Vascular insulin resistance related to endoplasmic reticulum stress in aortas from a rat model of chronic kidney disease

Zhou, Qiu Gen; Fu, Xiao Jing; Xu, Guo; Cao, Wei; Liu, Hong Fa; Nie, Jing; Liang, Min; Hou, Fan Fan

doi:10.1152/ajpheart.00407.2012

Cited by 18 publications

(15 citation statements)

References 55 publications

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“…In the past decade, the ER has been identified as an important regulator of metabolic processes,35 and Gargalovic et al were among the first to directly link ER stress to endothelial disturbances 36. Experimental studies in cultured endothelial cells have demonstrated that chemically induced ER stress causes endothelial dysfunction and insulin resistance 37, 38. Further, a number of studies in animal models have provided additional insights into the molecular mechanisms linking ER stress induction and endothelial dysfunction 39, 40.…”

Section: Discussionmentioning

confidence: 99%

Liraglutide Treatment Reduces Endothelial Endoplasmic Reticulum Stress and Insulin Resistance in Patients With Diabetes Mellitus

Bretón‐Romero

Weisbrod

Feng

et al. 2018

JAHA

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BackgroundPrior studies have shown that nutrient excess induces endoplasmic reticulum (ER) stress in nonvascular tissues from patients with diabetes mellitus (DM). ER stress and the subsequent unfolded protein response may be protective, but sustained activation may drive vascular injury. Whether ER stress contributes to endothelial dysfunction in patients with DM remains unknown.Methods and ResultsTo characterize vascular ER stress, we isolated endothelial cells from 42 patients with DM and 37 subjects without DM. Endothelial cells from patients with DM displayed higher levels of ER stress markers compared with controls without DM. Both the early adaptive response, evidenced by higher phosphorylated protein kinase–like ER eukaryotic initiation factor‐2a kinase and inositol‐requiring ER‐to‐nucleus signaling protein 1 (P=0.02, P=0.007, respectively), and the chronic ER stress response evidenced by higher C/EBPα‐homologous protein (P=0.02), were activated in patients with DM. Higher inositol‐requiring ER‐to‐nucleus signaling protein 1 activation was associated with lower flow–mediated dilation, consistent with endothelial dysfunction (r=0.53, P=0.02). Acute treatment with liraglutide, a glucagon‐like peptide 1 receptor agonist, reduced p‐inositol‐requiring ER‐to‐nucleus signaling protein 1 (P=0.01), and the activation of its downstream target c‐jun N‐terminal kinase (P=0.025) in endothelial cells from patients with DM. Furthermore, liraglutide restored insulin‐stimulated endothelial nitric oxide synthase activation in patients with DM (P=0.019).ConclusionsIn summary, our data suggest that ER stress contributes to vascular insulin resistance and endothelial dysfunction in patients with DM. Further, we have demonstrated that liraglutide ameliorates ER stress, decreases c‐jun N‐terminal kinase activation and restores insulin‐mediated endothelial nitric oxide synthase activation in endothelial cells from patients with DM.

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Section: Discussionmentioning

confidence: 99%

Liraglutide Treatment Reduces Endothelial Endoplasmic Reticulum Stress and Insulin Resistance in Patients With Diabetes Mellitus

Bretón‐Romero

Weisbrod

Feng

et al. 2018

JAHA

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“…Consistent with in vitro data, ATX or ATX/Alo treatment did not change the serum ET‐1 levels. A recent study revealing the relationship between nondiabetic chronic kidney disease and vascular insulin resistance suggested the involvement of ER stress in the aorta (35). The potential for relatively low concentrations of uric acid to induce ER stress in rat glomerular mesangial cells displays many similarities to the findings of the present study (36).…”

