| Popis: |
aveolae appear in a multitude of processes encompassing growth regulation andtrafficking. We demonstrate the abundant presence of ESA/reggie-1/flotillin-2,ATP synthase β subunit and annexin V in endothelial caveolae byimmunopurification of caveolae from vascular endothelial membrane. Fiveproteins are abundant in a caveolin-1 protein complex, analyzed by sucrosegradient velocity sedimentation following octyl-β-D-glucopyranosideextraction. Caveolin-1 α interacts with caveolin-1 β, caveolin-2, actin,the microsomal form of NADH cytochrome B5 reductase and ESA/reggie-1/flotillin-2as shown by co-immunoprecipitation. We propose the concept that ATP biosynthesisin caveolae regulates mechanosignaling and is induced by membrane depolarizationand a proton gradient. Pressure stimuli and metabolic changes may trigger generegulation in endothelial cells, involving a nuclear conformer of caveolin-1,shown here with an epitope-specific caveolin-1 antibody, and immediate responseof ion channel activity, regulated by ESA/reggie-1/flotillin-2 |
