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Journal of Histochemistry and Cytochemistry, Vol. 45, 559-568, Copyright © 1997 by The Histochemical Society, Inc.

ARTICLE

Immunolocalization of Lipoprotein(a) in Wounded Tissues

Yoko Yanoa, Kuniyasu Shimokawaa, Yume Okadaa, and Akio Nomaa
a Department of Laboratory Medicine, Gifu University School of Medicine, Gifu, Japan

Correspondence to: Yoko Yano, Dept. of Laboratory Medicine, Gifu Univ. School of Medicine, Tukasa-machi 40, Gifu-500, Japan.

Fifty samples from inflamed tissues were examined by immunohistochemical techniques, using antibodies against apo(a), apo B, plasminogen, fibrinogen, proliferating cell nuclear antigen (PCNA), and various components of extracellular matrix. The immunohistochemical features of granulation tissues were characterized by different stages of wound healing. In the first stage, immunoreactivities for anti-apo(a) and anti-apo B were weak and focal, whereas those for anti-plasminogen and anti-fibrinogen were strong and were widespread on the tissue surface. In the second stage, granulation tissues were covered with loose fibrous connective tissue, designated as a "fibrous cap." In this stage, markedly positive staining for lipoprotein(a) [Lp(a)] was observed closer to the surface of the fibrous cap than plasminogen, suggesting that Lp(a) may prevent external fibrinolysis. Lp(a) was also found in endothelial cells and the extracellular space of small vessels underlying the fibrous cap. In the last stage of healing, apo(a) and apo B were not detectable in completely organized tissues. These findings suggest that Lp(a) plays a role in the wound healing. (J Histochem Cytochem 45:559-568, 1997)

Key Words: wound, lipoprotein(a), immunohistochemistry, granulation tissue


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