Modified high-density lipoprotein modulates aldosterone release through scavenger receptors via extra cellular signal-regulated kinase and Janus kinase-dependent pathways

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Patients with type 2 diabetes (T2D) manifest significant abnormalities in lipoprotein structure and function. The deleterious impact of oxidative and glycoxidative modifications on HDL-mediated atheroprotective, antiinflammatory, and antioxidative phenomena has been well established. However, the biological effects of modified HDL on adrenal steroidogenesis—which could reveal a pathophysiological link to the overactivity of the renin–angiotensin–aldosterone system and its adverse cardiovascular consequences often observed in T2D—are not well delineated. We studied the role of modified HDL on aldosterone release from adrenocortical carcinoma cells (NCI-H295R). In vitro modifications of native HDL were performed in the presence of glucose for glycoxidized HDL (glycoxHDL) and sodium hypochlorite for oxidized HDL. Angiotensin II (AngII)-sensitized H295R cells were treated with lipoproteins for 24 h, and supernatant was used to measure aldosterone release. Both native and modified HDL augmented the steroid release from AngII-sensitized cells, with glycoxHDL having the greatest impact. Both the modified forms of HDL induced a significant increase in scavenger receptor expression and employed protein kinase C as well as extracellular signal-regulated kinase as downstream effectors of aldosterone release. Native HDL and modified HDL required Janus kinase-2 for combating increased demand in steroidogenesis. Therefore, our data support the hypothesis that diabetes-induced modification of HDL may promote adrenocortical aldosterone secretion via different signal transduction pathways. This significant influence on multiple signaling mechanisms could be targeted for future research to implement novel therapeutic trials.

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The authors thank Martina Kohl, Sigrid Nitzsche, and Eva Schubert for their excellent technical support. This work was supported by the Deutsche Forschungsgemeinschaft (KFO 252 to SRB).

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The authors declare that there is no conflict of interest.

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Correspondence to Sarama Saha.

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Saha, S., Graessler, J., Schwarz, P.E.H. et al. Modified high-density lipoprotein modulates aldosterone release through scavenger receptors via extra cellular signal-regulated kinase and Janus kinase-dependent pathways. Mol Cell Biochem 366, 1–10 (2012) doi:10.1007/s11010-012-1274-2

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  • HDL
  • Aldosterone
  • Glycoxidation
  • Oxidation
  • Mitogen activated protein kinase
  • Janus kinase