1
|
Chen Q, Muñoz AR, Korchagina AA, Shou Y, Vallecer J, Todd AW, Shein SA, Tumanov AV, Koroleva E. LTβR-RelB signaling in intestinal epithelial cells protects from chemotherapy-induced mucosal damage. Front Immunol 2024; 15:1388496. [PMID: 38873613 PMCID: PMC11169669 DOI: 10.3389/fimmu.2024.1388496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Accepted: 05/01/2024] [Indexed: 06/15/2024] Open
Abstract
The intricate immune mechanisms governing mucosal healing following intestinal damage induced by cytotoxic drugs remain poorly understood. The goal of this study was to investigate the role of lymphotoxin beta receptor (LTβR) signaling in chemotherapy-induced intestinal damage. LTβR deficient mice exhibited heightened body weight loss, exacerbated intestinal pathology, increased proinflammatory cytokine expression, reduced IL-22 expression, and proliferation of intestinal epithelial cells following methotrexate (MTX) treatment. Furthermore, LTβR-/-IL-22-/- mice succumbed to MTX treatment, suggesting that LTβR- and IL-22- dependent pathways jointly promote mucosal repair. Although both LTβR ligands LIGHT and LTβ were upregulated in the intestine early after MTX treatment, LIGHT-/- mice, but not LTβ-/- mice, displayed exacerbated disease. Further, we revealed the critical role of T cells in mucosal repair as T cell-deficient mice failed to upregulate intestinal LIGHT expression and exhibited increased body weight loss and intestinal pathology. Analysis of mice with conditional inactivation of LTβR revealed that LTβR signaling in intestinal epithelial cells, but not in Lgr5+ intestinal stem cells, macrophages or dendritic cells was critical for mucosal repair. Furthermore, inactivation of the non-canonical NF-kB pathway member RelB in intestinal epithelial cells promoted MTX-induced disease. Based on these results, we propose a model wherein LIGHT produced by T cells activates LTβR-RelB signaling in intestinal epithelial cells to facilitate mucosal repair following chemotherapy treatment.
Collapse
Affiliation(s)
- Qiangxing Chen
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, TX, United States
- Department of Gastroenterology, Second Xiangya Hospital, and Research Center of Digestive Disease, Central South University, Changsha, Hunan, China
| | - Amanda R. Muñoz
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, TX, United States
| | - Anna A. Korchagina
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, TX, United States
| | - Yajun Shou
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, TX, United States
- Department of Gastroenterology, Second Xiangya Hospital, and Research Center of Digestive Disease, Central South University, Changsha, Hunan, China
| | - Jensine Vallecer
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, TX, United States
| | - Austin W. Todd
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, TX, United States
| | - Sergey A. Shein
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, TX, United States
| | - Alexei V. Tumanov
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, TX, United States
| | - Ekaterina Koroleva
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, TX, United States
| |
Collapse
|
2
|
Sun L, Hu L, Chen P, Li Y, Tu J, Chen J. Long Non-Coding RNA AL928768.3 Promotes Rheumatoid Arthritis Fibroblast-Like Synoviocytes Proliferation, Invasion and Inflammation, While Inhibits Apoptosis Via Activating Lymphotoxin Beta Mediated NF-κB Signaling Pathway. Inflammation 2024; 47:543-556. [PMID: 37919527 DOI: 10.1007/s10753-023-01927-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 10/10/2023] [Accepted: 10/22/2023] [Indexed: 11/04/2023]
Abstract
Our previous study using RNA sequencing and reverse transcription quantitative polymerase chain reaction (RT-qPCR) validation identified a long non-coding RNA (lnc), lnc-AL928768.3, correlating with risk and disease activity of rheumatoid arthritis (RA), then the present study was conducted to further investigate the interaction of lnc-AL928768.3 with lymphotoxin beta (LTB) and their impact on proliferation, migration, invasion, and inflammation in RA-fibroblast-like synoviocytes (RA-FLS). Human RA-FLS was obtained and transfected with lnc-AL928768.3 overexpression, negative control overexpression, lnc-AL928768.3 short hairpin RNA (shRNA) and negative control shRNA plasmids. Then cell functions and inflammatory cytokine expressions were detected. Afterward, rescue experiments were conducted via transfecting lnc-AL928768.3 shRNA with or without LTB overexpression plasmids in RA-FLS. Lnc-AL928768.3 enhanced proliferation and invasion, inhibited apoptosis, while had little impact on migration in RA-FLS. In addition, lnc-AL928768.3 positively modulated interleukin-1β (IL-1β), IL-6 and IL-8 expressions in RA-FLS supernatant; moreover, it also positively regulated LTB mRNA expression, LTB protein expression, p-NF-κB protein expression, and p-IKB-α protein expression in RA-FLS. Furthermore, following experiment showed that lnc-AL928768.3 positively regulated LTB expression while LTB did not impact on lnc-AL928768.3 expression in RA-FLS. Furthermore, in rescue experiments, LTB overexpression curtailed the effect of lnc-AL928768.3 knock-down on regulating proliferation, invasion, apoptosis and inflammatory cytokine expressions in RA-FLS. Lnc-AL928768.3 promotes proliferation, invasion, and inflammation while inhibits apoptosis of RA-FLS via activating LTB mediated NF-κB signaling.
