RLIP76-Mediated Mechanisms in Cancer Cell Biology

RLIP76 (Ral-interacting protein of 76 kDa) is a multifunctional effector that bridges Ral GTPase signalling to Rho family GTPases and serves as a major transporter in the mercapturic acid pathway. Structurally, RLIP76 contains domains for Ral binding, a GTPase-activating protein region for Rac1 and Cdc42, and membrane-association motifs that facilitate its role in endocytosis, cytoskeletal remodelling and vesicular transport. In cancer cells, RLIP76 orchestrates a spectrum of processes critical for tumour progression: it regulates cell survival via PI3K/Akt and MAPK cascades, modulates cell cycle dynamics through interactions with cyclin-dependent kinases, and governs apoptosis by controlling intracellular levels of pro-apoptotic lipid peroxidation products. Its transporter function confers resistance to chemotherapy by catalysing the efflux of glutathione-conjugated drugs, while its impact on angiogenesis involves regulation of VEGF and HIF-1α. RLIP76 also localises to mitotic structures, where it contributes to centrosome dynamics and the mitotic switch-off of endocytosis. Together, these roles underline RLIP76 as a nodal regulator of proliferation, migration, vascularisation and therapeutic response, making it an attractive target for novel anti-cancer strategies.

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Technical terms

RLIP76: A 76 kDa Ral-interacting protein with GTPase-activating and glutathione-conjugate transport activities that regulates cell signalling, vesicular trafficking and drug efflux.

GTPase: An enzyme that binds and hydrolyses guanosine triphosphate, acting as a molecular switch in intracellular signalling pathways.

Mercapturic acid pathway: A detoxification route whereby electrophilic compounds are conjugated to glutathione and exported from cells via specialised transporters.

PI3K/Akt pathway: A key intracellular signalling cascade that promotes cell proliferation, survival and metabolic regulation in normal and cancer cells.

Drug efflux transporter: Membrane protein that actively exports chemotherapeutic agents from cells, reducing intracellular drug accumulation and contributing to resistance.

References

1. Bridging Ral GTPase to Rho Pathways RLIP76, A Ral EFFECTOR WITH CDC42/Rac GTPase-ACTIVATING PROTEIN ACTIVITY (∗). Journal of Biological Chemistry (1995).
2. Accelerated Metabolism and Exclusion of 4-Hydroxynonenal through Induction of RLIP76 and hGST5.8 Is an Early Adaptive Response of Cells to Heat and Oxidative Stress*. Journal of Biological Chemistry (2001).
3. RLIP, an Effector of the Ral GTPases, Is a Platform for Cdk1 to Phosphorylate Epsin during the Switch Off of Endocytosis in Mitosis*. Journal of Biological Chemistry (2003).
4. RLIP76 Regulates PI3K/Akt Signaling and Chemo-Radiotherapy Resistance in Pancreatic Cancer. PLOS ONE (2012).
5. 2’-Hydroxyflavanone effectively targets RLIP76-mediated drug transport and regulates critical signaling networks in breast cancer. Oncotarget (2018).