THE STUDIES ON CONSERVATION AND NATURE OF KINETOCHORE ANTIGEN WITH HUMAN AUTOANTIBODIES FROM SCLERODERMA PATIENTS
利用硬皮病病人的自发抗体研究着丝点抗原的保守性及其性质

Six types of cells have been studied by means of indirect immunofluores-cence staining method, using four kinds of human CREST scltroderma autoimmune antikinelochore scrum which were separately taken from Shanghai, Beijing, the United States of America. The six types of cells are Hep-2 cell strain from human laryngeal carcinoma, the bone marrow cells of Gekko swinhonis, ihe bone marrow cells of Bufo bufo, CIK cell line from the kidmey of Ctccop-haryngodon idellus, C6/36 cell strain of Aedes albopictus, the root apical cells of Allium cepa L. The four kinds of serum were found to display discrete spots in all six types of cells by immunofluorcscence. The number of spots per cell corresponds to the chromosome number in the cell types observed. In Hep-2 cells, the spots only exist in the kinetochore region of mitotic chromosomes, and each chromosome has two fluorescent spots. The results reveal that the kinetochore antigen preserves high conservation in evolution, and it possesses similar antigenicity in mammalian, reptilian, amphibian, fish, insectan and plant cells. The significance of the extensive conservation have been also discussed. In addition, the nature of the kinetochore antigen has been studied. The results of cytochemical analysis show that the antigen possesses complete similar anligenic nature in Hep-2 cells and the bone marrow cells of Bufo bufo. The kinetochore antigen is tightly bound non-histones. Its site(s) sensitive to protcslytic enzymes is (are) not exposed to outside, it is not complexed with DNA or RNA and is not extracted by 4.M Urea/2M NaCl, it is risistant to 0.1M HC1, 0.07M NaOH, but is partly destroyed by acetic acid. Finally, the methods taken in this study may be directly used to detect antikinctochore antibody in clinical diagnosis, so the study have some practical significance.