Collapse
Affiliation(s)
- Li Sun
- Kidney Disease Center, The First Affiliated Hospital, College of Medicine, Zhejiang University; Key Laboratory of Kidney Disease Prevention and Control Technology National Key Clinical Department of Kidney Diseases, Institute of Nephrology, Zhejiang University; Zhejiang Clinical Research Center of Kidney and Urinary System Disease, Hangzhou, Zhejiang Province, China
| | - Lingzhen Hu
- Department of Rheumatology and Immunology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Peirong Chen
- Department of Rheumatology and Immunology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Yongji Li
- Department of Rheumatology and Immunology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Jianxin Tu
- Department of Rheumatology and Immunology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Jianghua Chen
- Kidney Disease Center, The First Affiliated Hospital, College of Medicine, Zhejiang University; Key Laboratory of Kidney Disease Prevention and Control Technology National Key Clinical Department of Kidney Diseases, Institute of Nephrology, Zhejiang University; Zhejiang Clinical Research Center of Kidney and Urinary System Disease, Hangzhou, Zhejiang Province, China.
| |
Collapse
|
3
|
Haroun E, Dutta D, Lim SH. Effects of GBT1118, a voxelotor analog, on intestinal pathophysiology in sickle cell disease. Br J Haematol 2023. [PMID: 37052197 DOI: 10.1111/bjh.18813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 04/03/2023] [Accepted: 04/04/2023] [Indexed: 04/14/2023]
Abstract
Voxelotor is an allosteric haemoglobin (Hb) modulator that binds covalently and reversibly to Hb alpha chain to facilitate improved Hb-O2 affinity and arterial oxygen. It, therefore, reduces the susceptibility of erythrocytes carrying Haemoglobin S to sickle. In this study, we have used GBT1118, an analog of voxelotor, to treat male Townes sickle cell disease (SCD) mice to investigate whether the Hb modulator could attenuate the intestinal pathophysiologic changes associated with SCD. Compared with mice fed with control chow, GBT1118-treated mice showed improvement in the intestinal pathophysiology. These mice exhibited improved small intestinal barrier functions, reduced intestinal microbial density, reduced enterocyte injury, lower serum lipopolysaccharides and smaller spleens. These improvements were observed after only 3 weeks of GBT1118 treatment. Benefits were also observed after experimentally-induced vaso-occlusive crisis (VOC). Recovery from the VOC-induced changes was faster in mice that were treated with GBT1118. The improved small intestinal barrier function was associated with higher expression of genes encoding enterocyte E-cadherin, JAM-A, ZO-1, MUC-2 and occludin while the lower intestinal microbial density associated with higher expression of genes encoding the antimicrobial peptides defensin-α 1 and defensin-α 4. Our findings provide the evidence to support the beneficial effects of GBT1118 in SCD-related intestinal pathophysiology.
