Hepatocyte growth factor increases mitochondrial mass in glioblastoma cells.

Abstract:

:Hepatocyte growth factor/scatter factor (HGF) is a multifunctional growth factor that is linked to the initiation and/or progression of numerous malignancies. HGF also alters cancer cell responses to DNA damaging cytotoxic agents. Many cell responses to Met activation require alterations in metabolic activity but how the metabolic machinery responds to Met activation remains poorly defined. Treating human glioblastoma cells with HGF followed by the topoisomerase inhibitor camptothecin was found to increase the activity per cell of the mitochondrial respiratory chain enzyme succinate-tetrazolium reductase (>80% increase, p < 0.05) and the tricarboxylic acid cycle enzyme succinate dehydrogenase (>25% increase, p < 0.05). Treatment with either HGF or camptothecin alone had no effect on enzyme activity. The mitochondrial enzymatic response to HGF was dose- and time-dependent with the maximum increase occurring in cells pre-treated with 30 ng/ml HGF for 48h prior to camptothecin exposure. This enzymatic response was associated with a concurrent increase in mitochondrial mass of comparable magnitude (approximately 56%, p < 0.05) as measured by fluorescent mitochondrial staining and flow cytometry. The mitochondrial mass response to HGF was prevented by the MAP-kinase pathway inhibitor PD98059 and was unaffected by the phosphatidylinositol 3-kinase inhibitors LY294002 and wortmannin. These findings suggest that HGF influences cell responses to chemotherapeutic stress, in part, by altering mitochondrial functions through a MAP-kinase dependent increase in mitochondrial mass.

authors

Xia S,Laterra J

doi

10.1016/j.bbrc.2006.05.064

subject

Has Abstract

pub_date

2006-07-14 00:00:00

pages

1358-64

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(06)01043-6

journal_volume

345

pub_type

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