Title : Mechanism of homocysteine-induced Rac1/NADPH oxidase activation in mesangial cells: role of guanine nucleotide exchange factor Vav2.

Pub. Date : 2007

PMID : 17982273






5 Functional Relationships(s)
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1 Mechanism of homocysteine-induced Rac1/NADPH oxidase activation in mesangial cells: role of guanine nucleotide exchange factor Vav2. Homocysteine Rac family small GTPase 1 Rattus norvegicus
2 By small interfering RNA (siRNA), it was found that Rac1-siRNA attenuated Hcys-induced superoxide (O(2)(-)) production. Homocysteine Rac family small GTPase 1 Rattus norvegicus
3 In Vav2-siRNA transfected RMCs, Hcys-induced Rac activity was blocked, which was accompanied by significant reduction of Hcys-induced O(2)(-). Homocysteine Rac family small GTPase 1 Rattus norvegicus
4 This Vav2-siRNA also blocked Rac activation induced by C16-Ceramide (C16-Cer), an intermediate lipid product stimulated by Hcys. Homocysteine Rac family small GTPase 1 Rattus norvegicus
5 These results suggest that Vav2 importantly contributes to Hcys-induced increase in Rac1 activity and consequent activation of NADPH oxidase in RMCs via ceramide-associated tyrosine phosphorylation. Homocysteine Rac family small GTPase 1 Rattus norvegicus