IMMUNOHISTOCHEMICAL OBSERVATION OF AGE-RELATED CHANGES OF TYPES Ⅰ AND Ⅲ COLLAGEN IN RAT HEART / 解剖学报

ABSTRACT

Objective To investigate age-related changes of type Ⅰ and Ⅲ collagen in rat heart. Methods Twenty-one male Wistar rats were divided randomly into infanct,young and old group.Types Ⅰ and Ⅲ collagen expresson of different age hearts were studied by SP immunohistochemical methods. Results 1.Type Ⅰ and Ⅲ collagen all constitute thick fiber and fibril.The fibrils encircled every cardiac muscle and formed collagen net each other.The thick fibers being plaque were located among cardiac muscle groups.The content of type Ⅰ collagen was more than that of type Ⅲ.2.There were distinct expression difference of type Ⅰ and Ⅲ collagen in different aging rat hearts.The collagens distributed densely and evenly in infancy rat heart,and loosely and uniformly in young rat heart,and the contents were increased distinctly with heterogeneous distribution in old rat heart.The cardiac collagen was growing from infanct to old rat,and rapid progress of cardiac collagen was seen in young rat. 3.The content of collagen in right ventricle was more than that of left ventricle of infanct heart.The collagen in all parts of the heart is not of difference both in yound and old rat. Conclusion The contents of type Ⅰ collagen is more than that of type Ⅲ collagen.The two types collagen are increasing with growing.;