Key points are not available for this paper at this time.
Many proinflammatory cytokines and hormones have been demonstrated to be involved in insulin resistance. However, the molecular mechanisms whereby these cytokines and hormones inhibit insulin signaling are not completely understood. We observed that several cytokines and hormones that induce insulin resistance also stimulate SOCS3 expression in 3T3-L1 adipocytes and that SOCS3 mRNA is increased in adipose tissue of obese/diabetic mice. We then hypothesized that SOCS3 may mediate cytokine- and hormone-induced insulin resistance. By using SOCS3-deficient adipocytes differentiated from mouse embryonic fibroblasts, we found that SOCS3 deficiency increases insulin-stimulated IRS1 and IRS2 phosphorylation, IRS-associated phosphatidylinositol 3-kinase activity, and insulin-stimulated glucose uptake. Moreover, lack of SOCS3 substantially limits the inhibitory effects of tumor to IRS1 and IRS2 phosphorylation, phosphatidylinositol 3-kinase activity, and glucose in insulin signaling in SOCS3-deficient adipocytes is to the of tumor IRS1 and IRS2 that SOCS3 expression is of insulin signaling and is molecular of insulin resistance in We that SOCS3 in insulin resistance and may be in insulin resistance and Many proinflammatory cytokines and hormones have been demonstrated to be involved in insulin resistance. However, the molecular mechanisms whereby these cytokines and hormones inhibit insulin signaling are not completely understood. We observed that several cytokines and hormones that induce insulin resistance also stimulate SOCS3 expression in 3T3-L1 adipocytes and that SOCS3 mRNA is increased in adipose tissue of obese/diabetic mice. We then hypothesized that SOCS3 may mediate cytokine- and hormone-induced insulin resistance. By using SOCS3-deficient adipocytes differentiated from mouse embryonic fibroblasts, we found that SOCS3 deficiency increases insulin-stimulated IRS1 and IRS2 phosphorylation, IRS-associated phosphatidylinositol 3-kinase activity, and insulin-stimulated glucose uptake. Moreover, lack of SOCS3 substantially limits the inhibitory effects of tumor to IRS1 and IRS2 phosphorylation, phosphatidylinositol 3-kinase activity, and glucose in insulin signaling in SOCS3-deficient adipocytes is to the of tumor IRS1 and IRS2 that SOCS3 expression is of insulin signaling and is molecular of insulin resistance in We that SOCS3 in insulin resistance and may be in insulin resistance and resistance is of the of and resistance is also of the the is proinflammatory cytokines of proinflammatory cytokines in been to insulin resistance tumor mouse embryonic of signaling tumor mouse embryonic of signaling is to insulin resistance in of adipose tissue been in and and been to insulin resistance the of proinflammatory cytokines in insulin resistance the molecular mechanisms whereby cytokines inhibit insulin signaling are cytokines stimulate the expression of of signaling of signaling to signaling and to and and to the signaling to of mRNA and in inhibit signaling to to signaling inhibit signaling of signaling from have SOCS3 of in signaling that SOCS3 may in have also demonstrated that SOCS3 is of insulin signaling of IRS1 and IRS2 SOCS3 of insulin signaling SOCS3 expression using is the of SOCS3 in insulin signaling in to the of SOCS3 in the of insulin signaling and insulin resistance in to we using adipocytes differentiated from mouse embryonic from We found that SOCS3 deficiency increases insulin-stimulated IRS1 and IRS2 phosphorylation, 3-kinase activity, and to increased insulin-stimulated glucose uptake. Moreover, SOCS3 deficiency of insulin and is to the of IRS1 and IRS2 these that the of SOCS3 expression is of insulin signaling and is of insulin resistance in SOCS3 in and insulin be of and the and SOCS3 and from and IRS2 from and from from and from and from from 3T3-L1 in to and insulin in and then in insulin in the and and from to to and the and been and in of of of of of of of of of and to from and in in of then in and the of to and in to the in and and then in the of then to and from and and using