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Jantarajit W, Lertsuwan K, Teerapornpuntakit J, Krishnamra N, Charoenphandhu N. CFTR-mediated anion secretion across intestinal epithelium-like Caco-2 monolayer under PTH stimulation is dependent on intermediate conductance K + channels. Am J Physiol Cell Physiol 2017; 313:C118-C129. [PMID: 28490422 DOI: 10.1152/ajpcell.00010.2017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 05/02/2017] [Accepted: 05/08/2017] [Indexed: 12/16/2022]
Abstract
Parathyroid hormone (PTH), a pleiotropic hormone that maintains mineral homeostasis, is also essential for controlling pH balance and ion transport across renal and intestinal epithelia. Optimization of luminal pH is important for absorption of trace elements, e.g., calcium and phosphorus. We have previously demonstrated that PTH rapidly stimulated electrogenic [Formula: see text] secretion in intestinal epithelial-like Caco-2 monolayers, but the underlying cellular mechanism, contributions of other ions, particularly Cl- and K+, and long-lasting responses are not completely understood. Herein, PTH and forskolin were confirmed to induce anion secretion, which peaked within 1-3 min (early phase), followed by an abrupt decay and plateau that lasted for 60 min (late phase). In both early and late phases, apical membrane capacitance was increased with a decrease in basolateral capacitance after PTH or forskolin exposure. PTH also induced a transient increase in apical conductance with a long-lasting decrease in basolateral conductance. Anion secretion in both phases was reduced under [Formula: see text]-free and/or Cl--free conditions or after exposure to carbonic anhydrase inhibitor (acetazolamide), CFTR inhibitor (CFTRinh-172), Na+/H+ exchanger (NHE)-3 inhibitor (tenapanor), or K+ channel inhibitors (BaCl2, clotrimazole, and TRAM-34; basolateral side), the latter of which suggested that PTH action was dependent on basolateral K+ recycling. Furthermore, early- and late-phase responses to PTH were diminished by inhibitors of PI3K (wortmannin and LY-294002) and PKA (PKI 14-22). In conclusion, PTH requires NHE3 and basolateral K+ channels to induce [Formula: see text] and Cl- secretion, thus explaining how PTH regulated luminal pH balance and pH-dependent absorption of trace minerals.
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Affiliation(s)
- Walailak Jantarajit
- Center of Calcium and Bone Research, Faculty of Science, Mahidol University, Bangkok, Thailand.,Department of Physiology, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Kornkamon Lertsuwan
- Department of Biochemistry, Faculty of Science, Mahidol University, Bangkok, Thailand; and
| | | | - Nateetip Krishnamra
- Center of Calcium and Bone Research, Faculty of Science, Mahidol University, Bangkok, Thailand.,Department of Physiology, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Narattaphol Charoenphandhu
- Center of Calcium and Bone Research, Faculty of Science, Mahidol University, Bangkok, Thailand; .,Department of Physiology, Faculty of Science, Mahidol University, Bangkok, Thailand.,Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom, Thailand
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Mamadou G, Charrueau C, Dairou J, Limas Nzouzi N, Eto B, Ponchel G. Increased intestinal permeation and modulation of presystemic metabolism of resveratrol formulated into self-emulsifying drug delivery systems. Int J Pharm 2017; 521:150-155. [PMID: 28216465 DOI: 10.1016/j.ijpharm.2017.02.036] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 02/13/2017] [Accepted: 02/14/2017] [Indexed: 01/25/2023]
Abstract
Despite various beneficial biological properties, resveratrol lacks therapeutic applications because of poor bioavailability due to variable absorption and extensive metabolism. The present study aims at evaluating the capability of self-emulsifying drug delivery systems (SEDDS) to enhance resveratrol permeation across rat intestine and to modulate its presystemic metabolism. For that purpose, semi-solid (SS) and liquid (L) SEDDS were prepared and dispersed in an aqueous buffer to produce nanoemulsions (NE). The jejunal absorptive transepithelial fluxes (Jms) of resveratrol elicited by these formulations (SS-NE and L-NE) and presystemic metabolization were determined on Ussing chambers. The absorptive fluxes through the intestinal epithelium from the nanoemulsions (Jms=20.5±3.1μgh-1cm-2 SS-NE; 28.9±2.9μgh-1cm-2 L-NE) were significantly increased compared to an ethanolic control solution (Jms=3.4±0.3μgh-1cm-2, p<0.05). No significant variations of conductance were observed after two hours of contact between the formulations and the mucosa. Simultaneously, the presystemic metabolization pattern was modified in the case of the nanoemulsions compared to the control solution. In conclusion, our data suggests that oil-in-water nanoemulsions prepared from SEDDS dispersions of medium-chain lipids could be promising formulations for enhancing oral delivery of resveratrol.
