1
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Yan JT, Zhu YZ, Liang L, Feng XY. NE-activated β 2-AR/β-arrestin 2/Src pathway mediates duodenal hyperpermeability induced by water-immersion restraint stress. Am J Physiol Cell Physiol 2023; 324:C133-C141. [PMID: 36440855 DOI: 10.1152/ajpcell.00412.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Stress causes a rapid spike in norepinephrine (NE) levels, leading to gastrointestinal dysfunction. NE reduces the expression of tight junctions (TJs) and aggravates intestinal mucosal damage, but the regulatory mechanism is still unclear. The present study aimed to investigate the molecular mechanisms underlying the regulation of stress-associated duodenal hyperpermeability by NE. Fluorescein isothiocyanate-dextran permeability, transepithelial resistance, immunofluorescence, Western blot, and high-performance liquid chromatography analysis were used in water-immersion restraint stress (WIRS) rats in this study. The results indicate that the duodenal permeability, degradation of TJs, mucosal NE, and β2-adrenergic receptor (β2-AR) increased in WIRS rats. The duodenal intracellular cyclic adenosine monophosphate levels were decreased, whereas the expression of β-arrestin 2 negatively regulates G protein-coupled receptors signaling, was significantly increased. Src recruitment was mediated by β-arrestin; thus, the levels of Src kinase activation were enhanced in WIRS rats. NE depletion, β2-AR, or β-arrestin 2 blockade significantly decreased mucosal permeability and increased TJs expression, suggesting improved mucosal barrier function. Moreover, NE induced an increased duodenal permeability of normal rats with activated β-arrestin 2/Src signaling, which was significantly inhibited by β2-AR blockade. The present findings demonstrate that the enhanced NE induced an increased duodenal permeability in WIRS rats through the activated β2-AR/β-arrestin 2/Src pathway. This study provides novel insight into the molecular mechanism underlying the regulation of NE on the duodenal mucosal barrier and a new target for treating duodenal ulcers induced by stress.
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Affiliation(s)
- Jing-Ting Yan
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China.,Department of Anesthesiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Institute of Anesthesia and Respiratory Critical Medicine, Jinan, China
| | - Yin-Zhe Zhu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Liang Liang
- Grade 2020 Pediatrics, School of Basic Medical Science, Capital Medical University, Beijing, China
| | - Xiao-Yan Feng
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
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2
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Wenzel TJ, Nyarko JNK, Heistad RM, Pennington PR, Phenix CP, Mousseau DD. An (Immuno) Fluorescence Protocol for Monitoring Monoamine Oxidase A/B Protein Distribution Within the Cell. Methods Mol Biol 2023; 2558:143-161. [PMID: 36169861 DOI: 10.1007/978-1-0716-2643-6_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The influence of a protein is not determined exclusively by its level of expression, but also by its localization within the cell. The literature often refers to the enzyme monoamine oxidase (MAO) as a mitochondrial enzyme, yet there is evidence that mitochondria-independent pools of MAO exist. These pools of MAO could exert distinct influences across physiological as well as pathological phenotypes. Fluorescence microscopy is a powerful tool for spatially resolving target proteins in cell and tissue preparations. This can rely on an antibody-based probe that targets the endogenous protein, e.g., immunofluorescence. In the event that antibodies might not be readily available or if one is interested in characterizing a variant of the wild-type protein, then a recombinant protein with a fluorescent fusion "tag" is preferred. We now describe a protocol for the detection of endogenous MAO using indirect immunofluorescence and a version of the protocol with minor modification for detecting (green) fluorescent protein-tagged MAOs. One observation we can highlight using these easily adaptable approaches is that MAO A and MAO B do not follow similar patterns of distribution throughout the cell, suggesting potential expression of MAO A and MAO B on distinct pools of mitochondria. Furthermore, distinct subcellular compartmentalization is suggested by the fact that a pool of MAO A, but not MAO B, is associated with certain lysosomal compartments. However, directed and quantitative studies will be required before any definitive statement can be made on these intriguing possibilities.
