目的研究中华蟾蜍(Bufo gar garizans)变态发育过程中消化道5-羟色胺(5-HT)、生长抑素(SS)、胃泌素(GAS)、胰高血糖素(GLU)和胰多肽(PP)等5种胃肠激素内分泌细胞的分布密度、组织学定位及形态的演变。方法应用链霉卵白素-过氧化物酶(SP...目的研究中华蟾蜍(Bufo gar garizans)变态发育过程中消化道5-羟色胺(5-HT)、生长抑素(SS)、胃泌素(GAS)、胰高血糖素(GLU)和胰多肽(PP)等5种胃肠激素内分泌细胞的分布密度、组织学定位及形态的演变。方法应用链霉卵白素-过氧化物酶(SP)免疫组织化学方法,每个变态发育时期取6只动物。结果 5-HT细胞在中华蟾蜍变态发育各个时期消化道中均有分布,在孵出期起始出现于消化道中部,变态前期之后整个消化道均有分布,消化道中部5-HT细胞的密度显著增加(P<0.05),从变态高峰期至幼蟾期,食道和贲门5-HT细胞的密度增加非常显著(P<0.05);GAS细胞在幼蟾期才开始出现,主要集中于十二指肠,幽门处偶见;SS细胞在变态高峰期开始出现,仅在胃体和十二指肠偶有分布,幼蟾期分布于食道至空肠的各段,细胞密度显著增加(P<0.05);GLU细胞在中华蟾蜍变态发育各个时期消化道中均有分布,变态前期之后消化道中部GLU细胞的分布密度增加非常显著(P<0.05);PP细胞在变态发育的各个时期均未检测出。在孵出期,内分泌细胞主要位于固有层,呈圆形;变态早期和前期,主要位于单层柱状上皮细胞之间,呈圆形、椭圆形或梭形;变态高峰期,内分泌细胞主要位于腺泡细胞或上皮细胞基部,固有膜中偶见,呈椭圆形或锥形;在幼蟾期,主要位于腺泡细胞和黏膜上皮细胞之间,呈圆形或椭圆形,且个别细胞具有较长的胞突伸向肠腔。结论与其他两栖动物相比,中华蟾蜍消化道内分泌细胞在变态发育过程中的演变既有一定的共性,也存在着种间差异,内分泌细胞的演变与消化生理活动及个体生理活动的变化相适应。展开更多
We studied the distribution and density of the endocrine cells in the digestive tract of Paa spinosa using immunohistochemical method (streptavidin peroxidase method) using eight gut hormone antisera. The 5 hydroxytry...We studied the distribution and density of the endocrine cells in the digestive tract of Paa spinosa using immunohistochemical method (streptavidin peroxidase method) using eight gut hormone antisera. The 5 hydroxytryptamine immunoreactive cells were distributed throughout the digestive tract with the highest density in the stomachus pyloricus, the second highest in the duodenum, fewer in the oesophagus, stomachus cardiacus and rectum. The gastrin immunoreactive cells were located mainly in the stomachus pyloricus and occasionally in different parts of the intestine. The somatostatin immunoreactive cells occured mainly in the stomach, frequently in the stomachus pyloricus, and occasionally in different parts of the intestine. The pancreatic polypeptide immunoreaetive cells were found with the highest density in the duodenum, the second highest in the stomachus cardiacus, and rarely in the rectum. No immunoreactive cells were observed with the antisera to glucagon, substance P, growth hormone and calcitonin. but there were glucagon and substance P mucosal nerve plexus throughout the digestive tract, and both with the highest density in the duodenum .展开更多
文摘目的研究中华蟾蜍(Bufo gar garizans)变态发育过程中消化道5-羟色胺(5-HT)、生长抑素(SS)、胃泌素(GAS)、胰高血糖素(GLU)和胰多肽(PP)等5种胃肠激素内分泌细胞的分布密度、组织学定位及形态的演变。方法应用链霉卵白素-过氧化物酶(SP)免疫组织化学方法,每个变态发育时期取6只动物。结果 5-HT细胞在中华蟾蜍变态发育各个时期消化道中均有分布,在孵出期起始出现于消化道中部,变态前期之后整个消化道均有分布,消化道中部5-HT细胞的密度显著增加(P<0.05),从变态高峰期至幼蟾期,食道和贲门5-HT细胞的密度增加非常显著(P<0.05);GAS细胞在幼蟾期才开始出现,主要集中于十二指肠,幽门处偶见;SS细胞在变态高峰期开始出现,仅在胃体和十二指肠偶有分布,幼蟾期分布于食道至空肠的各段,细胞密度显著增加(P<0.05);GLU细胞在中华蟾蜍变态发育各个时期消化道中均有分布,变态前期之后消化道中部GLU细胞的分布密度增加非常显著(P<0.05);PP细胞在变态发育的各个时期均未检测出。在孵出期,内分泌细胞主要位于固有层,呈圆形;变态早期和前期,主要位于单层柱状上皮细胞之间,呈圆形、椭圆形或梭形;变态高峰期,内分泌细胞主要位于腺泡细胞或上皮细胞基部,固有膜中偶见,呈椭圆形或锥形;在幼蟾期,主要位于腺泡细胞和黏膜上皮细胞之间,呈圆形或椭圆形,且个别细胞具有较长的胞突伸向肠腔。结论与其他两栖动物相比,中华蟾蜍消化道内分泌细胞在变态发育过程中的演变既有一定的共性,也存在着种间差异,内分泌细胞的演变与消化生理活动及个体生理活动的变化相适应。
文摘We studied the distribution and density of the endocrine cells in the digestive tract of Paa spinosa using immunohistochemical method (streptavidin peroxidase method) using eight gut hormone antisera. The 5 hydroxytryptamine immunoreactive cells were distributed throughout the digestive tract with the highest density in the stomachus pyloricus, the second highest in the duodenum, fewer in the oesophagus, stomachus cardiacus and rectum. The gastrin immunoreactive cells were located mainly in the stomachus pyloricus and occasionally in different parts of the intestine. The somatostatin immunoreactive cells occured mainly in the stomach, frequently in the stomachus pyloricus, and occasionally in different parts of the intestine. The pancreatic polypeptide immunoreaetive cells were found with the highest density in the duodenum, the second highest in the stomachus cardiacus, and rarely in the rectum. No immunoreactive cells were observed with the antisera to glucagon, substance P, growth hormone and calcitonin. but there were glucagon and substance P mucosal nerve plexus throughout the digestive tract, and both with the highest density in the duodenum .