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Affiliation(s)
- G Mamadou
- Institut Galien Paris-Sud, CNRS UMR 8612, Université Paris-Sud, Université Paris-Saclay, Châtenay-Malabry, France; TransCell-Lab Laboratory, Faculty of Medicine Xavier Bichat, University of Paris Diderot - Paris7, Paris, France.
| | - C Charrueau
- Unité de Technologies Chimiques et Biologiques pour la Santé UTCBS UMR 8258 CNRS/U1022 INSERM, Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - J Dairou
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, UMR 8601 CNRS, Université Paris Descartes, Sorbonne Paris Cité, 45 rue des Saints-Pères, 75270 Paris Cedex 06, France
| | - N Limas Nzouzi
- TransCell-Lab Laboratory, Faculty of Medicine Xavier Bichat, University of Paris Diderot - Paris7, Paris, France
| | - B Eto
- TransCell-Lab Laboratory, Faculty of Medicine Xavier Bichat, University of Paris Diderot - Paris7, Paris, France
| | - G Ponchel
- Institut Galien Paris-Sud, CNRS UMR 8612, Université Paris-Sud, Université Paris-Saclay, Châtenay-Malabry, France
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Xie FT, Cao JS, Zhao J, Yu Y, Qi F, Dai XC. IDO expressing dendritic cells suppress allograft rejection of small bowel transplantation in mice by expansion of Foxp3+ regulatory T cells. Transpl Immunol 2015; 33:69-77. [PMID: 26002283 DOI: 10.1016/j.trim.2015.05.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 05/13/2015] [Accepted: 05/13/2015] [Indexed: 01/09/2023]
Abstract
BACKGROUND Indoleamine 2,3-dioxygenase (IDO), the enzyme that catalyzes the first and rate-limiting step of tryptophan catabolism, suppresses T-cell responses by tryptophan depletion and accumulation of kynurenine metabolites. IDO prevents allograft rejection in various transplantations. METHODS Dendritic cells (DC) highly expressing IDO (IDO(+) DC) were cultured through transduction of adenovirus vectors carrying the IDO sequence. IDO(+) DC were incubated with CD4(+) CD25(-) T cells to detect T cell proliferation. The effects of IDO(+) DC and 3-Hydroxyanthranilic acid (3-HAA) were verified in an allogeneic murine small bowel transplantation (SBT) model. Foxp3(+) Treg cells of recipient mice were detected by flow cytometry and cytokines in plasma were determined by ELISA. RESULTS IDO(+) DC effectively suppressed proliferation of CD4(+) CD25(-) T cells in vitro, and this effect could be enhanced by adding 3-HAA. In the SBT transplantation model, both 3-HAA (P < 0.05) and IDO(+) DC (P < 0.01) prolonged the survival time of transplanted mice. Mice treated with IDO(+) DC achieved longer mean survival time than 3-HAA administrated mice (11.5d vs. 18.5d). Grafts from IDO(+) DC, 3-HAA and combination treatment group showed reduced inflammation and minimal architectural distortion. IFN-γ production was significantly inhibited by IDO(+) DC and 3-HAA (P<0.05). The expression of IL-2 was slightly lower with 3-HAA or IDO(+) DC treatment. However, IL-10 was higher in 3-HAA, IDO(+) DC and combination treatment groups, while TGF-β was elevated in all non-control groups. CONCLUSIONS IDO(+) DC plus 3-HAA has an immunoprotective role and represents a potential strategy to suppress acute rejection and prolong survival of grafts in SBT.
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Affiliation(s)
- Fang Tao Xie
- Department of General Surgery, Tianjin Medical University General Hospital, Tianjin, China
| | - Ji Sen Cao
- Department of General Surgery, Tianjin Medical University General Hospital, Tianjin, China
| | - Jian Zhao
- Department of General Surgery, Tianjin Medical University General Hospital, Tianjin, China
| | - Yang Yu
- Department of General Surgery, Tianjin Medical University General Hospital, Tianjin, China
| | - Feng Qi
- Department of General Surgery, Tianjin Medical University General Hospital, Tianjin, China
| | - Xiang Chen Dai
- Department of General Surgery, Tianjin Medical University General Hospital, Tianjin, China.