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Affiliation(s)
- Tyler J Wenzel
- Department of Psychiatry, University of Saskatchewan, Saskatoon, SK, Canada
| | | | - Ryan M Heistad
- Department of Psychiatry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Paul R Pennington
- Department of Psychiatry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Chris P Phenix
- Department of Chemistry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Darrell D Mousseau
- Department of Psychiatry, University of Saskatchewan, Saskatoon, SK, Canada.
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3
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Zhang XL, Zhang XH, Yu X, Zheng LF, Feng XY, Liu CZ, Quan ZS, Zhang Y, Zhu JX. Enhanced Contractive Tension and Upregulated Muscarinic Receptor 2/3 in Colorectum Contribute to Constipation in 6-Hydroxydopamine-Induced Parkinson's Disease Rats. Front Aging Neurosci 2022; 13:770841. [PMID: 35002677 PMCID: PMC8733788 DOI: 10.3389/fnagi.2021.770841] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 12/02/2021] [Indexed: 11/30/2022] Open
Abstract
Constipation and defecatory dysfunctions are frequent symptoms in patients with Parkinson’s disease (PD). The pathology of Lewy bodies in colonic and rectal cholinergic neurons suggests that cholinergic pathways are involved in colorectal dysmotility in PD. However, the underlying mechanism is unclear. The aim of the present study is to examine the effect of central dopaminergic denervation in rats, induced by injection 6-hydroxydopamine into the bilateral substania nigra (6-OHDA rats), on colorectal contractive activity, content of acetylcholine (ACh), vasoactive intestinal peptide (VIP) and expression of neural nitric oxide synthase (nNOS) and muscarinic receptor (MR). Strain gauge force transducers combined with electrical field stimulation (EFS), gut transit time, immunohistochemistry, ELISA, western blot and ultraperformance liquid chromatography tandem mass spectrometry were used in this study. The 6-OHDA rats exhibited outlet obstruction constipation characterized by prolonged transit time, enhanced contractive tension and fecal retention in colorectum. Pretreatment with tetrodotoxin significantly increased the colorectal motility. EFS-induced cholinergic contractions were diminished in the colorectum. Bethanechol chloride promoted colorectal motility in a dose-dependent manner, and much stronger reactivity of bethanechol chloride was observed in 6-OHDA rats. The ACh, VIP and protein expression of nNOS was decreased, but M2R and M3R were notably upregulated in colorectal muscularis externa. Moreover, the number of cholinergic neurons was reduced in sacral parasympathetic nucleus (SPN) of 6-OHDA rats. In conclusion, central nigrostriatal dopaminergic denervation is associated with decreased cholinergic neurons in SPN, decreased ACh, VIP content, and nNOS expression and upregulated M2R and M3R in colorectum, resulting in colorectal dysmotility, which contributes to outlet obstruction constipation. The study provides new insights into the mechanism of constipation and potential therapeutic targets for constipation in PD patients.
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Affiliation(s)
- Xiao-Li Zhang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Xiao-Hui Zhang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China.,Artificial Liver Treatment Center, Beijing Youan Hospital, Capital Medical University, Beijing, China
| | - Xiao Yu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Li-Fei Zheng
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Xiao-Yan Feng
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Chen-Zhe Liu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Zhu-Sheng Quan
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Yue Zhang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Jin-Xia Zhu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
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Li J, Hou W, Lin S, Wang L, Pan C, Wu F, Liu J. Polydopamine Nanoparticle-Mediated Dopaminergic Immunoregulation in Colitis. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2104006. [PMID: 34713621 PMCID: PMC8728836 DOI: 10.1002/advs.202104006] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2021] [Indexed: 05/03/2023]
Abstract
Despite immunosuppression is critical for reducing immune overactivation, existing immunosuppressive agents are largely restricted by low inhibition efficiencies and unpredictable off-target toxicities. Here, the use of the dopaminergic system is reported to suppress hyperactive immune responses in local inflamed tissues. A polydopamine nanoparticular immunosuppressant (PDNI) is synthesized to stimulate regulatory T (Treg) cells and directly inhibit T helper 1 (Th1), Th2, and Th17 cells. Moreover, PDNI can inhibit the activation of dendritic cells to upregulate the ratio of Treg/Th17, which assists the reversion of inflammatory responses. The application of dopaminergic immunoregulation is further disclosed by combining with gut microbiota modulation for treating inflammations. The combination is implemented by coating living beneficial bacteria with PDNI. Following oral delivery, coated bacteria not only suppress the hyperactive immune responses but also positively modulate the gut microbiome in mice characterized with colitis. Strikingly, the combination demonstrates enhanced treatment efficacies in comparison with clinical aminosalicylic acid in two murine models of colitis. The use of the dopaminergic system opens a window to intervene immune responses and provides a versatile platform for the development of new therapeutics for treating inflammatory diseases.
