60kDa lysophospholipase, a new Sgk1 molecular partner involved in the regulation of ENaC

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Abstract

The serum- and glucocorticoid-regulated kinase (Sgk1) is essential for hormonal regulation of ENaC-mediated sodium transport and is involved in the transduction of growth-factor-dependent cell survival and proliferation. The identification of molecular partners for Sgk1 is crucial for the understanding of its mechanisms of action. We performed a yeast two-hybrid screening based on a human kidney cDNA library to identify molecular partners of Sgk1. As a result the screening revealed a specific interaction between Sgk1 and a 60 kDa Lysophospholipase (LysoLP). LysoLP is a poorly characterized enzyme that, based on sequence analysis, might possess lysophospholipase and asparaginase activities. We demonstrate that LysoLP has indeed a lysophospholipase activity and affects metabolic functions related to cell proliferation and regulation of membrane channels. Moreover we demonstrate in the Xenopus oocyte expression system that LysoLP downregulates basal and Sgk1-dependent ENaC activity. In conclusion LysoLP may represent a new player in the regulation of ENaC and Sgk1-dependent signaling. © 2010 S. Karger AG Basel.

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Menniti, M., Iuliano, R., Föller, M., Sopjani, M., Alesutan, I., Mariggiò, S., … Perrotti, N. (2010). 60kDa lysophospholipase, a new Sgk1 molecular partner involved in the regulation of ENaC. Cellular Physiology and Biochemistry, 26(4–5), 587–596. https://doi.org/10.1159/000322326

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