Mol. Cells 2009; 28(6): 559-563
Published online November 19, 2009
https://doi.org/10.1007/s10059-009-0151-7
© The Korean Society for Molecular and Cellular Biology
Glyceraldehyde-3-phosphate is a key intermediate in several central metabolic pathways of all organisms. Aldolase and glyceraldehyde-3-phosphate dehydrogenase are involved in the production or elimination of glyceraldehyde-3-phosphate during glycolysis or gluconeogenesis, and are differentially expressed under various physiological conditions, including cancer, hypoxia, and apoptosis. In this study, we examine the effects of glyceraldehyde-3-phosphate on cell survival and apoptosis. Overexpression of aldolase protected cells against apoptosis, and addition of glyceraldehyde-3-phosphate to cells delayed apoptosis. Additionally, delayed apoptotic phenomena were observed when glyceraldehyde-3-phosphate was added to a cell-free system, in which artificial apoptotic process was induced by adding dATP and cytochrome c. Surprisingly, glyceraldehyde-3-phosphate directly suppressed caspase-3 activity in a reversible noncompetitive mode, preventing caspase-dependent proteolysis. Based on these results, we suggest that glyceraldehyde-3-phosphate, a key molecule in several central metabolic pathways, functions as a molecule switch between cell survival and apoptosis.
Keywords aldolase, apoptosis, caspase-3, GAPDH, glyceraldehyde-3-phosphate
Mol. Cells 2009; 28(6): 559-563
Published online December 31, 2009 https://doi.org/10.1007/s10059-009-0151-7
Copyright © The Korean Society for Molecular and Cellular Biology.
Mi Jang, Hyo Jin Kang, Sun Young Lee, Sang J. Chung, Sunghyun Kang, Seung Wook Chi, Sayeon Cho, Sang Chul Lee, Chong-Kil Lee, Byoung Chul Park, Kwang-Hee Bae, and Sung Goo Park
Glyceraldehyde-3-phosphate is a key intermediate in several central metabolic pathways of all organisms. Aldolase and glyceraldehyde-3-phosphate dehydrogenase are involved in the production or elimination of glyceraldehyde-3-phosphate during glycolysis or gluconeogenesis, and are differentially expressed under various physiological conditions, including cancer, hypoxia, and apoptosis. In this study, we examine the effects of glyceraldehyde-3-phosphate on cell survival and apoptosis. Overexpression of aldolase protected cells against apoptosis, and addition of glyceraldehyde-3-phosphate to cells delayed apoptosis. Additionally, delayed apoptotic phenomena were observed when glyceraldehyde-3-phosphate was added to a cell-free system, in which artificial apoptotic process was induced by adding dATP and cytochrome c. Surprisingly, glyceraldehyde-3-phosphate directly suppressed caspase-3 activity in a reversible noncompetitive mode, preventing caspase-dependent proteolysis. Based on these results, we suggest that glyceraldehyde-3-phosphate, a key molecule in several central metabolic pathways, functions as a molecule switch between cell survival and apoptosis.
Keywords: aldolase, apoptosis, caspase-3, GAPDH, glyceraldehyde-3-phosphate
Soo-Jin Lee, Sung-E Choi, Seokho Park, Yoonjung Hwang, Youngho Son, and Yup Kang*
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