the and to the SOCS3 mRNA using and the mouse are and mouse in the of and to SOCS3 also in of and to the the and SOCS3 mRNA the mRNA and and and in and to and of the and and and then in of from the to and using the using of to to the 3-kinase activity, using to the and differentiated in the insulin from the to the the glucose to in the adipocytes in then in and insulin the glucose of to and the and to of and of from to from are of and then the using is mRNA in of and the of SOCS3 in insulin we SOCS3 mRNA in of obese/diabetic and mice. that SOCS3 mRNA increased in and of and observed in that SOCS3 mRNA expression is increased in adipose tissue of and mRNA and in 3T3-L1 the effects of several hormones and have been to be involved in insulin SOCS3 mRNA expression in 3T3-L1 and that several and cytokines and stimulate SOCS3 mRNA expression in 3T3-L1 and not and insulin of SOCS3 and of SOCS3 mRNA that that of SOCS3 may to the insulin resistance cytokines and of SOCS3 mRNA in 3T3-L1 adipocytes cytokines and 3T3-L1 and differentiated 3T3-L1 adipocytes and then cytokines and and hormones insulin and in in the tissue and SOCS3 mRNA using are of SOCS3-deficient of the in in embryonic we to the of SOCS3 in insulin be differentiated of and and the expression of and SOCS3 expression that SOCS3 mRNA not in SOCS3 expression in that in observed SOCS3 Moreover, SOCS3 mRNA expression in to of SOCS3 mRNA in SOCS3 expression in these are the of SOCS3 in insulin signaling in of SOCS3-deficient of differentiated and and differentiated expression of in differentiated and the expression of SOCS3 in differentiated and SOCS3 from and SOCS3 and SOCS3 mRNA using are adipocytes SOCS3 mRNA in to and then and SOCS3 mRNA using are and in the of SOCS3 deficiency insulin signaling in we insulin-stimulated glucose in differentiated insulin insulin of glucose in adipocytes Moreover, lack of SOCS3 of insulin-stimulated glucose uptake. of adipocytes of insulin-stimulated glucose of glucose in adipocytes adipocytes in insulin-stimulated glucose and of glucose the SOCS3 expression and insulin-stimulated glucose in the and of deficiency increases insulin-stimulated uptake. and differentiated and glucose are and insulin and insulin insulin SOCS3 IRS1 then SOCS3 insulin signaling in that insulin-stimulated of the that SOCS3 deficiency not in these However, insulin-stimulated of IRS1 increased in and and adipocytes that be signaling SOCS3 insulin signaling in deficiency increases insulin-stimulated of SOCS3 deficiency not insulin-stimulated of and insulin and and SOCS3 deficiency increases insulin-stimulated of in using IRS1 is of using are the of to in that of adipocytes insulin-stimulated IRS1 substantially in and the in the of insulin-stimulated IRS1 in and increased in the IRS1 in inhibitory effects IRS1 in and that IRS1 is IRS1 in the that the of IRS1 SOCS3 deficiency may the of of IRS1 in of SOCS3 deficiency IRS1 we the and adipocytes in that IRS1 from to in the and to IRS1 in of IRS1 the of Moreover, of adipocytes completely the of IRS1 observed the of SOCS3 deficiency IRS2 and that SOCS3 is IRS1 and and and may be of insulin deficiency substantially the of to inhibit insulin SOCS3 deficiency substantially of IRS1 and then insulin IRS1 and IRS1 and is of are insulin insulin are insulin SOCS3 deficiency of then and in in the the IRS1 and SOCS3 deficiency substantially the of IRS2 the in using IRS2 are insulin insulin are insulin and of that insulin of that insulin SOCS3 expression in may mediate the of that insulin insulin-stimulated IRS1 in IRS1 of IRS1 and insulin substantially in that insulin of IRS1 in adipocytes and substantially in that SOCS3 in IRS1 insulin and may in the of insulin signaling and insulin resistance in deficiency IRS1 and insulin adipocytes insulin and insulin IRS1 and IRS1 and SOCS3 deficiency of and then insulin in in the the IRS1 and the of SOCS3 deficiency insulin is of and to is of 3-kinase We the of to IRS1 in adipocytes of the insulin IRS1 that insulin-stimulated of to IRS1 increased in of adipocytes the of the SOCS3 deficiency in and adipocytes substantially