Leukotriene D4 and cystinyl-bis-glycine metabolism in membrane-bound dipeptidase-deficient mice

Geetha M. Habib, Zheng-Zheng Shi, Allan A. Cuevas, Qiuxia Guo, Martin M. Matzuk, Michael W. Lieberman

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

We have developed mice deficient in membrane-bound dipeptidase (MBD, EC 3.4.13.19), the enzyme believed to be responsible for the conversion of leukotriene D4 (LTD4) to leukotriene E4 (LTE4). The MBD mutation generated by us was demonstrated to be a null mutation by Northern blot analysis and the absence of β-lactamase activity in lung, kidney, small intestine, and heart. MBD gene deletion had no effect on viability or fertility. The mutant mice retain partial ability to convert LTD4 to LTE4, ranging from 80-90% of the wild-type values in small intestine and liver to 16% in kidney and 40% in lung, heart, and pancreas. MBD is also believed to function consecutively after γ-glutamyl transpeptidase to cleave cystinyl- bis-glycine (cys-bis-gly) generated from glutathione cleavage. Our data Indicate that kidney homogenates from MBD-deficient mice retain ~40% of their ability to cleave cys-bis-gly, consistent with only modest elevations (3-5-fold) of cys-bis-gly in urine from MBD-deficient mice. These observations demonstrate that the conversion of LTD4 to LTE4 and the degradation of cys-bis-gly are catalyzed by at least two alternative pathways (one of which is MBD) that complement each other to varying extents in different tissues.

Original languageEnglish (US)
Pages (from-to)4859-4863
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume95
Issue number9
DOIs
StatePublished - Apr 28 1998

Keywords

  • Glutathione eicosanoids
  • Homologous recombination

ASJC Scopus subject areas

  • General
  • Genetics

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