Collapse
Affiliation(s)
- Elio Haroun
- Division of Hematology and Oncology, Department of Medicine, State University of New York Upstate Medical University, Syracuse, New York, USA
| | - Dibyendu Dutta
- Division of Hematology and Oncology, Department of Medicine, State University of New York Upstate Medical University, Syracuse, New York, USA
| | - Seah H Lim
- Division of Hematology and Oncology, Department of Medicine, State University of New York Upstate Medical University, Syracuse, New York, USA
| |
Collapse
|
4
|
Renner TM, Agbayani G, Dudani R, McCluskie MJ, Akache B. Blood-Based Immune Protein Markers of Disease Progression in Murine Models of Acute and Chronic Inflammatory Bowel Disease. Biomedicines 2023; 11:biomedicines11010140. [PMID: 36672648 PMCID: PMC9855888 DOI: 10.3390/biomedicines11010140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 12/22/2022] [Accepted: 12/24/2022] [Indexed: 01/09/2023] Open
Abstract
Inflammatory bowel disease (IBD) is a chronic ailment afflicting millions of people worldwide, with the majority of recognized cases within industrialized countries. The impacts of IBD at the individual level are long-lasting with few effective treatments available, resulting in a large burden on the health care system. A number of existing animal models are utilized to evaluate novel treatment strategies. Two commonly used models are (1) acute colitis mediated by dextran sulphate sodium (DSS) treatment of wild-type mice and (2) chronic colitis mediated by the transfer of proinflammatory T cells into immunodeficient mice. Despite the wide use of these particular systems to evaluate IBD therapeutics, the typical readouts of clinical disease progression vary depending on the model used, which may be reflective of mechanistic differences of disease induction. The most reliable indicator of disease in both models remains intestinal damage which is typically evaluated upon experimental endpoint. Herein, we evaluated the expression profile of a panel of cytokines and chemokines in both DSS and T cell transfer models in an effort to identify a number of inflammatory markers in the blood that could serve as reliable indicators of the relative disease state. Out of the panel of 25 markers tested, 6 showed statistically significant shifts with the DSS model, compared to 11 in the T cell transfer model with IL-6, IL-13, IL-22, TNF-α and IFN-γ being common markers of disease in both models. Our data highlights biological differences between animal models of IBD and helps to guide future studies when selecting efficacy readouts during the evaluation of experimental IBD therapeutics.
Collapse
|
5
|
Harris CS, Miaskowski CA, Conley YP, Hammer MJ, Dhruva AA, Levine JD, Olshen AB, Kober KM. Gastrointestinal Symptom Cluster is Associated With Epigenetic Regulation of Lymphotoxin Beta in Oncology Patients Receiving Chemotherapy. Biol Res Nurs 2023; 25:51-64. [PMID: 35929442 PMCID: PMC9900252 DOI: 10.1177/10998004221115863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
OBJECTIVES While the gastrointestinal symptom cluster (GISC) is common in patients receiving chemotherapy, limited information is available on its underlying mechanism(s). Emerging evidence suggests a role for inflammatory processes through the actions of the nuclear factor kappa B (NF-κB) signaling pathway. This study evaluated for associations between a GISC and levels of DNA methylation for genes within this pathway. METHODS Prior to their second or third cycle of chemotherapy, 1071 outpatients reported symptom occurrence using the Memorial Symptom Assessment Scale. A GISC was identified using exploratory factor analysis. Differential methylation analyses were performed in two independent samples using EPIC (n = 925) and 450K (n = 146) microarrays. Trans expression-associated CpG (eCpG) loci for 56 NF-κB signaling pathway genes were evaluated. Loci significance were assessed using an exploratory false discovery rate (FDR) of 25% for the EPIC sample. For the validation assessment using the 450K sample, significance was assessed at an unadjusted p-value of 0.05. RESULTS For the EPIC sample, the GISC was associated with increased expression of lymphotoxin beta (LTB) at one differentially methylated trans eCpG locus (cg03171795; FDR = 0.168). This association was not validated in the 450K sample. CONCLUSIONS This study is the first to identify an association between a GISC and epigenetic regulation of a gene that is involved in the initiation of gastrointestinal immune responses. Findings suggest that increased LTB expression by hypermethylation of a trans eCpG locus is involved in the occurrence of this cluster in patients receiving chemotherapy. LTB may be a potential therapeutic target for this common cluster.
