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Renal tumours in a Tsc1+/- mouse model show epigenetic suppression of organic cation transporters Slc22a1, Slc22a2 and Slc22a3, and do not respond to metformin

Yang, Jian ORCID:, Kalogerou, M., Gallacher, John ORCID:, Sampson, Julian ORCID: and Shen, Ming ORCID: 2013. Renal tumours in a Tsc1+/- mouse model show epigenetic suppression of organic cation transporters Slc22a1, Slc22a2 and Slc22a3, and do not respond to metformin. European Journal of Cancer 49 (6) , pp. 1479-1490. 10.1016/j.ejca.2012.10.027

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Metformin, a substrate of several poly-specific organic cation transporters, is a widely used biguanide for the treatment of type II diabetes. Recent studies suggest that metformin attenuates mTORC1 signalling by the activation of 5' adenosine monophosphate-activated protein kinase (AMPK) in the presence or absence of a functional hamartin/tuberin (TSC1/TSC2) complex. Metformin has also been reported to inhibit mTORC1 independent of AMPK through p53-dependent regulated in development and DNA damage responses 1 (REDD1) or by inhibiting Rag GTPases. These observations suggest that metformin could have therapeutic potential for tuberous sclerosis, an inherited disorder characterised by the aberrant activation of mTORC1 and the development of tumours in many organs, including the kidneys. In this study, we investigated the effect of metformin on renal lesions in a Tsc1+/- mouse model of tuberous sclerosis. Continuous treatment of metformin for 9 months at doses of up to 600 mg/kg/day had no significant effect on renal lesions in nine treated mice compared to 10 controls. Metformin treatment appeared to attenuate mTORC1 signalling in Tsc1+/- kidney tissues but not in renal tumours. Surprisingly, the expression of the organic cation transporters Slc22a1, Slc22a2 and Slc22a3 essential for the cellular uptake of metformin was highly suppressed in renal tumours. Treatment of cultured cells derived from a Tsc1-associated renal tumour with 5-aza-2-deoxycytidine or trichostatin A greatly increased the expression of these genes. These data suggest that the epigenetic suppression of the organic cation transporters in Tsc-associated mouse renal tumours may contribute to the lack of response to metformin treatment.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Systems Immunity Research Institute (SIURI)
Subjects: R Medicine > R Medicine (General)
R Medicine > RZ Other systems of medicine
Uncontrolled Keywords: AMPK;Kidney;Metformin; Mousemodel;mTORC1;Tuberoussclerosis Animals;Azacitidine;BlottingWestern;Catecholamine Plasma Membrane Transport Proteins;Disease Models Animal;Epigenesis, Genetic;Gene Expression Regulation, Neoplastic;Histone Deacetylases;Hypoglycemic Agents; Immunohistochemistry;Kidney;Kidney Neoplasms;Metformin; Mice;Mice Knockout;Multiprotein Complexes;Organic Cation Transport Proteins;Reverse Transcriptase Polymerase Chain Reaction;Signal Transduction;TOR Serine-Threonine Kinases;Tuberous Sclerosis;Tumor Cells Cultured;Tumor Suppressor Proteins animal cell;animal cell culture;animal experiment;animal model;animal tissue;article;controlled study;drug effect; epigenetic repression;kidney injury;mouse;nonhuman; priority journal;protein expression;signaltransduction;treatment duration;treatment response;tuberous sclerosis 5 aza 2' deoxycytidine; metformin; organic cation transporter 1;organic cation transporter 2;organic cation transporter 3;trichostatin A
Publisher: Elsevier
ISSN: 0959-8049
Last Modified: 28 Oct 2022 09:17

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