the of to IRS1 insulin increases in in and adipocytes We the of 3-kinase in the adipocytes of the that insulin of in insulin in and to inhibit insulin-stimulated in in observed the of SOCS3 deficiency that lack of SOCS3 in increased insulin signaling the 3-kinase deficiency increases to IRS1 and 3-kinase SOCS3 deficiency increases to and insulin IRS1 and IRS1 and is of using are insulin SOCS3 deficiency increases 3-kinase and insulin using and 3-kinase are insulin insulin SOCS3 deficiency increases insulin-stimulated in using and have demonstrated in the that SOCS3 mRNA is in adipose tissue of obese/diabetic and that several hormones and cytokines that are to insulin resistance induce expression of SOCS3 in We hypothesized that SOCS3 is of insulin signaling and may mediate cytokine- and hormone-induced insulin resistance in We using SOCS3-deficient We demonstrated that the SOCS3 deficiency increases insulin-stimulated IRS1 and IRS2 and IRS1 and 3-kinase activity, in increased glucose in Moreover, the lack of SOCS3 substantially the inhibitory effects of the of IRS1 and to IRS1 and 3-kinase activity, and glucose in of SOCS3 are SOCS3 SOCS3 expression and the of IRS1 in the insulin signaling in adipocytes is to the of IRS1 and IRS2 the the IRS1 and insulin are to that SOCS3 is of insulin signaling that cytokine- and hormone-induced insulin resistance in from have SOCS3 of signaling SOCS3 is that in and insulin resistance. the expression and of SOCS3 may be of the of and and be several have that SOCS3 insulin signaling in have mechanisms SOCS3 of insulin of the and the insulin SOCS3 to the of the insulin and the of IRS1 the insulin IRS1 and insulin signaling that SOCS3 inhibit insulin signaling IRS1 and IRS2 SOCS3 that IRS1 and IRS2 to and and the mechanisms are and may to the of SOCS3 insulin the of that insulin-stimulated IRS1 and IRS2 is increased in SOCS3-deficient increased is not increased that SOCS3 SOCS3 However, insulin SOCS3 expression is and in and phosphorylation, SOCS3 deficiency substantially the of and SOCS3 may to to of the have also been to inhibit insulin that IRS1 and of insulin-stimulated IRS1 may of in the also been to to and the insulin to insulin signaling Moreover, that also inhibit insulin signaling to the insulin IRS2 that lack of SOCS3 not completely of IRS1 and and is that that the inhibitory effects insulin However, in insulin signaling is the insulin that increased and of adipose tissue and in in adipose in to of proinflammatory cytokines that may to insulin resistance. and have been demonstrated to insulin resistance. been to of to insulin signaling mechanisms whereby cytokines and inhibit insulin signaling We have observed that and stimulate SOCS3 expression and hypothesized that of SOCS3 to insulin resistance. We the of SOCS3 in the of to signaling the effects of cytokines in insulin signaling to be that insulin signaling IRS1 IRS1 SOCS3 of IRS1 and of insulin signaling to and have been demonstrated to induce insulin resistance in adipocytes We that and are of SOCS3 expression in and we that SOCS3 is of the insulin resistance these that insulin IRS1 the that insulin IRS1 in SOCS3 deficiency substantially these that SOCS3 may mediate of insulin to insulin been that insulin insulin resistance in SOCS3 may in insulin resistance in of SOCS3 in insulin resistance is to be We found that SOCS3 mRNA is in of obese/diabetic and increased SOCS3 mRNA and have been in adipose tissue from that to and from that SOCS3 and have insulin is to be of SOCS3 deficiency in and However, to the of SOCS3 in insulin signaling in we to and the SOCS3 in adipose tissue using are in that the of SOCS3 expression is of insulin signaling and in SOCS3 to be in the and in to hormones and cytokines that have the to induce insulin whereby SOCS3 expression is and then the that that is to the of cytokines to may also be of the of SOCS3 the to and insulin and expression is increased in of is in to to the of and resistance is of the of and resistance is also of the the is proinflammatory cytokines of proinflammatory cytokines in been to insulin resistance