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TGF-β1 inhibits caspase-3 activation and neuronal apoptosis in rat hippocampal cultures

Authors
Journal
Neurochemistry International
0197-0186
Publisher
Elsevier
Publication Date
Volume
38
Issue
3
Identifiers
DOI: 10.1016/s0197-0186(00)00084-x
Keywords
  • Tgf-β1
  • Neuronal Apoptosis
  • Caspase-3
  • Staurosporine
  • Rat Primary Hippocampal Culture

Abstract

Abstract The effect of TGF-β1 on apoptosis varies depending on the cell type, the kind of stimulus and the experimental conditions. The present study attempted to identify whether TGF-β1 can prevent neuronal apoptosis and interrupt caspase-3 activation in rat primary hippocampal cultures after staurosporine treatment. TGF-β1 at the concentration of 1 and 10 ng/ml significantly reduced neuronal damage as detected by trypan blue exclusion. Nuclear staining with Hoechst 33258 and TUNEL-staining further demonstrated that TGF-β1 at the same concentration range effectively diminished neuronal apoptosis 24 h after staurosporine treatment, whereas 0.1 ng/ml of TGF-β1 did not. Furthermore, TGF-β1 (1 and 10 ng/ml) markedly inhibited the activation of caspase-3 induced by staurosporine as demonstrated by both caspase-3 activity assay and Western blotting. This study provides evidence that TGF-β1 is able to efficiently inhibit caspase-3 activation, and thereby protects cultured hippocampal neurons against apoptosis.

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