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Open Access item G protein-coupled receptor systems and their lipid environment in health disorders during aging

Authors:Alemany, R.
Perona, Javier S.
Sánchez-Domínguez, José M.
Montero, Emilio
Cañizares, Julio
Bressani, Ricardo
Escribá, Pablo V.
Ruiz-Gutiérrez, Valentina
Keywords:G protein-coupled receptor, Aging, Human pathology, Signaling protein, Lipid membrane composition, Fatty acid
Issue Date:Apr-2007
Citation:Biochimica et Biophysica Acta - Biomembranes 1768(4): 964-975 (2012)
Abstract:Cells, tissues and organs undergo phenotypic changes and deteriorate as they age. Cell growth arrest and hyporesponsiveness to extrinsic stimuli are all hallmarks of senescent cells. Most such external stimuli received by a cell are processed by two different cell membrane systems: receptor tyrosine kinases (RTKs) and G protein-coupled receptors (GPCRs). GPCRs form the largest gene family in the human genome and they are involved in most relevant physiological functions. Given the changes observed in the expression and activity of GPCRs during aging, it is possible that these receptors are directly involved in aging and certain age-related pathologies. On the other hand, both GPCRs and G proteins are associated with the plasma membrane and since lipid–protein interactions regulate their activity, they can both be considered to be sensitive to the lipid environment. Changes in membrane lipid composition and structure have been described in aged cells and furthermore, these membrane changes have been associated with alterations in GPCR mediated signaling in some of the main health disorders in elderly subjects. Although senescence could be considered a physiologic process, not all aging humans develop the same health disorders. Here, we review the involvement of GPCRs and their lipid environment in the development of the major human pathologies associated with aging such as cancer, neurodegenerative disorders and cardiovascular pathologies.
Publisher version (URL):http://dx.doi.org/10.1016/j.bbamem.2006.09.024
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