AIM： To investigate the in vivo effect of beta-casomorphin-7on the regulation of gastric somatostatin and gastrin messenger RNA in rat gastric mucosa.METHODS： Somatostatin and gastrin mRNA were quantified by RT-PCR ...AIM： To investigate the in vivo effect of beta-casomorphin-7on the regulation of gastric somatostatin and gastrin messenger RNA in rat gastric mucosa.METHODS： Somatostatin and gastrin mRNA were quantified by RT-PCR and in situ hybridization （ISH）in 24 rats. The rats were divided into three treatment groups： basal diet ＋ physiological saline （n = 8）, basal diet ＋ beta-casomorphin-7 （7.5 × 10^-7 mol） （n = 8）,and basal diet ＋ poly-Gly-7 （containing equal mol of N with 7.5 × 10^-7 mol beta-casomorphin-7） （n = 8）.After oral administration for 30 days, rats were killed by exsanguinations.RESULTS： After intra-gastric administration of betacasomorphin-7 for 30 d, gastrin mRNA increased by 52.8% （P 〈 0.05, n = 8）, and somatostatin mRNA levels decreased by 30.7% compared with the controls （P 〈0.01, n = 8）. No significant differences in the expression of the two genes were observed in the poly-Gly-treated group, although gastrin mRNA expression was elevated by 35.6% as against the control group （P = 0.15, n =8）. The long-term oral administration of a casomorphin solution significantly decreased the even gray of D-cells,but did not lower the number of D-cells both in the antrum and fundus. Interestingly, the number of G-cells increased in the antrum and fundus, but its average density was augmented only in the antrum.CONCLUSION： Beta-casomorphin-7 is capable of modulating gene expression of the regulatory peptides from G and D cells. Data from in situ hybridization studies indicate that beta-casomorphin-7 affects gastrin gene expression indirectly by means of the paracrine action of somatostatin, and depends on its intrinsic molecular function.展开更多
基金Supported by the National Natural Science Foundation of China, No. 39770540
文摘AIM： To investigate the in vivo effect of beta-casomorphin-7on the regulation of gastric somatostatin and gastrin messenger RNA in rat gastric mucosa.METHODS： Somatostatin and gastrin mRNA were quantified by RT-PCR and in situ hybridization （ISH）in 24 rats. The rats were divided into three treatment groups： basal diet ＋ physiological saline （n = 8）, basal diet ＋ beta-casomorphin-7 （7.5 × 10^-7 mol） （n = 8）,and basal diet ＋ poly-Gly-7 （containing equal mol of N with 7.5 × 10^-7 mol beta-casomorphin-7） （n = 8）.After oral administration for 30 days, rats were killed by exsanguinations.RESULTS： After intra-gastric administration of betacasomorphin-7 for 30 d, gastrin mRNA increased by 52.8% （P 〈 0.05, n = 8）, and somatostatin mRNA levels decreased by 30.7% compared with the controls （P 〈0.01, n = 8）. No significant differences in the expression of the two genes were observed in the poly-Gly-treated group, although gastrin mRNA expression was elevated by 35.6% as against the control group （P = 0.15, n =8）. The long-term oral administration of a casomorphin solution significantly decreased the even gray of D-cells,but did not lower the number of D-cells both in the antrum and fundus. Interestingly, the number of G-cells increased in the antrum and fundus, but its average density was augmented only in the antrum.CONCLUSION： Beta-casomorphin-7 is capable of modulating gene expression of the regulatory peptides from G and D cells. Data from in situ hybridization studies indicate that beta-casomorphin-7 affects gastrin gene expression indirectly by means of the paracrine action of somatostatin, and depends on its intrinsic molecular function.
