and adjacent colorectal tissue.METHODSIn this prospective study (conducted from June 2015 until May 2019) we included92 patients (64 male and 28 female) who underwent polypectomy for colorectaladenomas in the Department of Gastroenterology and Hepatology, “Sestre milosrdnice” Clinical Hospital Center in Zagreb, Croatia. After endoscopicremoval of colorectal adenoma, an additional sample of colon mucosa in theproximity of the adenoma was collected for pathohistological analysis. Adenomaswere graded according to the stage of dysplasia, and ghrelin and ghrelin receptorexpression were determined immunohistochemically in both adenoma andadjacent colon tissue using the polyclonal antibody for ghrelin (ab150514,ABCAM Inc, Cambridge, United States) and ghrelin receptor (ab48285, ABCAMInc, Cambridge, United States). Categorical and nominal variables were describedthrough frequencies and proportions and the difference between specific groupswere analyzed with Fisher’s and Fisher-Freeman-Halton’s method respectively.Spearman's rank correlation coefficient was determined for correlation ofexpression of ghrelin and ghrelin receptor in adenoma and adjacent colon tissuewith the grade of adenoma dysplasia.RESULTSAmong 92 patients with colorectal adenoma 43 had adenomas with high-gradedysplasia (46.7%). High expression of ghrelin was 7 times more common in highgradeadenoma compared to low-grade adenomas (13.95% to 2.04%, P = 0.048),while the expression of ghrelin in adjacent colon tissue was low. We found nocorrelation between ghrelin receptor expression in adenoma and adjacent colontissue and the grade of colorectal adenoma dysplasia. The most significantcorrelation was found between ghrelin and ghrelin receptor expression inadenomas with high-grade dysplasia (rho = 0.519, P < 0.001).CONCLUSIONGhrelin and ghrelin receptor are expressed in colorectal adenoma and adjacenttissue with ghrelin expression being more pronounced in high grade dysplasia asa possible consequence of increased local synthesis.
文摘Background The ghrelin plays an important role in the regulation of food intake and energy homeostasis. Therefore, the ghrelin receptor gene （GHSR） is an excellent candidate for studying metabolic syndrome. This study aimed to investigate whether polymorphisms in ghrelin receptor gene are associated with metabolic syndrome in Chinese population. Methods Subjects consisted of 698 patients aged 41 to 80 years, diagnosed as metabolic syndrome by International Diabetes Federation （IDF） 2005 criteria, and 762 age- and gender-matched controls. Three variants within the GHSR were selected and genotyped using polymerase chain reaction （PCR） and restriction fragment length polymorphism （RFLP）. Odds ratios were estimated using a case-control study design by controlling confounding factors. Results The NA genotype （rs2922126） in the promoter was associated with metabolic syndrome （OR 1.41, 95%C/ 1.03-1.94）, increased waist circumference （OR 1.75, 95%C/1.26-2.42）, and increased fast blood glucose （OR 1.49, 95%CI 1.07-2.06） in women. The NA genotype （rs509030） in the intron was associated with lower plasma high density lipoprotein in women （OR 1.37, 95%C/1.02-1.84）. Conclusion The polymorphisms within GHSR might be a genetic risk factor for metabolic syndrome in women.
基金supported by the National Natural Science Youth Foundation in China,No.81001501the Natural Science Foundation of Beijing in China,No.7112071Beijing University of Chinese Medicine Key Project–Nautical Chinese Medicine in China,No.522/100604054
文摘Ghrelin, a brain-gut peptide that induces anxiety and other abnormal emotions, contributes to the effects of insomnia on emotional behavior. In contrast, the traditional Chinese Medi- cine remedy Wen Dan Tang reduces insomnia-related anxiety, which may perhaps correspond to changes in the brain-gut axis. This suggests a possible relationship between Wen Dan Tan^s pharmacological mechanism and the brain-gut axis. Based on this hypothesis, a sleep-deprived rat model was induced and Wen Dan Tang was administered using oral gavage during model es- tablishment. Wen Dan Tang significantly reduced insomnia-related anxiety and prevented Ghrelin level decreases following sleep deprivation, especially in the hypothalamus. Increased expression of Ghrelin receptor mRNA in the hypothalamus was also observed, suggesting that reduced anxi- ety may be a result of Wen Dan Tan＇s regulation of Ghrelin-Ghrelin receptors.
文摘目的:探讨ghrelin对糖尿病小鼠胃排空的影响及其作用机制.方法:采用四氧嘧啶建立糖尿病小鼠模型,用灌食phenol red的方法研究糖尿病小鼠胃排空的改变,并观察注射不同剂量ghrelin(50,100和200μg/kg)对糖尿病小鼠胃动力的影响.糖尿病小鼠胃底环形平滑肌条安置在恒温灌流肌槽中并用SMUP-E生物信号处理系统记录肌条的自发收缩活动,观察不同浓度ghrelin(0.1,1和10μmol/L)对肌条自发收缩活动的影响,并研究其作用机制.结果:糖尿病小鼠的胃排空率显著低于正常小鼠的胃排空率(22.90%±1.42% vs 28.10%±1.28%,P<0.05).ghrelin能显著提高糖尿病小鼠的胃排空,具有明显的量效关系.Ghrelin在0.1,1和10μmol/L均能显著增加糖尿病小鼠离体胃底环形平滑肌肌条的自发收缩幅度(1.11±0.03,1.22±0.02,1.36±0.04 vs 1.00,均P<0.05),而atropine和L-NAME均能抑制ghrelin增加糖尿病小鼠肌条自发收缩幅度的效应.结论:Ghrelin能提高糖尿病小鼠的胃排空能力,作用机制可能是通过肌间丛神经系统的硝基能神经和胆碱能神经上的受体而起作用.
