Comparison of microstructures of the carotid body between yaks and chaidamu yellow cattles

doi:10.16098/j.issn.0529-1356.2016.03.015

Abstract

Abstract:

Objective To compare the structural characteristics of the carotid body （CB） between yaks and chaidamu yellow cattles. Methods Health adult yaks (n=5) and chaidamu yellow cattles (n =5) were used in this study. The microstructure and ultrastructure of CB were observed by histologial, immunohistochemical SP methods and transmission electron microscopy techniques. The volume density(Vv), surface density(Sv), numerical density on area(NA) and specific surface(δ) of type Ⅰ cells(light and dark) and type Ⅱ cells and microvessels of carotid body were compared by light microscopy and microstereology between yaks and chaidamu yellow cattles. Results The CBs of yak and chaidamu yellow cattle were composed of parenchyma and mesenchyme. There were many round or oval gloubs with rich parenchymal cells. There were more type Ⅰ cells in yaks than in chaidamu yellow cattles, but there were less and smaller mitochondria and electron densecored vesicles(EDCV) of the type I cells in yaks than in chaidamu yellow cattles. The connective tissue among gloubs and interstitial cells in chaidamu yellow cattles were significantly more than yaks, but there were more rich capillaries in mesenchyme and bigger vascular lumen in yaks than in chaidamu yellow cattles. The Vv、Sv、NAof CB light cells in yaks were significantly greater than that in chaidamu yellow cattles (P<0.01),while δ of CB light cells in yaks was less than in chaidamu yellow cattles(P>0.05). The Vv、Sv of CB dark cells in yaks were significantly less than in chaidamu yellow cattles (P<0.05), and there was no significant difference of NAand δ between yaks and chaidamu yellow cattles(P>0.05). In type Ⅱ cells, there was no significant difference in Vv、Sv、NA、δ between two groups (P>0.05). The Vv、Sv、NA of the CB microvessels in yaks were obviously greater than that in chaidamu yellow cattles (P<0.01), while δ in yaks CB was significantly less than in chaidamu yellow cattle (P<0.01). Conclusion The inheret tissue cell composition and vascular net of yak CB are formed to enhance the adaptability to plateau hypoxic environment.

CHANG Lan ZHANG Shou LEI Nai-hu MA Yan-fang BAI Zhen-zhong SHEN Ming-hua GE Ri-li*. Comparison of microstructures of the carotid body between yaks and chaidamu yellow cattles[J]. AAS, 2016, (3): 374-380.

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