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Expression of the cysteine proteinase inhibitor cystatin C gene in rat heart: use of digoxigenin-labeled probes generated by polymerase chain reaction directly for in situ and northern blot hybridizations

T Barka and H van der Noen

Department of Cell Biology/Anatomy, Mount Sinai School of Medicine, City University of New York, NY 10029-6574.

Cystatins represent a widely distributed superfamily of cysteine proteinase inhibitory proteins. We investigated the expression of the cystatin C gene, belonging to the family 2 of cystatins, in the hearts of female rats. Using a highly sensitive reverse transcriptase- polymerase chain reaction (RT-PCR) we have detected cystatin C mRNA in the ventricule and atrium, as well as in liver and submandibular gland. A digoxigenin-labeled cystatin C probe, generated by PCR, hybridized to a single mRNA species of about 700 nucleotides on Northern blots. Northern blot hybridizations established that neither an acute inflammation produced by injection of turpentine nor administration of the beta-adrenergic agonist isoproterenol had an effect on the level of cystatin C mRNA in the heart. In situ hybridizations with digoxigenin- labeled probe localized the expression of the cystatin C gene to cardiac muscle fibers but not to other cardiac cellular elements. Cystatin C may be released by cardiac muscle fibers under physiological and pathological conditions and may modify inflammatory and necrobiotic processes.

Volume 41, Issue 12, pp. 1863-1867, 12/01/1993
Copyright © 1993 by The Histochemical Society


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