PMID: 9547361May 9, 1998Paper

Nuclear localization of overexpressed glyceraldehyde-3-phosphate dehydrogenase in cultured cerebellar neurons undergoing apoptosis

Molecular Pharmacology
R IshitaniD M Chuang

Abstract

We recently reported that overexpression of glyceraldehyde-3-phosphate dehydrogenase (GAPDH; EC 1.2.1.12) is directly involved in cytosine arabinonucleoside (ara-C)- and low K+-induced neuronal death of cultured cerebellar granule cells. The former is entirely due to apoptosis, whereas the latter involves both apoptosis and necrosis. We examined the subcellular distribution of the overexpressed GAPDH occurring during apoptosis by using both subcellular fractionation and immunocytochemistry with a monoclonal antibody directed against this overexpressed protein. When immature cerebellar neurons were exposed to ara-C, an overexpression of GAPDH was observed, primarily in the nuclear fraction. In contrast, low K+ exposure of mature cerebellar neurons induced the overexpression of GAPDH not only in the nuclear fraction but also in the mitochondrial fraction. In both paradigms, no significant change of GAPDH levels occurred in the microsomal and cytosolic fractions. Moreover, pretreatment with GAPDH antisense oligonucleotide or classic apoptotic inhibitors clearly suppressed the accumulation of GAPDH protein in these subcellular loci. This discrete nuclear localization of GAPDH during apoptosis was supported further by immunoelectron...Continue Reading

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Citations

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