tumor mouse embryonic of signaling tumor mouse embryonic of signaling is to insulin resistance in of adipose tissue been in and and been to insulin resistance the of proinflammatory cytokines in insulin resistance the molecular mechanisms whereby cytokines inhibit insulin signaling are understood. Many cytokines stimulate the expression of of signaling of signaling to signaling and to and and to the signaling to of mRNA and in inhibit signaling to to signaling inhibit signaling of signaling from have SOCS3 of in signaling that SOCS3 may in have also demonstrated that SOCS3 is of insulin signaling of IRS1 and IRS2 SOCS3 of insulin signaling SOCS3 expression using is the of SOCS3 in insulin signaling in to the of SOCS3 in the of insulin signaling and insulin resistance in to we using adipocytes differentiated from mouse embryonic from We found that SOCS3 deficiency increases insulin-stimulated IRS1 and IRS2 phosphorylation, 3-kinase activity, and to increased insulin-stimulated glucose uptake. Moreover, SOCS3 deficiency of insulin and is to the of IRS1 and IRS2 these that the of SOCS3 expression is of insulin signaling and is of insulin resistance in SOCS3 in and insulin be of and the and SOCS3 and from and IRS2 from and from from and from and from from 3T3-L1 in to and insulin in and then in insulin in the and and from to to and the and been and in of of of of of of of of of and to from and in in of then in and the of to and in to the in and and then in the of then to and from and and using the and to the SOCS3 mRNA using and the mouse are and mouse in the of and to SOCS3 also in of and to the the and SOCS3 mRNA the mRNA and and and in and to and of the and and and then in of from the to and using the using of to to the 3-kinase activity, using to the and differentiated in the insulin from the to the the glucose to in the adipocytes in then in and insulin the glucose of to and the and to of and of from to from are of and then the using is and SOCS3 and from and IRS2 from and from from and from and from from 3T3-L1 in to and insulin in and then in insulin in the and and from to to and the and been and in of of of of of of of of of and to from and in in of then in and the of to and in to the in and and then in the of then to and from and and using the and to the SOCS3 mRNA using and the mouse are and mouse in the of and to SOCS3 also in of and to the the and SOCS3 mRNA the mRNA and and and in and to and of the and and and then in of from the to and using the using of to to the 3-kinase activity, using to the and differentiated in the insulin from the to the the glucose to in the adipocytes in then in and insulin the glucose of to and the and to of and of from to from are of and then the using is mRNA in of and the of SOCS3 in insulin we SOCS3 mRNA in of obese/diabetic and mice. that SOCS3 mRNA increased in and of and observed in that SOCS3 mRNA expression is increased in adipose tissue of and mRNA and in 3T3-L1 the effects of several hormones and have been to be involved in insulin SOCS3 mRNA expression in 3T3-L1 and that several and cytokines and stimulate SOCS3 mRNA expression in 3T3-L1 and not and insulin of SOCS3 and of SOCS3 mRNA that that of SOCS3 may to the insulin resistance cytokines and of SOCS3-deficient of the in in embryonic we to the of SOCS3 in insulin be differentiated of and and the expression of and SOCS3 expression that SOCS3 mRNA not in SOCS3 expression in that in observed SOCS3 Moreover, SOCS3 mRNA expression in to of SOCS3 mRNA in SOCS3 expression in these are the of SOCS3 in insulin signaling in of SOCS3-deficient of differentiated and and differentiated expression of in differentiated and the expression of SOCS3 in differentiated and SOCS3 from and SOCS3 and SOCS3 mRNA using are adipocytes SOCS3 mRNA in to and then and SOCS3 mRNA using are and in the of SOCS3 deficiency insulin signaling in we insulin-stimulated glucose in differentiated insulin insulin of glucose in adipocytes Moreover, lack of SOCS3 of insulin-stimulated glucose uptake. of adipocytes of insulin-stimulated glucose of glucose in adipocytes adipocytes in