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Affiliation(s)
- Juanjuan Li
- State Key Laboratory of Oncogenes and Related GenesShanghai Cancer InstituteShanghai Key Laboratory for Nucleic Acid Chemistry and NanomedicineInstitute of Molecular MedicineRenji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai200127China
| | - Weiliang Hou
- State Key Laboratory of Oncogenes and Related GenesShanghai Cancer InstituteShanghai Key Laboratory for Nucleic Acid Chemistry and NanomedicineInstitute of Molecular MedicineRenji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai200127China
| | - Sisi Lin
- State Key Laboratory of Oncogenes and Related GenesShanghai Cancer InstituteShanghai Key Laboratory for Nucleic Acid Chemistry and NanomedicineInstitute of Molecular MedicineRenji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai200127China
| | - Lu Wang
- State Key Laboratory of Oncogenes and Related GenesShanghai Cancer InstituteShanghai Key Laboratory for Nucleic Acid Chemistry and NanomedicineInstitute of Molecular MedicineRenji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai200127China
| | - Chao Pan
- State Key Laboratory of Oncogenes and Related GenesShanghai Cancer InstituteShanghai Key Laboratory for Nucleic Acid Chemistry and NanomedicineInstitute of Molecular MedicineRenji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai200127China
| | - Feng Wu
- State Key Laboratory of Oncogenes and Related GenesShanghai Cancer InstituteShanghai Key Laboratory for Nucleic Acid Chemistry and NanomedicineInstitute of Molecular MedicineRenji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai200127China
| | - Jinyao Liu
- State Key Laboratory of Oncogenes and Related GenesShanghai Cancer InstituteShanghai Key Laboratory for Nucleic Acid Chemistry and NanomedicineInstitute of Molecular MedicineRenji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai200127China
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5
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Zhou L, Zheng LF, Zhang XL, Wang ZY, Yao YS, Xiu XL, Liu CZ, Zhang Y, Feng XY, Zhu JX. Activation of α7nAChR Protects Against Gastric Inflammation and Dysmotility in Parkinson's Disease Rats. Front Pharmacol 2021; 12:793374. [PMID: 34880768 PMCID: PMC8646045 DOI: 10.3389/fphar.2021.793374] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 11/03/2021] [Indexed: 12/14/2022] Open
Abstract
The cholinergic anti-inflammatory pathway (CAIP) has been proposed to regulate gastrointestinal inflammation via acetylcholine released from the vagus nerve activating α7 nicotinic receptor (α7nAChR) on macrophages. Parkinson’s disease (PD) patients and PD rats with substantia nigra (SN) lesions exhibit gastroparesis and a decayed vagal pathway. To investigate whether activating α7nAChR could ameliorate inflammation and gastric dysmotility in PD rats, ELISA, western blot analysis, and real-time PCR were used to detect gastric inflammation. In vitro and in vivo gastric motility was investigated. Proinflammatory mediator levels and macrophage numbers were increased in the gastric muscularis of PD rats. α7nAChR was located on the gastric muscular macrophages of PD rats. The α7nAChR agonists PNU-282987 and GTS-21 decreased nuclear factor κB (NF-κB) activation and monocyte chemotactic protein-1 mRNA expression in the ex vivo gastric muscularis of PD rats, and these effects were abolished by an α7nAChR antagonist. After treatment with PNU-282987 in vivo, the PD rats showed decreased NF-κB activation, inflammatory mediator production, and contractile protein expression and improved gastric motility. The present study reveals that α7nAChR is involved in the development of gastroparesis in PD rats and provides novel insight for the treatment of gastric dysmotility in PD patients.
