Expression of concern for

• Effect of captopril, losartan, and bradykinin on early steps of insulin action.

  Carvalho CR, Thirone AC, Gontijo JA, Velloso LA, Saad MJ. Carvalho CR, et al. Diabetes. 1997 Dec;46(12):1950-7. doi: 10.2337/diab.46.12.1950. Diabetes. 1997. Retraction in: Diabetes. 2016 Apr;65(4):1128. doi: 10.2337/db16-rt04c. PMID: 9392479 Retracted.
• Exercise improves insulin and leptin sensitivity in hypothalamus of Wistar rats.

  Flores MB, Fernandes MF, Ropelle ER, Faria MC, Ueno M, Velloso LA, Saad MJ, Carvalheira JB. Flores MB, et al. Diabetes. 2006 Sep;55(9):2554-61. doi: 10.2337/db05-1622. Diabetes. 2006. Retraction in: Diabetes. 2016 Apr;65(4):1127-8. doi: 10.2337/db16-rt04b. PMID: 16936204 Retracted.
• Loss-of-function mutation in Toll-like receptor 4 prevents diet-induced obesity and insulin resistance.

  Tsukumo DM, Carvalho-Filho MA, Carvalheira JB, Prada PO, Hirabara SM, Schenka AA, Araújo EP, Vassallo J, Curi R, Velloso LA, Saad MJ. Tsukumo DM, et al. Diabetes. 2007 Aug;56(8):1986-98. doi: 10.2337/db06-1595. Epub 2007 May 22. Diabetes. 2007. Retraction in: Diabetes. 2016 Apr;65(4):1126-7. doi: 10.2337/db16-rt04a. PMID: 17519423 Retracted.
• Physical exercise reduces circulating lipopolysaccharide and TLR4 activation and improves insulin signaling in tissues of DIO rats.

  Oliveira AG, Carvalho BM, Tobar N, Ropelle ER, Pauli JR, Bagarolli RA, Guadagnini D, Carvalheira JB, Saad MJ. Oliveira AG, et al. Diabetes. 2011 Mar;60(3):784-96. doi: 10.2337/db09-1907. Epub 2011 Jan 31. Diabetes. 2011. Retraction in: Diabetes. 2016 Apr;65(4):1124-5. doi: 10.2337/db16-rt04. PMID: 21282367 Free PMC article. Retracted.