insulin-stimulated glucose and of glucose the SOCS3 expression and insulin-stimulated glucose in the and of deficiency increases insulin-stimulated uptake. and differentiated and glucose are and insulin and insulin insulin SOCS3 IRS1 then SOCS3 insulin signaling in that insulin-stimulated of the that SOCS3 deficiency not in these However, insulin-stimulated of IRS1 increased in and and adipocytes that be signaling SOCS3 insulin signaling in deficiency increases insulin-stimulated of SOCS3 deficiency not insulin-stimulated of and insulin and and SOCS3 deficiency increases insulin-stimulated of in using IRS1 is of using are the of to in that of adipocytes insulin-stimulated IRS1 substantially in and the in the of insulin-stimulated IRS1 in and increased in the IRS1 in inhibitory effects IRS1 in and that IRS1 is IRS1 in the that the of IRS1 SOCS3 deficiency may the of of IRS1 in of SOCS3 deficiency IRS1 we the and adipocytes in that IRS1 from to in the and to IRS1 in of IRS1 the of Moreover, of adipocytes completely the of IRS1 observed the of SOCS3 deficiency IRS2 and that SOCS3 is IRS1 and and and may be of insulin deficiency substantially the of to inhibit insulin SOCS3 deficiency substantially of IRS1 and then insulin IRS1 and IRS1 and is of are insulin insulin are insulin SOCS3 deficiency of then and in in the the IRS1 and SOCS3 deficiency substantially the of IRS2 the in using IRS2 are insulin insulin are insulin and of that insulin of that insulin SOCS3 expression in may mediate the of that insulin insulin-stimulated IRS1 in IRS1 of IRS1 and insulin substantially in that insulin of IRS1 in adipocytes and substantially in that SOCS3 in IRS1 insulin and may in the of insulin signaling and insulin resistance in deficiency IRS1 and insulin adipocytes insulin and insulin IRS1 and IRS1 and SOCS3 deficiency of and then insulin in in the the IRS1 and the of SOCS3 deficiency insulin is of and to is of 3-kinase We the of to IRS1 in adipocytes of the insulin IRS1 that insulin-stimulated of to IRS1 increased in of adipocytes the of the SOCS3 deficiency in and adipocytes substantially the of to IRS1 insulin increases in in and adipocytes We the of 3-kinase in the adipocytes of the that insulin of in insulin in and to inhibit insulin-stimulated in in observed the of SOCS3 deficiency that lack of SOCS3 in increased insulin signaling the 3-kinase deficiency increases to IRS1 and 3-kinase SOCS3 deficiency increases to and insulin IRS1 and IRS1 and is of using are insulin SOCS3 deficiency increases 3-kinase and insulin using and 3-kinase are insulin insulin SOCS3 deficiency increases insulin-stimulated in using and SOCS3 mRNA in of and the of SOCS3 in insulin we SOCS3 mRNA in of obese/diabetic and mice. that SOCS3 mRNA increased in and of and observed in that SOCS3 mRNA expression is increased in adipose tissue of and SOCS3 mRNA and in 3T3-L1 the effects of several hormones and have been to be involved in insulin SOCS3 mRNA expression in 3T3-L1 and that several and cytokines and stimulate SOCS3 mRNA expression in 3T3-L1 and not and insulin of SOCS3 and of SOCS3 mRNA that that of SOCS3 may to the insulin resistance cytokines and of SOCS3-deficient of the in in embryonic we to the of SOCS3 in insulin be differentiated of and and the expression of and SOCS3 expression that SOCS3 mRNA not in SOCS3 expression in that in observed SOCS3 Moreover, SOCS3 mRNA expression in to of SOCS3 mRNA in SOCS3 expression in these are the of SOCS3 in insulin signaling in SOCS3 in the of SOCS3 deficiency insulin signaling in we insulin-stimulated glucose in differentiated insulin insulin of glucose in adipocytes Moreover, lack of SOCS3 of insulin-stimulated glucose uptake. of adipocytes of insulin-stimulated glucose of glucose in adipocytes adipocytes in insulin-stimulated glucose and of glucose the SOCS3 expression and insulin-stimulated glucose in the and of SOCS3 IRS1 then SOCS3 insulin signaling in that insulin-stimulated of the that SOCS3 deficiency not in these However, insulin-stimulated of IRS1 increased in and and adipocytes that be signaling SOCS3 insulin signaling in SOCS3 the