Human gelsolin prevents apoptosis by inhibiting apoptotic mitochondrial changes via closing VDAC.
Gelsolin is a Ca2+-dependent actin-regulatory protein that modulates actin assembly and disassembly, and is believed to regulate cell motility through modulation of the actin network. Gelsolin was also recently suggested to be involved in the regulation of apoptosis: human gelsolin (hGsn) has anti-apoptotic activity, whereas mouse gelsolin (mGsn) exerts either proapoptotic or anti-apoptotic activity depending on different cell types. Here, we studied the basis of anti-apoptotic activity of hGsn. We showed that both endogenous and overexpressed hGsn has anti-apoptotic activity, that depends on its C-terminal half. We also found that hGsn and its C-terminal half but not mGsn could prevent apoptotic mitochondrial changes such as Apsi loss and cytochrome c release in isolated mitochondria to a similar extent as Bcl-xL, indicating that hGsn targets the mitochondria to prevent apoptosis via its C-terminal half. In the same way as anti-apoptotic Bcl-xL, which we recently found to prevent apoptotic mitochondrial changes by binding and closing the voltage-dependent anion channel (VDAC), hGsn and its C-terminal half inhibited the activity of VDAC on liposomes through direct binding in a Ca2+-dependent manner. These results suggest that hGsn inhibits apoptosis by blocking mitochondrial VDAC activity.
Kusano
H
H
Osaka University Graduate School of Medicine, Biomedical Research Center, Department of Medical Genetics, Suita, Japan.
Shimizu
S
S
Koya
R C
RC
Fujita
H
H
Kamada
S
S
Kuzumaki
N
N
Tsujimoto
Y
Y
D016475:3T3 Cells / Q000378:metabolism; D000199:Actins / Q000378:metabolism; D000818:Animals; D017209:Apoptosis / Q000502:physiology*; D002118:Calcium / Q000502:physiology; D002614:Chelating Agents / Q000494:pharmacology; D018260:Gelsolin / Q000737:chemistry / Q000235:genetics / Q000502:physiology*; D006367:HeLa Cells / Q000378:metabolism; D006801:Humans; D017136:Ion Transport / Q000502:physiology*; D019169:Jurkat Cells / Q000378:metabolism; D008081:Liposomes; D051379:Mice; D008928:Mitochondria / Q000378:metabolism*; D008930:Mitochondria, Liver / Q000378:metabolism; D009363:Neoplasm Proteins / Q000502:physiology; D018272:Porins / Q000008:administration & dosage / Q000378:metabolism*; D017434:Protein Structure, Tertiary; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000502:physiology; D051381:Rats; D011993:Recombinant Fusion Proteins / Q000502:physiology; D013045:Species Specificity; D014162:Transfection; D050994:Voltage-Dependent Anion Channels; D051020:bcl-X Protein
D000199:Actins; C494811:BCL2L1 protein, human; C494812:Bcl2l1 protein, mouse; C494813:Bcl2l1 protein, rat; D002614:Chelating Agents; D018260:Gelsolin; D008081:Liposomes; D009363:Neoplasm Proteins; D018272:Porins; D019253:Proto-Oncogene Proteins c-bcl-2; D011993:Recombinant Fusion Proteins; D050994:Voltage-Dependent Anion Channels; D051020:bcl-X Protein; D002118:Calcium