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Ochratoxin A at nanomolar concentrations: A signal modulator in renal cells
Author(s) -
Gekle Michael,
Sauvant Christoph,
Schwerdt Gerald
Publication year - 2005
Publication title -
molecular nutrition and food research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.495
H-Index - 131
eISSN - 1613-4133
pISSN - 1613-4125
DOI - 10.1002/mnfr.200400062
Subject(s) - ochratoxin a , function (biology) , nephrotoxicity , microbiology and biotechnology , kinase , kidney , metabolite , chemistry , carcinogen , biology , mycotoxin , biochemistry , endocrinology , food science
Ochratoxin A (OTA) is a ubiquitous fungal metabolite with nephrotoxic, carcinogenic, and apoptotic potential. Toxicokinetics make the kidney the primary target organ for OTA. Due to its widespread occurrence in improperly stored foodstuff the complete and safe avoidance of OTA for humans is impossible. There are several reports showing a significant correlation between OTA exposure and certain forms of nephropathies. At nanomolar concentrations OTA leads to specific changes of function and phenotype in renal cells. The toxin interacts with certain cellular “key‐molecules” ( e. g. , mitogen‐activated protein (MAP) kinases, Ca 2+ ), thereby disturbing cellular signalling and regulation events as well as mitochondrial function. Moreover, OTA has the ability to modulate physiological signals ( e. g. , angiotensin II or TNFα) and thereby influences cell function and cell growth and may even stable re‐program the cells ( e. g. , altered distribution of chromosomes). This review concentrates on the effects of OTA in the nanomolar range and its interactions with cellular signalling networks in different renal cells proposing OTA to act as a signal modulator.