In vitro toxicity of cereulide on porcine pancreatic Langerhans islets

Suvi M. Virtanen, Merja Roivainen, Maria A. Andersson, Petri Ylipaasto, Douwe Hoornstra, Raimo Mikkola, Mirja S. Salkinoja-Salonen*

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

Abstrakti

Cereulide is a K+ ionophore cytotoxic and mitochondriotoxic to primary cells and cell lines of human and other mammalian origins. It is a heat-stable, highly lipophilic (log K-ow 5.96)peptide (1152gmol(-1)) produced by certain strains of Bacillus cereus, a bacterium connected to emetic food poisonings. In this study the pancreatic toxicity of purified cereulide, and cereulide-containing bacterial extracts, was studied using fetal porcine Langerhans islets in culture. Exposure to 1 ng ml(-1) of purified cereulide caused necrotic cell death of the islet cells impairing their insulin content within 2 days. Cell extracts of cereulide-positive B. cereus strains connected to food poisoning or isolated from foodstuffs were toxic, corresponding to their measured cereulide content. Extracts of B. cereus strains producing or not producing the B. cereus diarrheal toxin, but no cereulide, were tolerated by the porcine islet cultures up to concentrations 1000-fold higher compared to extracts from strains containing cereulide, and up to exposure times of 7 d. Cereulide thus was identified as the B. cereus-produced substance toxic towards porcine fetal Langerhans islets and beta cells. (c) 2008 Elsevier Ltd. All rights reserved.

AlkuperäiskieliEnglanti
Sivut1029-1037
Sivumäärä9
JulkaisuTOXICON
Vuosikerta51
Numero6
DOI - pysyväislinkit
TilaJulkaistu - toukokuuta 2008
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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