Fumonisin toxicity and sphingolipid biosynthesis.

Published

Journal Article (Review)

Fumonisins are inhibitors of sphinganine (sphingosine) N-acyltransferase (ceramide synthase) in vitro, and exhibit competitive-type inhibition with respect to both substrates of this enzyme (sphinganine and fatty acyl-CoA). Removal of the tricarballylic acids from fumonisin B1 reduces the potency by at least 10 fold; and fumonisin A1 (which is acetylated on the amino group) is essentially inactive. Studies with diverse types of cells (hepatocytes, neurons, kidney cells, fibroblasts, macrophages, and plant cells) have established that fumonisin B1 not only blocks the biosynthesis of complex sphingolipids; but also, causes sphinganine to accumulate. Some of the sphinganine is metabolized to the 1-phosphate and degraded to hexadecanal and ethanolamine phosphate, which is incorporated into phosphatidylethanolamine. Sphinganine is also released from cells and, because it appears in blood and urine, can be used as a biomarker for exposure. The accumulation of these bioactive compounds, as well as the depletion of complex sphingolipids, may account for the toxicity, and perhaps the carcinogenicity, of fumonisins.

Full Text

Duke Authors

Cited Authors

  • Merrill, AH; Wang, E; Vales, TR; Smith, ER; Schroeder, JJ; Menaldino, DS; Alexander, C; Crane, HM; Xia, J; Liotta, DC; Meredith, FI; Riley, RT

Published Date

  • 1996

Published In

Volume / Issue

  • 392 /

Start / End Page

  • 297 - 306

PubMed ID

  • 8850625

Pubmed Central ID

  • 8850625

International Standard Serial Number (ISSN)

  • 0065-2598

Digital Object Identifier (DOI)

  • 10.1007/978-1-4899-1379-1_25

Language

  • eng

Conference Location

  • United States