Microcystin congener- and concentration-dependent induction of murine neuron apoptosis and neurite degeneration.

Animals; Apoptosis; Apoptosis: drug effects; Blotting; Cell Survival; Cell Survival: drug effects; Cells; Cerebellum; Cerebellum: drug effects; Cerebellum: pathology; Cultured; Cyanobacteria; Cyanobacteria: metabolism; Dose-Response Relationship; Drug; Fluorescence; Inbred BALB C; Mice; Microcystins; Microcystins: chemistry; Microcystins: toxicity; Microscopy; Neurites; Neurites: drug effects; Neurites: pathology; Neurons; Neurons: drug effects; Neurons: pathology; Newborn; Phosphorylation; Western; tau Proteins; tau Proteins: metabolism

Abstract :

[en] Cyanobacterial microcystins (MCs) represent a toxin group with > 100 variants, requiring active uptake into cells via organic anion-transporting polypeptides, in order to irreversibly inhibit serine/threonine-specific protein phosphatases. MCs are a human health hazard with repeated occurrences of severe poisonings. In the well-known human MC intoxication in Caruaru, Brazil (1996), patients developed signs of acute neurotoxicity, e.g., deafness, tinnitus, and intermittent blindness, as well as subsequent hepatotoxicity. The latter data, in conjunction with some animal studies, suggest that MCs are potent neurotoxins. However, there is little data to date demonstrating MC neuron-specific toxicity. MC exposure-induced cytotoxicity, caspase activity, chromatin condensation, and microtubule-associated Tau protein hyperphosphorylation (epitopes serine199/202 and serine396) were determined. Neurite degeneration was analyzed with confocal microscopy and neurite length determined using image analysis. MC-induced apoptosis was significantly increased by MC-LF and MC-LW, however, only at high concentrations (≥ 3µM), whereas significant neurite degeneration was already observed at 0.5µM MC-LF. Moreover, sustained hyperphosphorylation of Tau was observed with all MC congeners. The concentration- and congener-dependent mechanisms observed suggest that low concentrations of MC-LF and MC-LW can induce subtle neurodegenerative effects, reminiscent of Alzheimer's disease type human tauopathies, and thus should be taken more seriously with regard to potential human health effects than the apical cytotoxicity (apoptosis or necrosis) demonstrated at high MC concentrations.

Disciplines :

Neurology

Author, co-author :

Feurstein, Daniel

Stemmer, Kerstin

Kleinteich, Julia ; Université de Liège - ULiège > Département des sciences de la vie > Physiologie et génétique bactériennes

Speicher, Tobias

Dietrich, Daniel R.

Language :

English

Title :

Microcystin congener- and concentration-dependent induction of murine neuron apoptosis and neurite degeneration.

Publication date :

2011

Journal title :

Toxicological Sciences

ISSN :

1096-6080

eISSN :

1096-0929

Publisher :

Oxford University Press, United Kingdom

Volume :

124

Issue :

Pages :

424-31

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://www.ncbi.nlm.nih.gov/pubmed/21934130

Available on ORBi :

since 10 February 2015

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