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Rodrat M, Wongdee K, Teerapornpuntakit J, Thongbunchoo J, Tanramluk D, Aeimlapa R, Thammayon N, Thonapan N, Wattano P, Charoenphandhu N. Vasoactive intestinal peptide and cystic fibrosis transmembrane conductance regulator contribute to the transepithelial calcium transport across intestinal epithelium-like Caco-2 monolayer. PLoS One 2022; 17:e0277096. [PMID: 36399482 PMCID: PMC9674163 DOI: 10.1371/journal.pone.0277096] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Accepted: 10/20/2022] [Indexed: 11/19/2022] Open
Abstract
Vasoactive intestinal peptide (VIP) as a neurocrine factor released by enteric neurons has been postulated to participate in the regulation of transcellular active calcium transport across intestinal epithelium, but the preceding evidence is scant and inconclusive. Herein, transepithelial calcium flux and epithelial electrical parameters were determined by Ussing chamber technique with radioactive tracer in the intestinal epithelium-like Caco-2 monolayer grown on Snapwell. After 3-day culture, Caco-2 cells expressed mRNA of calcium transporters, i.e., TRPV6, calbindin-D9k, PMCA1b and NCX1, and exhibited transepithelial resistance of ~200 Ω cm2, a characteristic of leaky epithelium similar to the small intestine. VIP receptor agonist was able to enhance transcellular calcium flux, whereas VIP receptor antagonist totally abolished calcium fluxes induced by 1,25-dihydroxyvitamin D3 [1,25(OH)2D3]. Since the intestinal cystic fibrosis transmembrane conductance regulator (CFTR) could be activated by VIP and calciotropic hormones, particularly parathyroid hormone, we sought to determine whether CFTR also contributed to the 1,25(OH)2D3-induced calcium transport. A selective CFTR inhibitor (20–200 μM CFTRinh-172) appeared to diminish calcium fluxes as well as transepithelial potential difference and short-circuit current, both of which indicated a decrease in electrogenic ion transport. On the other hand, 50 μM genistein—a molecule that could rapidly activate CFTR—was found to increase calcium transport. Our in silico molecular docking analysis confirmed direct binding of CFTRinh-172 and genistein to CFTR channels. In conclusion, VIP and CFTR apparently contributed to the intestinal calcium transport, especially in the presence of 1,25(OH)2D3, thereby supporting the existence of the neurocrine control of intestinal calcium absorption.
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Affiliation(s)
- Mayuree Rodrat
- Faculty of Science, Center of Calcium and Bone Research (COCAB), Mahidol University, Bangkok, Thailand
- Faculty of Science, Department of Physiology, Mahidol University, Bangkok, Thailand
- Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom, Thailand
- Center of Research and Development for Biomedical Instrumentation, Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom, Thailand
| | - Kannikar Wongdee
- Faculty of Science, Center of Calcium and Bone Research (COCAB), Mahidol University, Bangkok, Thailand
- Faculty of Allied Health Sciences, Burapha University, Chonburi, Thailand
| | - Jarinthorn Teerapornpuntakit
- Faculty of Science, Center of Calcium and Bone Research (COCAB), Mahidol University, Bangkok, Thailand
- Department of Physiology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand
| | - Jirawan Thongbunchoo
- Faculty of Science, Center of Calcium and Bone Research (COCAB), Mahidol University, Bangkok, Thailand
- Faculty of Science, Department of Physiology, Mahidol University, Bangkok, Thailand
| | - Duangrudee Tanramluk
- Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom, Thailand
- Integrative Computational BioScience (ICBS) Center, Mahidol University, Nakhon Pathom, Thailand
| | - Ratchaneevan Aeimlapa
- Faculty of Science, Center of Calcium and Bone Research (COCAB), Mahidol University, Bangkok, Thailand
- Faculty of Science, Department of Physiology, Mahidol University, Bangkok, Thailand
| | - Nithipak Thammayon
- Faculty of Science, Center of Calcium and Bone Research (COCAB), Mahidol University, Bangkok, Thailand
- Faculty of Science, Graduate Program in Molecular Medicine, Mahidol University, Bangkok, Thailand
| | - Natchayaporn Thonapan
- Faculty of Science, Center of Calcium and Bone Research (COCAB), Mahidol University, Bangkok, Thailand
- Faculty of Science, Graduate Program in Molecular Medicine, Mahidol University, Bangkok, Thailand
| | - Pathnaree Wattano
- Faculty of Science, Center of Calcium and Bone Research (COCAB), Mahidol University, Bangkok, Thailand
| | - Narattaphol Charoenphandhu
- Faculty of Science, Center of Calcium and Bone Research (COCAB), Mahidol University, Bangkok, Thailand
- Faculty of Science, Department of Physiology, Mahidol University, Bangkok, Thailand
- Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom, Thailand
- The Academy of Science, The Royal Society of Thailand, Bangkok, Thailand
- * E-mail:
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