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American Journal of Pathology, Vol 127, 389-402, Copyright © 1987 by American Society for Investigative Pathology

REGULAR ARTICLES

HHF35, a muscle actin-specific monoclonal antibody. II. Reactivity in normal, reactive, and neoplastic human tissues

T Tsukada, MA McNutt, R Ross and AM Gown

Monoclonal antibody HHF35 has previously been characterized biochemically as recognizing isotypes of actin (alpha and gamma) which are specific to muscle cells. In this study, the authors have investigated the normal and pathologic tissue distribution of HHF35- positive cells using the avidin-biotin immunoperoxidase method on methacarn-fixed, paraffin-embedded sections of human tissue. In addition to muscle tissues (smooth, skeletal, and cardiac) the antibody localizes to myoepithelium, as well as most of the capsular cells of several parenchymal organs, including liver, kidney, and spleen, with extension of the latter cells into the splenic trabeculaes. In pathologic tissues, the antibody localizes to cells, identified by some investigators as "myofibroblasts," in the stroma of certain tumors, within hyperplastic fibrous tissue responses ("fibromatoses") such as Dupuytren's contracture, and within fibrotic lung tissue. HHF35 also localizes to cells that proliferate within the intima in lesions of atherosclerosis and to a unique population of reactive mesothelial and submesothelial cells. Among tumors, it is positive only on leiomyomas, leiomyosarcomas, and rhabdomyosarcomas, and negative on all nonmuscle sarcomas. This antibody thus shows great potential utility as a diagnostic reagent in various pathologic conditions, most especially in the diagnosis of tumors of muscle origin.

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