of to in that of adipocytes insulin-stimulated IRS1 substantially in and the in the of insulin-stimulated IRS1 in and increased in the IRS1 in inhibitory effects IRS1 in and that IRS1 is IRS1 in the that the of IRS1 SOCS3 deficiency may the of of IRS1 in of SOCS3 deficiency IRS1 we the and adipocytes in that IRS1 from to in the and to IRS1 in of IRS1 the of Moreover, of adipocytes completely the of IRS1 observed the of SOCS3 deficiency IRS2 and that SOCS3 is IRS1 and and and may be of insulin SOCS3 and of that insulin of that insulin SOCS3 expression in may mediate the of that insulin insulin-stimulated IRS1 in IRS1 of IRS1 and insulin substantially in that insulin of IRS1 in adipocytes and substantially in that SOCS3 in IRS1 insulin and may in the of insulin signaling and insulin resistance in SOCS3 and the of SOCS3 deficiency insulin is of and to is of 3-kinase We the of to IRS1 in adipocytes of the insulin IRS1 that insulin-stimulated of to IRS1 increased in of adipocytes the of the SOCS3 deficiency in and adipocytes substantially the of to IRS1 insulin increases in in and adipocytes We the of 3-kinase in the adipocytes of the that insulin of in insulin in and to inhibit insulin-stimulated in in observed the of SOCS3 deficiency that lack of SOCS3 in increased insulin signaling the 3-kinase have demonstrated in the that SOCS3 mRNA is in adipose tissue of obese/diabetic and that several hormones and cytokines that are to insulin resistance induce expression of SOCS3 in We hypothesized that SOCS3 is of insulin signaling and may mediate cytokine- and hormone-induced insulin resistance in We using SOCS3-deficient We demonstrated that the SOCS3 deficiency increases insulin-stimulated IRS1 and IRS2 and IRS1 and 3-kinase activity, in increased glucose in Moreover, the lack of SOCS3 substantially the inhibitory effects of the of IRS1 and to IRS1 and 3-kinase activity, and glucose in of SOCS3 are SOCS3 SOCS3 expression and the of IRS1 in the insulin signaling in adipocytes is to the of IRS1 and IRS2 the the IRS1 and insulin are to that SOCS3 is of insulin signaling that cytokine- and hormone-induced insulin resistance in from have SOCS3 of signaling SOCS3 is that in and insulin resistance. the expression and of SOCS3 may be of the of and and be several have that SOCS3 insulin signaling in have mechanisms SOCS3 of insulin of the and the insulin SOCS3 to the of the insulin and the of IRS1 the insulin IRS1 and insulin signaling that SOCS3 inhibit insulin signaling IRS1 and IRS2 SOCS3 that IRS1 and IRS2 to and and the mechanisms are and may to the of SOCS3 insulin the of that insulin-stimulated IRS1 and IRS2 is increased in SOCS3-deficient increased is not increased that SOCS3 SOCS3 However, insulin SOCS3 expression is and in and phosphorylation, SOCS3 deficiency substantially the of and SOCS3 may to to of the have also been to inhibit insulin that IRS1 and of insulin-stimulated IRS1 may of in the also been to to and the insulin to insulin signaling Moreover, that also inhibit insulin signaling to the insulin IRS2 that lack of SOCS3 not completely of IRS1 and and is that that the inhibitory effects insulin However, in insulin signaling is the insulin that increased and of adipose tissue and in in adipose in to of proinflammatory cytokines that may to insulin resistance. and have been demonstrated to insulin resistance. been to of to insulin signaling mechanisms whereby cytokines and inhibit insulin signaling We have observed that and stimulate SOCS3 expression and hypothesized that of SOCS3 to insulin resistance. We the of SOCS3 in the of to signaling the effects of cytokines in insulin signaling to be that insulin signaling IRS1 IRS1 SOCS3 of IRS1 and of insulin signaling to and have been demonstrated to induce insulin resistance in adipocytes We that and are of SOCS3 expression in and we that SOCS3 is of the insulin resistance these that insulin IRS1 the that insulin IRS1 in SOCS3 deficiency substantially these that SOCS3 may mediate of insulin to insulin been that insulin insulin resistance in SOCS3 may in insulin resistance in of SOCS3 in insulin resistance