Ablation of calcineurin Aβ reveals hyperlipidemia and signaling cross-talks with phosphodiesterases.

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  • Additional Information
    • Source:
      Publisher: Elsevier Inc. on behalf of American Society for Biochemistry and Molecular Biology Country of Publication: United States NLM ID: 2985121R Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1083-351X (Electronic) Linking ISSN: 00219258 NLM ISO Abbreviation: J Biol Chem Subsets: MEDLINE
    • Publication Information:
      Publication: 2021- : [New York, NY] : Elsevier Inc. on behalf of American Society for Biochemistry and Molecular Biology
      Original Publication: Baltimore, MD : American Society for Biochemistry and Molecular Biology
    • Subject Terms:
    • Abstract:
      Insulin resistance, hyperlipidemia, and cardiovascular complications are common dysregulations of metabolic syndrome. Transplant patients treated with immunosuppressant drugs such as cyclosporine A (CsA), an inhibitor of calcineurin phosphatase, frequently develop similar metabolic complications. Although calcineurin is known to mediate insulin sensitivity by regulating β-cell growth and adipokine gene transcription, its role in lipid homeostasis is poorly understood. Here, we examined lipid homeostasis in mice lacking calcineurin Aβ (CnAβ(-/-)). We show that mice lacking calcineurin Aβ are hyperlipidemic and develop age-dependent insulin resistance. Hyperlipidemia found in CnAβ(-/-) mice is, in part, due to increased lipolysis in adipose tissues, a process mediated by β-adrenergic G-protein-coupled receptor signaling pathways. CnAβ(-/-) mice also exhibit additional pathophysiological phenotypes caused by the potentiated GPCR signaling pathways. A cell autonomous mechanism with sustained cAMP/PKA activation is found in CnAβ(-/-) mice or upon CsA treatment to inhibit calcineurin. Increased PKA activation and cAMP accumulation in CnAβ(-/-) mice, however, are sensitive to phosphodiesterase inhibitor. Indeed, we show that calcineurin regulates degradation of phosphodiesterase 3B, in addition to phosphodiesterase 4D. These results establish a role for calcineurin in lipid homeostasis. These data also indicate that potentiated cAMP signaling pathway may provide an alternative molecular pathogenesis for the metabolic complications elicited by CsA in transplant patients.
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    • Grant Information:
      R21 AI082501 United States AI NIAID NIH HHS; United States HHMI Howard Hughes Medical Institute; 5T32 GM07491 United States GM NIGMS NIH HHS; T32 GM007288 United States GM NIGMS NIH HHS; T32 GM007491 United States GM NIGMS NIH HHS; R01 DK090481 United States DK NIDDK NIH HHS
    • Accession Number:
      0 (Phosphodiesterase Inhibitors)
      0 (Receptors, Adrenergic, beta)
      0 (Triglycerides)
      83HN0GTJ6D (Cyclosporine)
      E0399OZS9N (Cyclic AMP)
      EC 2.7.11.11 (Cyclic AMP-Dependent Protein Kinases)
      EC 3.1.3.16 (Calcineurin)
      EC 3.1.3.16 (protein phosphatase 3, catalytic subunit, beta isoform, mouse)
      EC 3.1.4.17 (Cyclic Nucleotide Phosphodiesterases, Type 3)
      EC 3.1.4.17 (Cyclic Nucleotide Phosphodiesterases, Type 4)
    • Publication Date:
      Date Created: 20121222 Date Completed: 20130328 Latest Revision: 20240630
    • Publication Date:
      20240630
    • Accession Number:
      PMC3561567
    • Accession Number:
      10.1074/jbc.M112.419150
    • Accession Number:
      23258544