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Affiliation(s)
- Li Zhou
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China.,Department of Human Anatomy and Histoembryology, School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang, China
| | - Li-Fei Zheng
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Xiao-Li Zhang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Zhi-Yong Wang
- Department of Human Anatomy and Histoembryology, School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang, China
| | - Yuan-Sheng Yao
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Xiao-Lin Xiu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Chen-Zhe Liu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Yue Zhang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Xiao-Yan Feng
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Jin-Xia Zhu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
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Amato A, Terzo S, Marchesa P, Maffongelli A, Martorana M, Scoglio S, Mulè F. Spasmolytic Effects of Aphanizomenon Flos Aquae (AFA) Extract on the Human Colon Contractility. Nutrients 2021; 13:nu13103445. [PMID: 34684446 PMCID: PMC8539423 DOI: 10.3390/nu13103445] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 09/21/2021] [Accepted: 09/27/2021] [Indexed: 11/16/2022] Open
Abstract
The blue-green algae Aphanizomenon flos aquae (AFA), rich in beneficial nutrients, exerts various beneficial effects, acting in different organs including the gut. Klamin® is an AFA extract particularly rich in β-PEA, a trace-amine considered a neuromodulator in the central nervous system. To date, it is not clear if β-PEA exerts a role in the enteric nervous system. The aims of the present study were to investigate the effects induced by Klamin® on the human distal colon mechanical activity, to analyze the mechanism of action, and to verify a β-PEA involvement. The organ bath technique, RT-PCR, and immunohistochemistry (IHC) were used. Klamin® reduced, in a concentration-dependent manner, the amplitude of the spontaneous contractions. EPPTB, a trace-amine receptor (TAAR1) antagonist, significantly antagonized the inhibitory effects of both Klamin® and exogenous β-PEA, suggesting a trace-amine involvement in the Klamin® effects. Accordingly, AphaMax®, an AFA extract containing lesser amount of β-PEA, failed to modify colon contractility. Moreover, the Klamin® effects were abolished by tetrodotoxin, a neural blocker, but not by L-NAME, a nitric oxide-synthase inhibitor. On the contrary methysergide, a serotonin receptor antagonist, significantly antagonized the Klamin® effects, as well as the contractility reduction induced by 5-HT. The RT-PCR analysis revealed TAAR1 gene expression in the colon and the IHC experiments showed that 5-HT-positive neurons are co-expressed with TAAR1 positive neurons. In conclusion, the results of this study suggest that Klamin® exerts spasmolytic effects in human colon contractility through β-PEA, that, by activating neural TAAR1, induce serotonin release from serotoninergic neurons of the myenteric plexus.
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Affiliation(s)
- Antonella Amato
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Viale delle Scienze, 90128 Palermo, Italy; (S.T.); (F.M.)
- Correspondence: ; Tel.: +39-091-2389-7506
| | - Simona Terzo
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Viale delle Scienze, 90128 Palermo, Italy; (S.T.); (F.M.)
| | - Pierenrico Marchesa
- U.O. Oncology Hospital, A.R.N.A.S. Ospedali Civico Di Cristina Benfratelli, Palermo, Via Carmelo Lazzaro, 4, 90127 Palermo, Italy; (P.M.); (A.M.); (M.M.)
| | - Angela Maffongelli
- U.O. Oncology Hospital, A.R.N.A.S. Ospedali Civico Di Cristina Benfratelli, Palermo, Via Carmelo Lazzaro, 4, 90127 Palermo, Italy; (P.M.); (A.M.); (M.M.)
| | - Martina Martorana
- U.O. Oncology Hospital, A.R.N.A.S. Ospedali Civico Di Cristina Benfratelli, Palermo, Via Carmelo Lazzaro, 4, 90127 Palermo, Italy; (P.M.); (A.M.); (M.M.)
| | | | - Flavia Mulè
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Viale delle Scienze, 90128 Palermo, Italy; (S.T.); (F.M.)