Collapse
Affiliation(s)
| | - Christine A. Miaskowski
- School of Nursing, University of
California, San Francisco, CA, USA
- School of Medicine, University of
California, San Francisco, CA, USA
| | - Yvette P. Conley
- School of Nursing, University of
Pittsburgh, Pittsburgh, PA, USA
| | - Marilyn J. Hammer
- The Phyllis F. Cantor Center for
Research in Nursing and Patient Care Services, Dana-Farber Cancer
Institute, Boston, MA, USA
| | - Anand A. Dhruva
- School of Medicine, University of
California, San Francisco, CA, USA
| | - Jon D. Levine
- School of Medicine, University of
California, San Francisco, CA, USA
| | - Adam B. Olshen
- School of Medicine, University of
California, San Francisco, CA, USA
| | - Kord M. Kober
- School of Nursing, University of
California, San Francisco, CA, USA
| |
Collapse
|
6
|
Hwang JW, Kim YC, Lee HY, Lee KJ, Kim TH, Lee SH. The tumor necrosis factor family molecules LIGHT and lymphotoxins in sinus mucosa of patients with chronic rhinosinusitis with or without nasal polyps. Cytokine 2021; 148:155594. [PMID: 34083106 DOI: 10.1016/j.cyto.2021.155594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 05/22/2021] [Accepted: 05/24/2021] [Indexed: 12/01/2022]
Abstract
BACKGROUND Little is known about the role of lymphotoxins (LTs) family in the sinonasal mucosa of patients with chronic rhinosinusitis (CRS). This study aims at investigating the expression of LIGHT, LTα, LTβ, and their receptors, LTβR and HVEM in normal and inflammatory sinus mucosa, and the effect of LIGHT and LTalpha1beta2 on chemokine secretion in epithelial cells, epithelial permeability, and leukocyte migration. MATERIAL AND METHODS The expression of LTs family in sinonasal mucosa was evaluated with real-time PCR, immunohistochemistry, and western blot. In LTβR, HVEM siRNA, or control siRNA-transfected epithelial cells treated with LIGHT or LTalpha1beta2, the expression of chemokines, the epithelial permeability, and the expression of junctional complex proteins were evaluated using real-time PCR, ELISA, western blot, confocal microscopy, and FITC-dextran. In cultured endothelial cells treated with LIGHT or LTalpha1beta2, the expression of ICAM-1 and VCAM-1, and leukocyte migration were elucidated. RESULTS LTs family was expressed in normal mucosa and their levels were increased in inflammatory mucosa of CRS patients. Recombinant LIGHT and LTalpha1beta2 induced chemokine secretion, increased epithelial permeability, and promoted leukocyte migration. However, the activity of LIGHT and LTalpha1beta2 was attenuated in cells transfected with LTβR and HVEM siRNA. CONCLUSIONS LIGHT and LTs may participate in the ongoing process of chronic inflammation, inducing chemokine secretion, leukocyte migration, and dysregulated epithelial barrier through LTβR and HVEM in sinonasal mucosa.
Collapse
Affiliation(s)
- Jae Woong Hwang
- Department of Otorhinolaryngology-Head & Neck Surgery, College of Medicine, Korea University, Seoul, South Korea
| | - Young Chan Kim
- Department of Otorhinolaryngology-Head & Neck Surgery, College of Medicine, Korea University, Seoul, South Korea
| | - Ho Young Lee
- Department of Otorhinolaryngology-Head & Neck Surgery, College of Medicine, Korea University, Seoul, South Korea
| | - Ki Jeong Lee
- Department of Otorhinolaryngology-Head & Neck Surgery, College of Medicine, Korea University, Seoul, South Korea
| | - Tae Hoon Kim
- Department of Otorhinolaryngology-Head & Neck Surgery, College of Medicine, Korea University, Seoul, South Korea
| | - Sang Hag Lee
- Department of Otorhinolaryngology-Head & Neck Surgery, College of Medicine, Korea University, Seoul, South Korea.
| |
Collapse
|
7
|
Romero-Nava R, Alarcón-Aguilar FJ, Giacoman-Martínez A, Blancas-Flores G, Aguayo-Cerón KA, Ballinas-Verdugo MA, Sánchez-Muñoz F, Huang F, Villafaña-Rauda S, Almanza-Pérez JC. Glycine is a competitive antagonist of the TNF receptor mediating the expression of inflammatory cytokines in 3T3-L1 adipocytes. Inflamm Res 2021; 70:605-618. [PMID: 33877377 DOI: 10.1007/s00011-021-01462-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 02/16/2021] [Accepted: 04/05/2021] [Indexed: 01/20/2023] Open
Abstract
OBJECTIVE To determine the involvement of TNF-α and glycine receptors in the inhibition of pro-inflammatory adipokines in 3T3-L1 cells. METHODS RT-PCR evidenced glycine receptors in 3T3-L1 adipocytes. 3T3-L1 cells were transfected with siRNA for the glycine (Glrb) and TNF1a (Tnfrsf1a) receptors and confirmed by confocal microscopy. Transfected cells were treated with glycine (10 mM). The expressions of TNF-α and IL-6 mRNA were measured by qRT-PCR, while concentrations were quantified by ELISA. RESULTS Glycine decreased the expression and concentration of TNF-α and IL-6; this effect did not occur in the absence of TNF-α receptor due to siRNA. In contrast, glycine produced only slight changes in the expression of TNF-α and IL-6 in the absence of the glycine receptor due to siRNA. A docking analysis confirmed the possibility of binding glycine to the TNF-α1a receptor. CONCLUSION These findings support the idea that glycine could partially inhibit the binding of TNF-α to its receptor and provide clues about the mechanisms by which glycine inhibits the secretion of pro-inflammatory adipokines in adipocytes through the TNF-α receptor.
