Distribution of UDPglucuronosyltransferase in rat tissue

Jayanta Roy-Chowdhury, P. M. Novikoff, N. R. Chowdhury, A. B. Novikoff

Research output: Contribution to journalArticle

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Abstract

UDPglucuronosyltransferase [UDPglucuronate β-D-glucuronosyltransferase (acceptor-unspecific), EC 2.4.1.17] is a group of enzymes with distinct but partially overlapping substrate specificity. A rabbit antiserum raised against one purified rat liver UDPglucuronosyltransferase isoform was specific for UDPglucuronosyltransferase and recognized all transferase isoforms by immunodiffusion or immunotransblot analysis. The transferase activity toward all substrates was immunoabsorbed from solubilized rat liver microsomes by IgG purified from the antiserum. The purified IgG was used for immunocytochemical localization of UDPglucuronosyltransferase in rat liver, jejunum, kidney, and adrenal gland. In the liver, UDPglucuronosyltransferase was present exclusively in hepatocytes and was uniformly distributed within all zones of the hepatic lobule. In the jejunum, the transferase was present exclusively in the epithelial cells and showed a progressive increase in concentration from the crypt to the villar tip. In the kidney, the greatest concentration of the transferase was observed in the epithelial cells of the proximal convoluted tubule. Adrenal medullary cells showed intense immunocytochemical staining; the zona glomerulosa and the zona reticularis of the adrenal cortex were more intensely stained than the zona fasciculata. By light microscopy, UDPglucuronosyltransferase was found in the endoplasmic reticulum and nuclear envelope of all the four organs; this was confirmed in the hepatocyte by electron microscopy. The transferase was not observed in mitochondria, Golgi apparatus, lysosomes, peroxisomes, and plasma membrane, even after 3- to 4-fold induction of various substrate-specific UDPglucuronosyltransferase activities.

Original languageEnglish (US)
Pages (from-to)2990-2994
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume82
Issue number9
StatePublished - 1985

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Glucuronosyltransferase
Transferases
Liver
Jejunum
Immune Sera
Hepatocytes
Protein Isoforms
Immunoglobulin G
Epithelial Cells
Zona Reticularis
Zona Fasciculata
Zona Glomerulosa
Kidney
Peroxisomes
Immunodiffusion
Adrenal Cortex
Nuclear Envelope
Golgi Apparatus
Liver Microsomes
Adrenal Glands

ASJC Scopus subject areas

  • General
  • Genetics

Cite this

Distribution of UDPglucuronosyltransferase in rat tissue. / Roy-Chowdhury, Jayanta; Novikoff, P. M.; Chowdhury, N. R.; Novikoff, A. B.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 82, No. 9, 1985, p. 2990-2994.

Research output: Contribution to journalArticle

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