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7
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Nakamori H, Noda K, Mitsui R, Hashitani H. Role of enteric dopaminergic neurons in regulating peristalsis of rat proximal colon. Neurogastroenterol Motil 2021; 33:e14127. [PMID: 33939231 DOI: 10.1111/nmo.14127] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 02/11/2021] [Accepted: 03/02/2021] [Indexed: 12/14/2022]
Abstract
BACKGROUND Constipation is commonly seen in patients with Parkinson's disease associated with a loss of dopaminergic neurons in both central and enteric nervous systems. However, the roles of enteric dopaminergic neurons in developing constipation remain to be elucidated. Here, we investigated the roles of enteric dopaminergic neurons in the generation of colonic peristalsis. METHODS Cannulated segments of rat proximal colon were situated in the organ bath, abluminally perfused with physiological salt solution and luminally perfused with 0.9% saline. Drugs were applied in the abluminal solution. Changes in diameter along the length of the colonic segment were captured by a video camera and transformed into spatio-temporal maps. Fluorescence immunohistochemistry was also carried out. KEY RESULTS Blockade of nitrergic neurotransmission prevented oro-aboral propagation of peristaltic waves and caused a colonic constriction without affecting ripples, non-propagating myogenic contractions. Blockade of cholinergic neurotransmission also prevented peristaltic waves but suppressed ripples with a colonic dilatation. Tetrodotoxin (0.6 μM) abolished peristaltic waves and increased ripples with a constriction. SCH 23390 (20 μM), a D1 -like dopamine receptor antagonist, slowed the peristaltic waves and caused a constriction, while GBR 12909 (1 μM), a dopamine reuptake inhibitor, diminished the peristaltic waves with a dilatation. Bath-applied dopamine (3 μM) abolished the peristaltic waves associated with a colonic dilation in an SCH 23390 (5 μM)-sensitive manner. D1 receptor immunoreactivity was co-localized to nitrergic and cholinergic neurons. CONCLUSIONS AND INFERENCES Dopaminergic neurons appear to facilitate nitrergic neurons via D1 -like receptors to stabilize asynchronous contractile activity resulting in the generation of colonic peristalsis.
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Affiliation(s)
- Hiroyuki Nakamori
- Department of Cell Physiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Kenta Noda
- Department of Cell Physiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Retsu Mitsui
- Department of Cell Physiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Hikaru Hashitani
- Department of Cell Physiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
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8
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Li GW, Li J, Feng XY, Chen H, Chen Y, Liu JH, Zhang Y, Hong F, Zhu JX. Pancreatic acinar cells utilize tyrosine to synthesize L-dihydroxyphenylalanine. Exp Biol Med (Maywood) 2021; 246:2533-2542. [PMID: 34313482 DOI: 10.1177/15353702211032552] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
The pancreatic β cells can synthesize dopamine by taking L-dihydroxyphenylalanine, but whether pancreatic acinar cells synthesize dopamine has not been confirmed. By means of immunofluorescence, the tyrosine hydroxylase -immunoreactivity and aromatic amino acid decarboxylase (AADC)- immunoreactivity were respectively observed in pancreatic acinar cells and islet β cells. Treatment with L-dihydroxyphenylalanine, not tyrosine, caused the production of dopamine in the incubation of INS-1 cells (rat islet β cell line) and primary isolated islets, which was blocked by AADC inhibitor NSD-1015. However, only L-dihydroxyphenylalanine, but not dopamine, was detected when AR42J cells (rat pancreatic acinar cell line) were treated with tyrosine, which was blocked by tyrosine hydroxylase inhibitor AMPT. Dopamine was detected in the coculture of INS-1 cells with AR42J cells after treatment with tyrosine. In an in vivo study, pancreatic juice contained high levels of L-dihydroxyphenylalanine and dopamine. Both L-dihydroxyphenylalanine and dopamine accompanied with pancreatic enzymes and insulin in the pancreatic juice were all significantly increased after intraperitoneal injection of bethanechol chloride and their increases were all blocked by atropine. Inhibiting TH with AMPT blocked bethanechol chloride-induced increases in L-dihydroxyphenylalanine and dopamine, while inhibiting AADC with NSD-1015 only blocked the dopamine increase. Bilateral subdiaphragmatic vagotomy of rats leads to significant decreases of L-dihydroxyphenylalanine and dopamine in pancreatic juice. These results suggested that pancreatic acinar cells could utilize tyrosine to synthesize L-dihydroxyphenylalanine, not dopamine. Islet β cells only used L-dihydroxyphenylalanine, not tyrosine, to synthesize dopamine. Both L-dihydroxyphenylalanine and dopamine were respectively released into the pancreatic duct, which was regulated by the vagal cholinergic pathway. The present study provides important evidences for the source of L-dihydroxyphenylalanine and dopamine in the pancreas.