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Song P, Du Y, Song W, Liu X, Hong L, Li H, Xie H, Zhou L, Tuo B, Zheng S. Bile deficiency induces changes in intestinal Cl(-) and HCO3 (-) secretions in mice. Acta Physiol (Oxf) 2014; 211:421-33. [PMID: 24731192 DOI: 10.1111/apha.12301] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Revised: 08/28/2013] [Accepted: 04/10/2014] [Indexed: 12/14/2022]
Abstract
AIMS Biliary tract obstruction is a common clinical lesion. However, the effect of biliary tract obstruction on intestinal secretion is poorly understood. In this study, we made an investigation on intestinal HCO3 (-) and Cl(-) secretions in an experimental model of murine biliary duct ligation. METHODS Murine intestinal mucosal HCO3 (-) and Cl(-) secretions were examined in vitro in Ussing chambers by pH-stat and short-circuit current (Isc ) techniques. The mRNA and protein expressions of the cystic fibrosis transmembrane conductance regulator (CFTR) and the Na(+) -K(+) -2Cl(-) cotransporter (NKCC1) were analysed by real-time PCR, western blot and immunohistochemistry. RESULTS Basal Cl(-) secretion and forskolin-stimulated duodenal and jejunal mucosal HCO3 (-) and Cl(-) secretions in mice with common biliary duct ligation were markedly elevated, compared with controls (P < 0.05 and P < 0.01). Further experiments showed that basal Cl(-) secretion and forskolin-stimulated duodenal and jejunal mucosal HCO3 (-) and Cl(-) secretions in mice with external bile drainage were also markedly elevated. CFTRinh -172 inhibited forskolin-stimulated HCO3 (-) and Cl(-) secretions. The mRNA and protein expression levels of CFTR and NKCC1 in the intestinal mucosa with both biliary duct ligation and external bile drainage were markedly higher than those in controls (P < 0.001). Bile acid administration restored the changes in function and expression of CFTR and NKCC1 in the intestinal mucosa. CONCLUSION Bile deficiency in the intestine up-regulates the expressions of intestinal mucosal CFTR and NKCC1 and enhances intestinal mucosal HCO3 (-) and Cl(-) secretion capacity, which contributes to the understanding of intestinal physiological function for patients with biliary duct obstruction.
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Affiliation(s)
- P. Song
- Key Laboratory of Combined Multi-organ Transplantation; Ministry of Public Health; First Affiliated Hospital; School of Medicine; Zhejiang University; Hangzhou 310003 China
| | - Y. Du
- Key Laboratory of Combined Multi-organ Transplantation; Ministry of Public Health; First Affiliated Hospital; School of Medicine; Zhejiang University; Hangzhou 310003 China
| | - W. Song
- Key Laboratory of Combined Multi-organ Transplantation; Ministry of Public Health; First Affiliated Hospital; School of Medicine; Zhejiang University; Hangzhou 310003 China
| | - X. Liu
- Department of Surgery; First Affiliated Hospital; School of Medicine; Zhejiang University; Hangzhou 310003 China
| | - L. Hong
- Key Laboratory of Combined Multi-organ Transplantation; Ministry of Public Health; First Affiliated Hospital; School of Medicine; Zhejiang University; Hangzhou 310003 China
| | - H. Li
- Key Laboratory of Combined Multi-organ Transplantation; Ministry of Public Health; First Affiliated Hospital; School of Medicine; Zhejiang University; Hangzhou 310003 China
| | - H. Xie
- Key Laboratory of Combined Multi-organ Transplantation; Ministry of Public Health; First Affiliated Hospital; School of Medicine; Zhejiang University; Hangzhou 310003 China
| | - L. Zhou
- Key Laboratory of Combined Multi-organ Transplantation; Ministry of Public Health; First Affiliated Hospital; School of Medicine; Zhejiang University; Hangzhou 310003 China
| | - B. Tuo
- Department of Gastroenterology; Affiliated Hospital of Zunyi Medical College; Zunyi 563003 China
| | - S. Zheng
- Key Laboratory of Combined Multi-organ Transplantation; Ministry of Public Health; First Affiliated Hospital; School of Medicine; Zhejiang University; Hangzhou 310003 China
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