非洲鸵鸟胸腺内生长抑素的分布特点OA

In order to explore the distribution of somatostatin(SST)in the thymus of African ostriches,6 healthy African ostriches aged 1-day-old,45-day-old,and 90-day-old in rearing period,as well as 6 adult African ostriches aged 334-day-old,were selected.After anesthesia,thymus tissues were collected and processed into paraffin sections.Immunohistochemistry was used to detect SST-positive cells within the thymus.The number of SST-positive cells per unit area was counted,and the distribution patterns and morphological features of these cells were observed specifically in the 90-day-old ostriches.The results showed that SST-positive cells were present in the thymus of African ostriches at all examined ages.With the increase of age,the number of SST-positive cells per unit area in the thymus showed an upward trend.Compared with the 1-day-old group,the number of SST-positive cells per unit area was significantly increased in the 45-day-old,90-day-old,and 334-day-old groups(P<0.05).Although there was a slight increase in the number of SST-positive cells per unit area in the thymus of African ostriches at 90-day-old and 334-day-old of age compared with 45-day-old,the differences were not significant(P>0.05).In 90-day-old ostriches,SST-positive cells were scattered throughout the thymus and primarily concentrated in border area between the thymic cortex and medulla,most SST-postive cells appeared round or conical in shape,while a few SST-postive cells were spindle-shaped or pear-shaped,accompanied by slender cytoplasmic projections.These findings indicated that SST expression in the thymus of African ostriches increased rapidly during the early brooding stage and subsequently stabilizes and then stabilized.SST-positive cells were mainly distributed in the corticomedullary junction region of the thymus.