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Affiliation(s)
- Guang-Wen Li
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Capital Medical University, Beijing 100069, China
| | - Ji Li
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Capital Medical University, Beijing 100069, China
| | - Xiao-Yan Feng
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Capital Medical University, Beijing 100069, China
| | - Hui Chen
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Capital Medical University, Beijing 100069, China
| | - Ye Chen
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Capital Medical University, Beijing 100069, China
| | - Jing-Hua Liu
- Grade 2017 Clinical Medicine, the Sixth Clinical School of Capital Medical University, Beijing 100029, China
| | - Yue Zhang
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Capital Medical University, Beijing 100069, China
| | - Feng Hong
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Capital Medical University, Beijing 100069, China.,Department of Physiology, School of Preclinical Medicine, Wannan Medical College, Wuhu 241002, China *These authors contributed equally to this work
| | - Jin-Xia Zhu
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Capital Medical University, Beijing 100069, China
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9
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Jastrzębski M, Przybyłkowski A. Biogenic amines in the colon. POSTEP HIG MED DOSW 2021. [DOI: 10.5604/01.3001.0014.7954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The gastrointestinal (GI) tract contains the highest concentration of biogenic amines in the
human body. Neurons located in the GI tract, modulated by biogenic amines and various peptide
and non-peptide transmitters, are called Enteric Nervous System (ENS). That explains why
many medications used in neurology and psychiatry present side effects from the gut. Serotonin
(5-hyroxytrypatamine, 5-HT), 95% of which is synthesized in the gut, is the most important amine
(beside epinephrine and norepinephrine) colon functionality but another substances such as
histamine, dopamine and melatonin are also potent in modulating intestine’s actions. Over 30
receptors for 5-HT were described in the human body, and 5-HT3, 5-HT4 and 5-HT7 are known
to have the highest influence on motility and are a potent target for the drugs for treatment
GI disorders, such as Irritable Bowel Syndrome (IBS) and Inflammatory Bowel Diseases (IBD).
Histamine is a key biogenic amine for pathogenesis of allergy also in the colon. Alteration in
histaminergic system is found in patients with diarrhea and allergic enteropathy. Dopamine
affects functions of the large intestine but its modulating actions are more presented in the
upper part of GI tract. Melatonin is best known for regulating circadian circle, but may also be
a potent anti-inflammatory agent within the gut. Despite many years of research, it seems that
more studies are needed to fully understand human colon neurochemistry.
