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Downregulation of P300/CBP-Associated Factor Protects from Vascular Aging via Nrf2 Signal Pathway Activation. Int J Mol Sci 2022; 23:ijms232012574. [PMID: 36293441 PMCID: PMC9603891 DOI: 10.3390/ijms232012574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 10/11/2022] [Accepted: 10/13/2022] [Indexed: 12/14/2022] Open
Abstract
Increasing evidence has shown that vascular aging has a key role in the pathogenesis of vascular diseases. P300/CBP-associated factor (PCAF) is involved in many vascular pathological processes, but the role of PCAF in vascular aging is unknown. This study aims to explore the role and underlying mechanism of PCAF in vascular aging. The results demonstrated that the expression of PCAF was associated with age and aging, and remarkably increased expression of PCAF was present in human atherosclerotic coronary artery. Downregulation of PCAF could reduce angiotensin II (AngII)-induced senescence of rat aortic endothelial cells (ECs) in vitro. In addition, inhibition of PCAF with garcinol alleviated AngII-induced vascular senescence phenotype in mice. Downregulation of PCAF could alleviate AngII-induced oxidative stress injury in ECs and vascular tissue. Moreover, PCAF and nuclear factor erythroid-2-related factor 2 (Nrf2) could interact directly, and downregulation of PCAF alleviated vascular aging by promoting the activation of Nrf2 and enhancing the expression of its downstream anti-aging factors. The silencing of Nrf2 with small interfering RNA attenuated the protective effect of PCAF downregulation from vascular aging. These findings indicate that downregulation of PCAF alleviates oxidative stress by activating the Nrf2 signaling pathway and ultimately inhibits vascular aging. Thus, PCAF may be a promising target for aging-related cardiovascular disease.
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Shu HY, Peng YZ, Hang WJ, Zhang M, Shen L, Wang DW, Zhou N. Trimetazidine enhances myocardial angiogenesis in pressure overload-induced cardiac hypertrophy mice through directly activating Akt and promoting the binding of HSF1 to VEGF-A promoter. Acta Pharmacol Sin 2022; 43:2550-2561. [PMID: 35217815 PMCID: PMC9525722 DOI: 10.1038/s41401-022-00877-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 01/21/2022] [Indexed: 02/07/2023] Open
Abstract
Latest clinical research shows that trimetazidine therapy during the perioperative period relieves endothelial dysfunction in patients with unstable angina induced by percutaneous coronary intervention. In this study we investigated the effects of TMZ on myocardial angiogenesis in pressure overload-induced cardiac hypertrophy mice. Cardiac hypertrophy was induced in mice by transverse aortic constriction (TAC) surgery. TAC mice were administered trimetazidine (2.8 mg/100 µL, i.g.) for 28 consecutive days. We showed that trimetazidine administration significantly increased blood vessel density in the left ventricular myocardium and abrogated cardiac dysfunction in TAC mice. Co-administration of a specific HSF1 inhibitor KRIBB11 (1.25 mg/100 µL, i.h.) abrogated the angiogenesis-promoting effects of trimetazidine in TAC mice. Using luciferase reporter and electrophoretic mobility shift assays we demonstrated that the transcription factor HSF1 bound to the promoter region of VEGF-A, and the transcriptional activity of HSF1 was enhanced upon trimetazidine treatment. In molecular docking analysis we found that trimetazidine directly bound to Akt via a hydrogen bond with Asp292 and a pi-pi bond with Trp80. In norepinephrine-treated HUVECs, we showed that trimetazidine significantly increased the phosphorylation of Akt and the synergistic nuclear translocation of Akt and HSF1, as well as the binding of Akt and HSF1 in the nucleus. These results suggest that trimetazidine enhances myocardial angiogenesis through a direct interaction with Akt and promotion of nuclear translocation of HSF1, and that trimetazidine may be used for the treatment of myocardial angiogenic disorders in hypertensive patients.
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Affiliation(s)
- Hong-Yang Shu
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
- Hubei Key Laboratory of Genetics and Molecular Mechanism of Cardiologic Disorders, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Yi-Zhong Peng
- Department of Orthopedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Wei-Jian Hang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
- Hubei Key Laboratory of Genetics and Molecular Mechanism of Cardiologic Disorders, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Min Zhang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
- Hubei Key Laboratory of Genetics and Molecular Mechanism of Cardiologic Disorders, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Lan Shen
- Department of Cardiology, Shanghai Chest Hospital Shanghai Jiaotong University, Shanghai, 200030, China
| | - Dao-Wen Wang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
- Hubei Key Laboratory of Genetics and Molecular Mechanism of Cardiologic Disorders, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Ning Zhou
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
- Hubei Key Laboratory of Genetics and Molecular Mechanism of Cardiologic Disorders, Huazhong University of Science and Technology, Wuhan, 430030, China.
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Abstract
The four vertebrate arrestins play a key role in the desensitization and internalization of G protein-coupled receptors (GPCRs) and also mediate receptor-dependent signaling. Recent work has shown that bias for arrestin vs G protein signaling could offer certain therapeutic advantages (or disadvantages) in different systems, making assays that measure arrestin binding to receptors important for drug discovery efforts. Herein, we briefly review several commonly used techniques for measuring arrestin binding to receptors, as well as provide an in-depth and methodologically focused review of two methods that do not require receptor modification. The first approach measures direct binding between purified arrestin and rhodopsin, and the second measures the recruitment of arrestin to receptors in living cells.
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Sustained GRK2-dependent CREB activation is essential for α 2-adrenergic receptor-induced PC12 neuronal differentiation. Cell Signal 2019; 66:109446. [PMID: 31678682 DOI: 10.1016/j.cellsig.2019.109446] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 10/18/2019] [Accepted: 10/21/2019] [Indexed: 12/18/2022]
Abstract
Many aspects of neuronal development, such as neuronal survival and differentiation, are regulated by the transcription factor cAMP-response element-binding protein (CREB). We have previously reported that α2-adrenergic receptors (ARs), members of the G protein-coupled receptor (GPCR) superfamily, induce neuronal differentiation of rat pheochromocytoma (PC)-12 cells in a subtype-specific manner, i.e. α2A<α2B<α2C. Herein, we sought to investigate CREB`s involvement in this α2AR-dependent neurogenic process. We used a combination of gene reporter assays and immunoblotting analysis, coupled with co-immunoprecipitation and morphological analysis, in transfected PC12 cell lines. Chronic α2B- or α2C-AR activation results in sustained CREB activation, which is both necessary and sufficient for neuronal differentiation of PC12 cells expressing these two α2ARs. In contrast, chronic α2A activation only leads to transient CREB activation, insufficient for PC12 neuronal differentiation. However, upon CREB overexpression, α2A-AR triggers neuronal differentiation similarly to α2B- or α2C-ARs. Importantly, NGF (Nerve Growth Factor)`s TrkA receptor transactivation is essential for the sustained activation of CREB by all three α2 subtypes in PC12 cells, whereas protein kinase A (PKA), the prototypic kinase that phosphorylates CREB, is not. Instead, TrkA-activated GPCR-kinase (GRK)-2 mediates the sustained CREB activation during α2AR-induced neuronal differentiation of PC12 cells. In conclusion, catecholaminergic-induced neuronal differentiation of PC12 cells through α2ARs uses a non-canonical pathway involving TrkA transactivation and subsequent GRK2-dependent, sustained phosphorylation/activation of CREB. These findings provide novel insights into catecholaminergic neurogenesis and suggest that α2AR agonists, combined with NGF analogs or GRK2 stimulators, may exert neurogenic/neuroprotective effects.
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