Matrix metalloproteinases 2 and 9 fail to influence drug-induced neuroapoptosis in developing rat brain.
Matrix metalloproteinases (MMPs) play an essential role in tissue repair, cell death, and morphogenesis. The aim of the present study was to investigate potential involvement of selected MMPs in the pathogenesis of neuronal apoptosis induced by the NMDA antagonist MK-801 (dizocilpine) or the GABA(A) agonist phenobarbital in infant rats, transgenic rats overexpressing MMP-9 and MMP-9 knockout mice. Seven-day-old rats or knockout mice received intraperitoneal injections of MK-801, 1 mg/kg, or phenobarbital, 50 mg/kg. At different survival intervals following administration of the compounds (1-72 h), pups were sacrificed, tissue from different brain regions was isolated, and the expression and activity of MMP-2 and MMP-9 were analyzed by real-time PCR, western blot, and zymography. In addition, brains were fixed and processed for TUNEL staining. In all the brain regions analyzed, we found an increased number of TUNEL-positive cells 24 h after administration of MK-801. After treatment, we detected no significant increase in MMP-2 or MMP-9 mRNA expression in cortical areas. No changes in the MMP-9 protein expression or gelatinolytic activity of MMP-2 were observed in conjunction with MK-801 or phenobarbital-induced neuroapoptosis in any brain region analyzed. The extent of neurodegeneration induced by MK-801 or phenobarbital was not altered in MMP-9 transgenic rats and was increased in MMP-9 knockout mice compared to wild-type rats and mice. Treatment with the panmetalloproteinase inhibitor GM6001 did not confer protection against MK-801-induced apoptotic cell death in the developing rat brain. Our results suggest that activation of MMP-9 and MMP-2 does not contribute to pathogenesis of neuronal apoptosis caused by NMDA antagonists or GABA(A) agonists in the developing rat and mouse brain.
Uckermann
Ortrud
O
Department of Pediatric Neurology, Children's Hospital, Medical Faculty Carl Gustav Carus, Technical University Dresden, Fetscherstrasse 74, 01307 Dresden, Germany.
Luksch
Hella
H
Stefovska
Vanya
V
Hoehna
Yvonne
Y
Marzahn
Jenny
J
Theil
Marlen
M
Pesic
Mila
M
Górkiewicz
Tomasz
T
Gawlak
Maciej
M
Wilczynski
Grzegorz M
GM
Kaczmarek
Leszek
L
Ikonomidou
Chrysanthy
C
D000818:Animals; D000831:Animals, Newborn; D017209:Apoptosis / Q000187:drug effects / Q000502:physiology*; D001921:Brain / Q000187:drug effects / Q000201:enzymology* / Q000254:growth & development; D016291:Dizocilpine Maleate / Q000633:toxicity*; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism* / Q000502:physiology; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism* / Q000502:physiology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009474:Neurons / Q000166:cytology* / Q000187:drug effects* / Q000201:enzymology; D010634:Phenobarbital / Q000633:toxicity*; D051381:Rats; D017208:Rats, Wistar
D016291:Dizocilpine Maleate; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9; D010634:Phenobarbital