is to be We found that SOCS3 mRNA is in of obese/diabetic and increased SOCS3 mRNA and have been in adipose tissue from that to and from that SOCS3 and have insulin is to be of SOCS3 deficiency in and However, to the of SOCS3 in insulin signaling in we to and the SOCS3 in adipose tissue using are in that the of SOCS3 expression is of insulin signaling and in SOCS3 to be in the and in to hormones and cytokines that have the to induce insulin whereby SOCS3 expression is and then the that that is to the of cytokines to may also be of the of SOCS3 the to and insulin and expression is increased in of is in to to the of and We have demonstrated in the that SOCS3 mRNA is in adipose tissue of obese/diabetic and that several hormones and cytokines that are to insulin resistance induce expression of SOCS3 in We hypothesized that SOCS3 is of insulin signaling and may mediate cytokine- and hormone-induced insulin resistance in We using SOCS3-deficient We demonstrated that the SOCS3 deficiency increases insulin-stimulated IRS1 and IRS2 and IRS1 and 3-kinase activity, in increased glucose in Moreover, the lack of SOCS3 substantially the inhibitory effects of the of IRS1 and to IRS1 and 3-kinase activity, and glucose in of SOCS3 are SOCS3 SOCS3 expression and the of IRS1 in the insulin signaling in adipocytes is to the of IRS1 and IRS2 the the IRS1 and insulin are to that SOCS3 is of insulin signaling that cytokine- and hormone-induced insulin resistance in from have SOCS3 of signaling SOCS3 is that in and insulin resistance. the expression and of SOCS3 may be of the of and and be several have that SOCS3 insulin signaling in have mechanisms SOCS3 of insulin of the and the insulin SOCS3 to the of the insulin and the of IRS1 the insulin IRS1 and insulin signaling that SOCS3 inhibit insulin signaling IRS1 and IRS2 SOCS3 that IRS1 and IRS2 to and and the mechanisms are and may to the of SOCS3 insulin the of that insulin-stimulated IRS1 and IRS2 is increased in SOCS3-deficient increased is not increased that SOCS3 SOCS3 However, insulin SOCS3 expression is and in and phosphorylation, SOCS3 deficiency substantially the of and SOCS3 may to to of the have also been to inhibit insulin that IRS1 and of insulin-stimulated IRS1 may of in the also been to to and the insulin to insulin signaling Moreover, that also inhibit insulin signaling to the insulin IRS2 that lack of SOCS3 not completely of IRS1 and and is that that the inhibitory effects insulin However, in insulin signaling is the insulin that increased and of adipose tissue and in in adipose in to of proinflammatory cytokines that may to insulin resistance. and have been demonstrated to insulin resistance. been to of to insulin signaling mechanisms whereby cytokines and inhibit insulin signaling We have observed that and stimulate SOCS3 expression and hypothesized that of SOCS3 to insulin resistance. We the of SOCS3 in the of to signaling the effects of cytokines in insulin signaling to be that insulin signaling IRS1 IRS1 SOCS3 of IRS1 and of insulin signaling to and have been demonstrated to induce insulin resistance in adipocytes We that and are of SOCS3 expression in and we that SOCS3 is of the insulin resistance these that insulin IRS1 the that insulin IRS1 in SOCS3 deficiency substantially these that SOCS3 may mediate of insulin to insulin been that insulin insulin resistance in SOCS3 may in insulin resistance in of SOCS3 in insulin resistance is to be We found that SOCS3 mRNA is in of obese/diabetic and increased SOCS3 mRNA and have been in adipose tissue from that to and from that SOCS3 and have insulin is to be of SOCS3 deficiency in and However, to the of SOCS3 in insulin signaling in we to and the SOCS3 in adipose tissue using are in that the of SOCS3 expression is of insulin signaling and in SOCS3 to be in the and in to hormones and cytokines that have the to induce insulin whereby SOCS3 expression is and then the that that is to the of cytokines to may also be of the of SOCS3 the to and insulin and expression is increased in of is in to to the of and We the and
Shi et al. (Tue,) studied this question.