Section: Discussionmentioning

confidence: 99%

Uric acid induces endothelial dysfunction by vascular insulin resistance associated with the impairment of nitric oxide synthesis

et al. 2014

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Endothelial dysfunction is defined as impairment of the balance between endothelium-dependent vasodilation and constriction. Despite evidence of uric acid-induced endothelial dysfunction, a relationship with insulin resistance has not been clearly established. In this study, we investigated the role of vascular insulin resistance in uric acid-induced endothelial dysfunction. Uric acid inhibited insulin-induced endothelial nitric oxide synthase (eNOS) phosphorylation and NO production more substantially than endothelin-1 expression in HUVECs, with IC50 of 51.0, 73.6, and 184.2, respectively. Suppression of eNOS phosphorylation and NO production by uric acid was PI3K/Akt-dependent, as verified by the transfection with p110. Treatment of rats with the uricase inhibitor allantoxanamide induced mild hyperuricemia and increased mean arterial pressure by 25%. While hyperuricemic rats did not show systemic insulin resistance, they showed impaired vasorelaxation induced by insulin by 56%. A compromised insulin response in terms of the Akt/eNOS pathway was observed in the aortic ring of hyperuricemic rats. Coadministration with allopurinol reduced serum uric acid levels and blood pressure and restored the effect of insulin on Akt-eNOS pathway and vasorelaxation. Taken together, uric acid induced endothelial dysfunction by contributing to vascular insulin resistance in terms of insulin-induced NO production, potentially leading to the development of hypertension.-Choi, Y.-J., Yoon, Y., Lee, K.-Y., Hien, T. T., Kang, K. W., Kim, K.-C., Lee, J., Lee, M.-Y., Lee, S. M., Kang, D.-H., Lee, B.-H. Uric acid induces endothelial dysfunction by vascular insulin resistance associated with the impairment of nitric oxide synthesis.

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“…This information suggests that ER stress may be one key pathway leading to metabolic disease states. Although ER stress has been demonstrated in the kidney [17] and aorta [18] in the context of CKD, whether In the present study, we tested the hypothesis that the inhibition of ER stress could alleviate lipolysis in white adipose tissue under the conditions of CKD. Our data showed that ER stress was activated and lipolysis was enhanced in visceral white adipose tissue in rats with reduced renal mass (RRM), a model of CKD.…”

Section: Introductionmentioning

confidence: 89%

The effect of inhibition of endoplasmic reticulum stress on lipolysis in white adipose tissue in a rat model of chronic kidney disease

et al. 2014

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Aim: Lipolysis in fat tissue plays an important role in the development of metabolic disturbances, a characteristic feature of chronic kidney disease (CKD). In the present study, we tested the hypothesis that the inhibition of endoplasmic reticulum (ER) stress could alleviate lipolysis in white adipose tissue in a rat model of CKD. Methods: A rat model of CKD was established by a method of reduced renal mass (RRM). Lipolysis was measured as the release of glycerol in ex vivo fat pads and cultured primary adipocytes. The activity of lipases and markers of ER stress were measured by Western blotting and immunoprecipitation. Results: Our data showed that lipolysis in visceral white adipose tissue was increased in RRM rats compared with control rats. In addition, increased phosphorylation of hormone-sensitive lipase (HSL) and binding of adipose triglyceride lipase (ATGL) to comparative gene identification-58 (CGI-58) protein were observed in the RRM rats. The phosphorylation of ER stress markers, including IRE1α, PERK, and eukaryotic initiation factor (eIF) 2α, and the expression of ER stress marker 78 kDa glucose-regulated protein (GRP78) were significantly increased in RRM rats. Treatment with an inhibitor of ER stress partially but significantly alleviated lipolysis, and this alleviation was accompanied by reduced binding of ATGL to CGI-58. Conclusion: Our results showed that enhanced lipolysis and ER stress occurred in visceral white adipose tissue in a rat model of CKD. Moreover, inhibition of ER stress significantly alleviated lipolysis. These findings suggest that ER stress is a potential therapeutic target for the metabolic disturbances associated with CKD.

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Vascular insulin resistance related to endoplasmic reticulum stress in aortas from a rat model of chronic kidney disease

Cited by 18 publications

References 55 publications

Liraglutide Treatment Reduces Endothelial Endoplasmic Reticulum Stress and Insulin Resistance in Patients With Diabetes Mellitus

Liraglutide Treatment Reduces Endothelial Endoplasmic Reticulum Stress and Insulin Resistance in Patients With Diabetes Mellitus

Uric acid induces endothelial dysfunction by vascular insulin resistance associated with the impairment of nitric oxide synthesis

The effect of inhibition of endoplasmic reticulum stress on lipolysis in white adipose tissue in a rat model of chronic kidney disease

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