Abstract
Calcium/calmodulin-dependent protein kinase IV (CaMKIV) has recently emerged as an important regulator of glucose metabolism and vascular function, but the underlying mechanism is not fully understood. Recently, we revealed that CaMKIV limits metabolic disorder and liver insulin resistance and regulates autophagy in high-fat diet-induced obese mice. In the present study, we demonstrated that CaMKIV was not only associated with improvement of glucose tolerance and insulin sensitivity in ob/ob mice but also involved in the regulation of vascular autophagy and mitochondrial biogenesis. Our in vitro data indicated that CaMKIV reversed autophagic imbalance and restored insulin sensitivity in palmitate-induced A7r5 cells with insulin resistance. However, the protective effects of CaMKIV were nullified by suppression of Akt, mTOR, or CREB, suggesting that CaMKIV inhibits autophagy and improves insulin signaling in insulin resistance cell models in an Akt/mTOR/CREB-dependent manner. CaMKIV reversed autophagic imbalance and insulin sensitivity in vascular tissues and vascular cells through Akt/mTOR/CREB signaling, which could be regarded as a novel opportunity for the treatment of insulin resistance.
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Abbreviations
- Akt:
-
Protein kinase B
- Atg7:
-
Autophagy-related 7
- BP:
-
Blood pressure
- CaMKIV:
-
Calcium/calmodulin-dependent protein kinase IV
- CaMK:
-
Ca2+/calmodulin-dependent protein kinase
- CREB:
-
Cyclic AMP response element-binding protein
- CVDs:
-
Cardiovascular diseases
- ERs:
-
Endoplasmic reticulum stress
- FBXW7:
-
F-box and WD repeat domain-containing 7
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- GLUT4:
-
Isotype 4 of the glucose transporter
- GSK-3β:
-
Glycogen synthase kinase 3β
- GTT:
-
Glucose tolerance test
- HFD:
-
High-fat diet
- IgG:
-
Immunoglobulin G
- IL-6:
-
Interleukin-6
- IRS:
-
Insulin receptor substrate
- ITT:
-
Insulin tolerance test
- LC3:
-
Microtubule-associated protein 1 light chain 3
- MCP-1:
-
Monocyte chemoattractant protein-1
- Mfn1:
-
Mitofusin 1
- Mfn2:
-
Mitofusin 2
- mTOR:
-
Mammalian target of rapamycin
- p:
-
Phosphorylated
- NRF-1:
-
Nuclear respiratory factor 1
- PCR:
-
Polymerase chain reaction
- PGC-1α:
-
Peroxisome proliferator-activated receptor γ coactivator-1α
- siRNA:
-
Small interfering RNA
- SIRT1:
-
Silent mating-type information regulation 2 homolog 1
- TFAM:
-
Mitochondrial transcription factor A
- VSMCs:
-
Vascular smooth muscle cells
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Funding
This study was partly supported by funds from the National Natural Science Foundation of China (Program No. 81600619), Natural Science Foundation of Shaanxi Province (No. 708037169021), and the Personal Training Special Fund of the Second Affiliated Hospital of Xi’an Jiaotong University [No. RC (XM) 2016010].
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LJL and LY processed the samples, analyzed and prepared the data, and were involved in drafting the article. LJL, GN, and JJ contributed to data interpretation and revised the article. LJL and HQ designed the experiments, interpreted the data, and were primary responsible for writing the manuscript. All authors approved the final version of the manuscript.
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All animal studies were approved by the Xi’an Jiaotong University laboratory Animal Administration Committee and performed according to the Xi'an Jiaotong University Guidelines for Animal Experimentation.
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Key points
• CaMKIV is associated with improved whole-body glucose metabolism in obese mice.
• CaMKIV restores vascular function through inhibition of autophagy in vivo.
• Effect of CaMKIV on vascular function through Akt/mTOR/CREB pathway.
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Liu, J., Li, Y., Gao, N. et al. Calcium/calmodulin-dependent protein kinase IV regulates vascular autophagy and insulin signaling through Akt/mTOR/CREB pathway in ob/ob mice. J Physiol Biochem 78, 199–211 (2022). https://doi.org/10.1007/s13105-021-00853-6
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DOI: https://doi.org/10.1007/s13105-021-00853-6