Collapse
MESH Headings
- 3T3-L1 Cells
- Adipocytes/metabolism
- Adiponectin/genetics
- Animals
- Cytokines/genetics
- Cytokines/metabolism
- Gene Expression
- Glycine/pharmacology
- Mice
- NF-kappa B/antagonists & inhibitors
- NF-kappa B/metabolism
- RNA, Messenger/metabolism
- RNA, Small Interfering/genetics
- Receptors, Glycine/genetics
- Receptors, Tumor Necrosis Factor, Type I/antagonists & inhibitors
- Receptors, Tumor Necrosis Factor, Type I/genetics
- Receptors, Tumor Necrosis Factor, Type II/antagonists & inhibitors
- Receptors, Tumor Necrosis Factor, Type II/genetics
Collapse
Affiliation(s)
- Rodrigo Romero-Nava
- Laboratorio de Farmacología, Departamento de Ciencias de la Salud, DCBS, Universidad Autónoma Metropolitana-Iztapalapa (UAM-I), San Rafael Atlixco 186, Col. Vicentina. Iztapalapa, C.P. 09340, Mexico City, Mexico
- Departamento de Farmacología y Toxicología, Hospital Infantil de México Federico Gómez, Mexico City, Mexico
- Sección de Posgrado, Laboratorio de Señalización Intracelular, Escuela Superior de Medicina del Instituto Politécnico Nacional, Mexico City, Mexico
| | - Francisco J Alarcón-Aguilar
- Laboratorio de Farmacología, Departamento de Ciencias de la Salud, DCBS, Universidad Autónoma Metropolitana-Iztapalapa (UAM-I), San Rafael Atlixco 186, Col. Vicentina. Iztapalapa, C.P. 09340, Mexico City, Mexico
| | - Abraham Giacoman-Martínez
- Laboratorio de Farmacología, Departamento de Ciencias de la Salud, DCBS, Universidad Autónoma Metropolitana-Iztapalapa (UAM-I), San Rafael Atlixco 186, Col. Vicentina. Iztapalapa, C.P. 09340, Mexico City, Mexico
| | - Gerardo Blancas-Flores
- Laboratorio de Farmacología, Departamento de Ciencias de la Salud, DCBS, Universidad Autónoma Metropolitana-Iztapalapa (UAM-I), San Rafael Atlixco 186, Col. Vicentina. Iztapalapa, C.P. 09340, Mexico City, Mexico
| | - Karla A Aguayo-Cerón
- Sección de Posgrado, Laboratorio de Señalización Intracelular, Escuela Superior de Medicina del Instituto Politécnico Nacional, Mexico City, Mexico
| | - Martha A Ballinas-Verdugo
- Departamento de Inmunología, Instituto Nacional de Cardiología (Ignacio Chávez), Mexico City, Mexico
| | - Fausto Sánchez-Muñoz
- Departamento de Inmunología, Instituto Nacional de Cardiología (Ignacio Chávez), Mexico City, Mexico
| | - Fengyang Huang
- Departamento de Farmacología y Toxicología, Hospital Infantil de México Federico Gómez, Mexico City, Mexico
| | - Santiago Villafaña-Rauda
- Sección de Posgrado, Laboratorio de Señalización Intracelular, Escuela Superior de Medicina del Instituto Politécnico Nacional, Mexico City, Mexico
| | - Julio C Almanza-Pérez
- Laboratorio de Farmacología, Departamento de Ciencias de la Salud, DCBS, Universidad Autónoma Metropolitana-Iztapalapa (UAM-I), San Rafael Atlixco 186, Col. Vicentina. Iztapalapa, C.P. 09340, Mexico City, Mexico.
