Increased hepatic PDGF-AA signaling mediates liver insulin resistance in obesity associated type 2 diabetes

Type 2 diabetes (T2D) is closely linked with non-alcoholic fatty liver disease (NAFLD) and hepatic insulin resistance, but the involved mechanisms are still elusive. Using DNA methylome and transcriptome analyses of livers from obese individuals, we found that both hypomethylation at a CpG site in P...

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Hauptverfasser: Abderrahmani, Amar, Yengo, Loic, Caiazzo, Robert, Canouil, Mickael, Cauchi, Stephane, Raverdy, Violeta, Plaisance, Valerie, Pawlowski, Valerie, Lobbens, Stephane, Maillet, Julie, Rolland, Laure, Boutry, Raphael, Queniat, Gurvan, Kwapich, Maxime, Tenenbaum, Mathie, Bricambert, Julien, Saussenthaler, Sophie, Anthony, Elodie, Jha, Pooja, Derop, Julien, Sand, Olivier, Rabearivelo, Iandry, Leloire, Audrey, Pigeyre, Marie, Daujat-Chavanieu, Martine, Gerbal-Chaloin, Sabine, Dayeh, Tasnim, Lassailly, Guillaume, Mathurin, Philippe, Staels, Bart, Auwerx, Johan, Schurmann, Annette, Postic, Catherine, Schafmayer, Clemens, Hampe, Jochen, Bonnefond, Amelie, Pattou, Francois, Froguel, Philippe
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creator Abderrahmani, Amar
Yengo, Loic
Caiazzo, Robert
Canouil, Mickael
Cauchi, Stephane
Raverdy, Violeta
Plaisance, Valerie
Pawlowski, Valerie
Lobbens, Stephane
Maillet, Julie
Rolland, Laure
Boutry, Raphael
Queniat, Gurvan
Kwapich, Maxime
Tenenbaum, Mathie
Bricambert, Julien
Saussenthaler, Sophie
Anthony, Elodie
Jha, Pooja
Derop, Julien
Sand, Olivier
Rabearivelo, Iandry
Leloire, Audrey
Pigeyre, Marie
Daujat-Chavanieu, Martine
Gerbal-Chaloin, Sabine
Dayeh, Tasnim
Lassailly, Guillaume
Mathurin, Philippe
Staels, Bart
Auwerx, Johan
Schurmann, Annette
Postic, Catherine
Schafmayer, Clemens
Hampe, Jochen
Bonnefond, Amelie
Pattou, Francois
Froguel, Philippe
description Type 2 diabetes (T2D) is closely linked with non-alcoholic fatty liver disease (NAFLD) and hepatic insulin resistance, but the involved mechanisms are still elusive. Using DNA methylome and transcriptome analyses of livers from obese individuals, we found that both hypomethylation at a CpG site in PDGFA (encoding platelet derived growth factor alpha) and PDGFA overexpression are associated with increased T2D risk, hyperinsulinemia, increased insulin resistance and increased steatohepatitis risk. Both genetic risk score studies and human cell modeling pointed to a causative impact of high insulin levels on PDGFA CpG site hypomethylation, PDGFA overexpression, and increased PDGF-AA secretion from liver. We found that PDGF-AA secretion further stimulates its own expression through protein kinase C activity and contributes to insulin resistance through decreased expression of both insulin receptor substrate 1 and of insulin receptor. Importantly, hepatocyte insulin sensitivity can be restored by PDGF-AA blocking antibodies, PDGF receptor inhibitors and by metformin opening therapeutic avenues. Conclusion: Therefore, in the liver of obese patients with T2D, the increased PDGF-AA signaling contributes to insulin resistance, opening new therapeutic avenues against T2D and NAFLD.
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Using DNA methylome and transcriptome analyses of livers from obese individuals, we found that both hypomethylation at a CpG site in PDGFA (encoding platelet derived growth factor alpha) and PDGFA overexpression are associated with increased T2D risk, hyperinsulinemia, increased insulin resistance and increased steatohepatitis risk. Both genetic risk score studies and human cell modeling pointed to a causative impact of high insulin levels on PDGFA CpG site hypomethylation, PDGFA overexpression, and increased PDGF-AA secretion from liver. We found that PDGF-AA secretion further stimulates its own expression through protein kinase C activity and contributes to insulin resistance through decreased expression of both insulin receptor substrate 1 and of insulin receptor. Importantly, hepatocyte insulin sensitivity can be restored by PDGF-AA blocking antibodies, PDGF receptor inhibitors and by metformin opening therapeutic avenues. Conclusion: Therefore, in the liver of obese patients with T2D, the increased PDGF-AA signaling contributes to insulin resistance, opening new therapeutic avenues against T2D and NAFLD.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><oa>free_for_read</oa></addata></record>
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subjects Antibodies
Deoxyribonucleic acid
Diabetes
Diabetes mellitus
DNA
Growth factors
Insulin
Insulin resistance
Kinases
Liver
Metformin
Proteins
Risk
Signaling
Substrates
title Increased hepatic PDGF-AA signaling mediates liver insulin resistance in obesity associated type 2 diabetes
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