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Affiliation(s)
- Miłosz Jastrzębski
- Department of Gastroenterology and Internal Medicine, Medical University of Warsaw, Poland
| | - Adam Przybyłkowski
- Department of Gastroenterology and Internal Medicine, Medical University of Warsaw, Poland
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10
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Kumar S, Tyagi YK, Kumar M, Kumar S. Synthesis of novel 4-methylthiocoumarin and comparison with conventional coumarin derivative as a multi-target-directed ligand in Alzheimer's disease. 3 Biotech 2020; 10:509. [PMID: 33184595 PMCID: PMC7644673 DOI: 10.1007/s13205-020-02481-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 10/12/2020] [Indexed: 12/18/2022] Open
Abstract
Alzheimer's disease (AD) is a multifactorial disorder characterized by cognitive deficit and memory loss. The pathological feature of the disease involves β-amyloid senile plaques, reduced levels of acetylcholine neurotransmitter, oxidative stress and neurofibrillary tangles formation within the brain of AD patients. The present study aims to screen the inhibitory activity of newly synthesized and existing novel 4-methylthiocoumarin derivative against acetylcholinesterase, butyrylcholinesterase, BACE1, β-amyloid aggregation and oxidative stress involved in the AD pathogenesis. The in vitro assays used in this study were Ellman's assay, FRET assays, Thioflavin T, transmission electron microscopy, circular dichroism, FRAP, and TEAC. Molecular docking and dynamics studies were performed to correlate the results. C3 and C7 (thiocoumarin derivatives) were found to be the most potent inhibitors of acetylcholinesterase (IC50-5.63 µM) and butyrylcholinesterase (IC50-3.40 µM) using Ellman's assays. Enzyme kinetic studies showed that C3 and C7 compounds followed by the mixed mode of inhibition using LB plot. C3 also moderately inhibited the BACE1 using FRET assay. C3 inhibited the fibrillization of β-amyloid peptides in a concentration-dependent manner as observed by Thioflavin T, TEM studies and Circular dichroism data. Molecular modeling studies were performed to understand the probable mode of binding of C3 and C7 in the binding pocket of acetylcholinesterase, butyrylcholinesterase, BACE1 and amyloid β peptides. This indicates the important role of hydrophobic interactions between C3 and acetylcholinesterase. C3 also exhibited significant antioxidant potential by FRAP and TEAC assays. Hence, C3 might serve as a promising lead for developing novel multi target-directed ligand for the treatment of AD.
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Affiliation(s)
- Shivani Kumar
- University School of Biotechnology, Guru Gobind Singh Indraprastha University, Dwarka, Sector 16C, New Delhi, 110078 India
| | - Yogesh Kumar Tyagi
- University School of Basic and Applied Sciences, Guru Gobind Singh Indraprastha University, Dwarka, Sector 16C, New Delhi, 110078 India
| | - Manoj Kumar
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, 110029 India
| | - Suresh Kumar
- University School of Biotechnology, Guru Gobind Singh Indraprastha University, Dwarka, Sector 16C, New Delhi, 110078 India
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de Maistre S, Gaillard S, Martin JC, Richard S, Boussuges A, Rives S, Desruelle AV, Blatteau JE, Tardivel C, Risso JJ, Vallée N. Cecal metabolome fingerprint in a rat model of decompression sickness with neurological disorders. Sci Rep 2020; 10:15996. [PMID: 32994526 PMCID: PMC7524739 DOI: 10.1038/s41598-020-73033-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 09/11/2020] [Indexed: 01/19/2023] Open
Abstract
Massive bubble formation after diving can lead to decompression sickness (DCS), which can result in neurological disorders. We demonstrated that hydrogen production from intestinal fermentation could exacerbate DCS in rats fed with a standard diet. The aim of this study is to identify a fecal metabolomic signature that may result from the effects of a provocative hyperbaric exposure. The fecal metabolome was studied in two groups of rats previously fed with maize or soy in order to account for diet effects. 64 animals, weighing 379.0_20.2 g on the day of the dive, were exposed to the hyperbaric protocol. The rats were separated into two groups: 32 fed with maize (Div MAIZE) and 32 fed with soy (Div SOY). Gut fermentation before the dive was estimated by measuring exhaled hydrogen. Following hyperbaric exposure, we assessed for signs of DCS. Blood was analyzed to assay inflammatory cytokines. Conventional and ChemRICH approaches helped the metabolomic interpretation of the cecal content. The effect of the diet is very marked at the metabolomic level, a little less in the blood tests, without this appearing strictly in the clinic status. Nevertheless, 37 of the 184 metabolites analyzed are linked to clinical status. 35 over-expressed compounds let suggest less intestinal absorption, possibly accompanied by an alteration of the gut microbial community, in DCS. The decrease in another metabolite suggests hepatic impairment. This spectral difference of the ceca metabolomes deserves to be studied in order to check if it corresponds to functional microbial particularities.