| |
Collapse
|
8
|
Chen S, Wei W, Chen M, Qin X, Qiu L, Zhang L, Zhang Y, Cao Q, Ying Z. TNF Signaling Impacts Glucagon-Like Peptide-1 Expression and Secretion. J Mol Endocrinol 2018; 61:153-161. [PMID: 30021757 PMCID: PMC6192833 DOI: 10.1530/jme-18-0129] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 07/11/2018] [Accepted: 07/17/2018] [Indexed: 12/24/2022]
Abstract
Numerous studies have implicated tumor necrosis factor α (TNFα) in the pathogenesis of type 2 diabetes. However, the role of its primary receptor, TNF receptor 1 (TNFR1), in homeostatic regulation of glucose metabolism is still controversial. In addition to TNFα, lymphotoxin α (LTα) binds to and activates TNFR1. Thus, TNFα and LTα together are known as TNF. To delineate the role of TNF signaling in glucose homeostasis, the present study ascertained how TNF signaling deficiency affects major regulatory components of glucose homeostasis. To this end, normal diet-fed male TNFR1 deficient mice (TNFR1-/-), TNFα/LTα/LTβ triple deficient mice (TNF/LT∆3), and their littermate controls were subjected to intraperitoneal glucose tolerance test, insulin tolerance test, and oral glucose tolerance test. The present results showed that TNFR1-/- and TNF/LT∆3 mice versus their controls had comparable body weight, tolerance to intraperitoneal glucose, and sensitivity to insulin. However, their tolerance to oral glucose was significantly increased. Additionally, glucose-induced insulin secretion assessments revealed that TNFR1 or TNF/LT deficiency significantly increased oral but not intraperitoneal glucose-induced insulin secretion. Consistently, qPCR and immunohistochemistry analyses showed that TNFR1-/- and TNF/LT∆3 mice versus their controls had significantly increased ileal expression of glucagon-like peptide-1 (GLP-1), one of the primary incretins. Their oral glucose-induced secretion of GLP-1 was also significantly increased. These data collectively suggest that physiological TNF signaling regulates glucose metabolism primarily through effects on GLP-1 expression and secretion and subsequently insulin secretion.
Collapse
Affiliation(s)
- Sufang Chen
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
- Department of Geriatric Endocrinology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China
| | - Wei Wei
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
- Department of Bile Pancreatic Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Minjie Chen
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
| | - Xiaobo Qin
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
| | - Lianglin Qiu
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
- Department of Occupational and Environmental Health, School of Public Health, Nantong University, Nantong 226019, China
| | - Li Zhang
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
| | - Yuhao Zhang
- Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
| | - Qi Cao
- Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
| | - Zhekang Ying
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
- Address for correspondence and reprint:Zhekang Ying PhD, 20 Penn St. HSFII S022, Baltimore, MD 21201, USA, or , Tel: 410-328-2063; Fax: 410-328-1048
| |
Collapse
|
9
|
Prolonged P-Wave and QT Dispersion in Children with Inflammatory Bowel Disease in Remission. BIOMED RESEARCH INTERNATIONAL 2017; 2017:6960810. [PMID: 28316985 PMCID: PMC5339525 DOI: 10.1155/2017/6960810] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Revised: 12/28/2016] [Accepted: 01/17/2017] [Indexed: 02/07/2023]
Abstract
Objectives. Ulcerative colitis (UC) and Crohn's disease (CD) are chronic inflammatory bowel diseases (IBD) with unclear underlying aetiologies. Severe cardiac arrhythmias have been emphasised in a few studies on adult IBD patients. This study aimed to investigate the alteration of the P-wave and QT interval dispersion parameters to assess the risk of atrial conduction and ventricular repolarisation abnormalities in pediatric IBD patients. Patients and Methods. Thirty-six IBD patients in remission (UC: 20, CD: 16) aged 3–18 years and 36 age- and sex-matched control patients were enrolled in the study. Twelve-lead electrocardiograms were used to determine durations of P-wave, QT, and corrected QT (QTc) interval dispersion. Transthoracic echocardiograms and 24-hour rhythm Holter recordings were obtained for both groups. Results. The P-wave dispersion, QT dispersion, and QTc interval dispersion (Pdisp, QTdisp, and QTcdisp) were significantly longer in the patient group. The mean values of Pminimum, Pmaximum, and QTcminimum were significantly different between the two groups. The echocardiography and Holter monitoring results were not significantly different between the groups. Furthermore, no differences in these parameters were detected between the CD and UC groups. Conclusion. Results suggest that paediatric IBD patients may carry potential risks for serious atrial and ventricular arrhythmias over time even during remission.
Collapse
|