Tissue Distribution of Avian Pancreatic Polypeptide-Degrading Activity

Martin L. Adamo, Robert L. Hazelwood

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Degradation of avian pancreatic polypeptide (APP) by subcellular fractions from homogenates of chicken kidney, liver, and brain was characterized in this study. Chicken kidney cytosol exhibited the highest degrading activity of all kidney subcellular fractions studied including nuclear, mitochondrial, and microsomal. The cytosolic kidney APP-degrading activity was inhibited in a dose-dependent manner by bacitracin, serine protease inhibitors, and dithiothreitol, and eluted in the void volume of a Sephadex G-100 column, indicating that it is a soluble, serine protease-like activity with a Mr > 100,000 kDa and with some dependence on disulfide bonds. Soluble cytosol fractions from chicken liver, kidney, and brain all exhibited greater APP-degrading activity than that of corresponding membrane fractions and, furthermore, were similar in activity between one another. It is concluded that APP degradation by tissue homogenates occurs via a soluble, cytosolic protease which is inhibited by selected serine protease inhibitors; the activity does not differ among liver, kidney, and brain, three tissues which show different receptivity for APP.

Original languageEnglish (US)
Pages (from-to)341-345
Number of pages5
JournalProceedings of the Society for Experimental Biology and Medicine
Volume191
Issue number4
DOIs
StatePublished - Sep 1989
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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