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Affiliation(s)
- Sébastien de Maistre
- Service de médecine Hyperbare Expertise plongée, Hôpital d'Instruction des Armées Sainte-Anne, BP 600, 83800, Toulon Cedex 9, France
| | | | - Jean-Charles Martin
- UMR INRA 12060/INSERM1263/AMU C2VN, Plateforme Métabolomique, Faculté de Médecine la Timone, 13385, Marseille Cedex, France
| | | | - Alain Boussuges
- Institut de Recherche Biomédicale des Armées-Equipe de Recherche Subaquatique Opérationnelle, 83800, Toulon Cedex 9, France
| | - Sarah Rives
- Institut de Recherche Biomédicale des Armées-Equipe de Recherche Subaquatique Opérationnelle, 83800, Toulon Cedex 9, France
| | - Anne-Virginie Desruelle
- Institut de Recherche Biomédicale des Armées-Equipe de Recherche Subaquatique Opérationnelle, 83800, Toulon Cedex 9, France
| | - Jean-Eric Blatteau
- Service de médecine Hyperbare Expertise plongée, Hôpital d'Instruction des Armées Sainte-Anne, BP 600, 83800, Toulon Cedex 9, France
| | - Catherine Tardivel
- UMR INRA 12060/INSERM1263/AMU C2VN, Plateforme Métabolomique, Faculté de Médecine la Timone, 13385, Marseille Cedex, France
| | - Jean-Jacques Risso
- Institut de Recherche Biomédicale des Armées-Equipe de Recherche Subaquatique Opérationnelle, 83800, Toulon Cedex 9, France
| | - Nicolas Vallée
- Institut de Recherche Biomédicale des Armées-Equipe de Recherche Subaquatique Opérationnelle, 83800, Toulon Cedex 9, France.
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12
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Gastric smooth muscle cells manifest an abnormal phenotype in Parkinson's disease rats with gastric dysmotility. Cell Tissue Res 2020; 381:217-227. [PMID: 32424507 DOI: 10.1007/s00441-020-03214-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Accepted: 04/01/2020] [Indexed: 12/13/2022]
Abstract
Gastroparesis is a common symptom in Parkinson's disease (PD) and whether any change occurs in gastric smooth muscle cells (SMCs) of PD patients is unclear. We previously reported that rats with bilateral substantia nigra lesions induced by 6-hydroxydopamine (6-OHDA), referred to as 6-OHDA rats, manifest typical gastroparesis. In the present study, we further investigate the underlying mechanism. By means of an organ bath system and an implantable radiotelemetry system, both a weakened contractile force of gastric circular smooth muscle and gastric myoelectric activity were detected in the 6-OHDA rats and phasic and tonic contractions elicited by carbachol or high concentration of potassium were significantly reduced in gastric circular muscle strips. A thickened smooth muscle layer was observed under a light microscope and an ultrastructure of hypertrophic SMCs, with increased caveolae and decreased dense bodies, was observed under transmission electron microscope. Furthermore, the mRNA and protein expression levels of contractile markers (myosin light chain 20, myosin heavy chain 11 and α-smooth muscle actin) and the transcription factor serum response factor (SRF) were significantly decreased, while the TNFα and IL-1β content was increased in the 6-OHDA rats. These results suggest that the decreased contractile force in 6-OHDA rats may be associated with the phenotypic abnormality observed in SMCs, which is due to downregulated contractile proteins induced by decreased SRF expression in the inflammatory muscular microenvironment.
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Ranjbar S, Seyednejad SA, Nikfar S, Rahimi R, Abdollahi M. How can we develop better antispasmodics for irritable bowel syndrome? Expert Opin Drug Discov 2019; 14:549-562. [DOI: 10.1080/17460441.2019.1593369] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Sheyda Ranjbar
- Evidence-based Evaluation of Cost-Effectiveness and Clinical Outcomes, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, Tehran, Iran
| | - Seyed Afshin Seyednejad
- Evidence-based Evaluation of Cost-Effectiveness and Clinical Outcomes, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, Tehran, Iran
| | - Shekoufeh Nikfar
- Evidence-based Evaluation of Cost-Effectiveness and Clinical Outcomes, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, Tehran, Iran
- Department of Pharmacoeconomics and Pharmaceutical Administration, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Roja Rahimi
- Evidence-based Evaluation of Cost-Effectiveness and Clinical Outcomes, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, Tehran, Iran
- Department of Traditional Pharmacy, School of Persian Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Abdollahi
- Department of Toxicology and Pharmacology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
- Toxicology and Diseases Group, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, Tehran, Iran
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