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Ren SG, Li DM, Liu H. Baroreflex afferent function is a part of insights of Leptin-mediated blood pressure reduction and Leptin-resistance hypertension. Neuropeptides 2024; 105:102418. [PMID: 38442503 DOI: 10.1016/j.npep.2024.102418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2024] [Revised: 02/21/2024] [Accepted: 02/27/2024] [Indexed: 03/07/2024]
Abstract
The aim of this study is to verify the impact of Leptin in blood pressure (BP) regulation and Leptin-resistance in metabolic/neurogenic hypertension through baroreflex afferents and dysregulation. Artery BP/heart rate (HR) were measured while nodose (NG) microinjection of Leptin, membrane depolarization/inward current were obtained by whole-cell patch from NG neurons isolated from adult female rats. Baroreflex sensitivity (BRS) tested with PE/SNP, distribution/expression of Leptin/receptors in the NG/nucleus tractus solitary (NTS) examined using immumostaining and qRT-PCR, and serum concentrations of Leptin/NE measured by ELISA were observed in control and high fructose-drinking induced hypertension (HTN-HFD) rats. The results showed that BP was significantly/dose-dependently reduced by Leptin NG microinjection likely through direct excitation of female-specific subpopulation of Ah-type neurons showing a potent membrane depolarization/inward currents. Sex-specific distribution/expression of OB-Ra/OB-Rb in the NG were detected with estrogen-dependent manner, similar observations were also confirmed in the NTS. As expected, BRS was dramatically decreased in the presence of PE/SNP in both male and female rats except for the female with PE at given concentrations. Additionally, serum concentration of Leptin was elevated in HFD-HTN model rats of either sex with more obvious in females. Under hypertensive condition, the mean fluorescent density of OB-R and mRNA expression for OB-Ra/OB-Rb in the NG/NTS were significantly down-regulated. These results have demonstrated that Leptin play a role in dominant parasympathetic drive via baroreflex afferent activation to buffer Leptin-mediated sympathetic activation systemically and Leptin-resistance is an innegligible mechanism for metabolic/neurogenic hypertension through baroreflex afferent dysregulation.
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Affiliation(s)
- Shi-Gang Ren
- School of Public Health and Management, Wenzhou Medical University, Wenzhou 325025, China; South Zhejiang Institute of Radiation Medicine and Nuclear Technology Application, Wenzhou 325089, China
| | - Dong-Mei Li
- Basic Medical Department of Zhejiang University, Hangzhou 310030, China
| | - Hua Liu
- General Department, Wuxi Central Rehabilitation Hospital, The Affiliated Mental Health Center of Jiangnan University, Wuxi 214151, China.
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Bertaccini GA, Evans EL, Nourse JL, Dickinson GD, Liu G, Casanellas I, Seal S, Ly AT, Holt JR, Yan S, Hui EE, Panicker MM, Upadhyayula S, Parker I, Pathak MM. PIEZO1-HaloTag hiPSCs: Bridging Molecular, Cellular and Tissue Imaging. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.12.22.573117. [PMID: 38187535 PMCID: PMC10769387 DOI: 10.1101/2023.12.22.573117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
PIEZO1 channels play a critical role in numerous physiological processes by transducing diverse mechanical stimuli into electrical and chemical signals. Recent studies underscore the importance of endogenous PIEZO1 activity and localization in regulating mechanotransduction. To enable physiologically and clinically relevant human-based studies, we genetically engineered human induced pluripotent stem cells (hiPSCs) to express a HaloTag fused to endogenous PIEZO1. Combined with super-resolution imaging, our chemogenetic approach allows precise visualization of PIEZO1 in various cell types. Further, the PIEZO1-HaloTag hiPSC technology allows non-invasive monitoring of channel activity via Ca2+-sensitive HaloTag ligands, with temporal resolution approaching that of patch clamp electrophysiology. Using lightsheet imaging of hiPSC-derived neural organoids, we also achieve molecular scale PIEZO1 imaging in three-dimensional tissue samples. Our advances offer a novel platform for studying PIEZO1 mechanotransduction in human cells and tissues, with potential for elucidating disease mechanisms and development of targeted therapeutics.
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Affiliation(s)
- Gabriella A Bertaccini
- Department of Physiology and Biophysics, University of California, Irvine, Irvine, CA
- Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, CA
| | - Elizabeth L Evans
- Department of Physiology and Biophysics, University of California, Irvine, Irvine, CA
- Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, CA
| | - Jamison L Nourse
- Department of Physiology and Biophysics, University of California, Irvine, Irvine, CA
- Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, CA
| | - George D Dickinson
- Department of Physiology and Biophysics, University of California, Irvine, Irvine, CA
| | - Gaoxiang Liu
- Advanced Bioimaging Center, Department of Molecular and Cell Biology, University of California, Berkeley, United States
| | - Ignasi Casanellas
- Department of Physiology and Biophysics, University of California, Irvine, Irvine, CA
- Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, CA
| | - Sayan Seal
- Advanced Bioimaging Center, Department of Molecular and Cell Biology, University of California, Berkeley, United States
| | - Alan T Ly
- Department of Physiology and Biophysics, University of California, Irvine, Irvine, CA
- Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, CA
| | - Jesse R Holt
- Department of Physiology and Biophysics, University of California, Irvine, Irvine, CA
- Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, CA
- Center for Complex Biological Systems, University of California, Irvine, Irvine, CA
| | - Shijun Yan
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA
| | - Elliot E Hui
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA
| | - Mitradas M Panicker
- Department of Physiology and Biophysics, University of California, Irvine, Irvine, CA
- Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, CA
| | - Srigokul Upadhyayula
- Advanced Bioimaging Center, Department of Molecular and Cell Biology, University of California, Berkeley, United States
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, United States
- Chan Zuckerberg Biohub, San Francisco, United States
| | - Ian Parker
- Department of Physiology and Biophysics, University of California, Irvine, Irvine, CA
- Department of Neurobiology and Behavior, University of California, Irvine, Irvine, CA
| | - Medha M Pathak
- Department of Physiology and Biophysics, University of California, Irvine, Irvine, CA
- Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, CA
- Center for Complex Biological Systems, University of California, Irvine, Irvine, CA
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA
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