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Zhu B, Zhang Z, Wang X, Zhang W, Shi H, Song Z, Ding S, Yang X. Abnormal histidine metabolism promotes macrophage lipid accumulation under Ox-LDL condition. Biochem Biophys Res Commun 2022; 588:161-167. [PMID: 34954523 DOI: 10.1016/j.bbrc.2021.12.069] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 12/17/2021] [Accepted: 12/18/2021] [Indexed: 11/02/2022]
Abstract
Distinct macrophage populations exert highly heterogeneity and perform various functions, among which, a crucial function of lipid metabolism is highlighted. However, the role of histidine metabolism disorder in macrophage lipid metabolism remains elusive. Addressed this question, we sorted and cultured the bone marrow-derived macrophages (BMDMs) of histidine decarboxylase (Hdc) knockout (Hdc-/-) mice with an in vitro oxidized low-density lipoprotein (ox-LDL) model, and detected the intracellular lipids by Oil Red O staining as well as lipid probe staining. Astemizole, a canonical and long-acting histamine H1 receptor (H1R) antagonist, was applied to elucidate the impact of antagonizing the H1R-dependent signaling pathway on macrophage lipid metabolism. Subsequently, the differential expressed genes were screened and analyzed in the bone marrow-derived CD11b+ immature myeloid cells of Hdc-/- and Hdc+/+ mice with a high fat diet by the microarray study. The expression levels of cholesterol metabolism-related genes were examined by qRT-PCR to explore underlying mechanisms. Lastly, we used a high-sensitivity histidine probe to detect the intracellular histidine in the BMDMs after oxidative stress. The results revealed that histidine metabolism disorder and histamine deficiency aggravated lipid accumulation in the ox-LDL-treated BMDMs. The expression level of H1R gene in the BMDMs was down-regulated after ox-LDL stimulation. The disruption of the H1R-dependent signaling pathway by astemizole further exacerbated ox-LDL-induced lipid deposition in the BMDMs partly by up-regulating scavenger receptor class A (SR-A) for lipid intake, down-regulating neutral cholesteryl ester hydrolase (nCEH) for cholesterol esterification and down-regulating ATP-binding cassette transporters A1 (ABCA1) and ABCG1 for reverse cholesterol transport. The intracellular histidine increased under ox-LDL condition, which was further increased by Hdc knockout. Collectively, these results partially reveal the relationship between histidine metabolism and lipid metabolism in the BMDMs and offer a novel strategy for lipid metabolism disorder-associated diseases.
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Affiliation(s)
- Baoling Zhu
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, China; Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Zhiwei Zhang
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, China; Reproductive Medicine Center, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Xiangfei Wang
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, China; Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Weiwei Zhang
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, China
| | - Hongyu Shi
- Department of Cardiology, Wusong Hospital of Zhongshan Hospital, Fudan University, Shanghai, 200940, China
| | - Zhifeng Song
- Department of Oral Mucosa and Periodontitis, Shanghai Stomatological Hospital, Fudan University, Shanghai, 200433, China
| | - Suling Ding
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, China.
| | - Xiangdong Yang
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, China; Department of Cardiology, Zhongshan Hospital, Fudan University, Shanghai, 200032, China; Department of Cardiology, Wusong Hospital of Zhongshan Hospital, Fudan University, Shanghai, 200940, China.
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Yu X, Ma Y, Harding EC, Yustos R, Vyssotski AL, Franks NP, Wisden W. Genetic lesioning of histamine neurons increases sleep-wake fragmentation and reveals their contribution to modafinil-induced wakefulness. Sleep 2019; 42:zsz031. [PMID: 30722053 PMCID: PMC6519916 DOI: 10.1093/sleep/zsz031] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 01/22/2019] [Accepted: 01/29/2019] [Indexed: 11/12/2022] Open
Abstract
Acute chemogenetic inhibition of histamine (HA) neurons in adult mice induced nonrapid eye movement (NREM) sleep with an increased delta power. By contrast, selective genetic lesioning of HA neurons with caspase in adult mice exhibited a normal sleep-wake cycle overall, except at the diurnal start of the lights-off period, when they remained sleepier. The amount of time spent in NREM sleep and in the wake state in mice with lesioned HA neurons was unchanged over 24 hr, but the sleep-wake cycle was more fragmented. Both the delayed increase in wakefulness at the start of the night and the sleep-wake fragmentation are similar phenotypes to histidine decarboxylase knockout mice, which cannot synthesize HA. Chronic loss of HA neurons did not affect sleep homeostasis after sleep deprivation. However, the chronic loss of HA neurons or chemogenetic inhibition of HA neurons did notably reduce the ability of the wake-promoting compound modafinil to sustain wakefulness. Thus, part of modafinil's wake-promoting actions arise through the HA system.
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Affiliation(s)
- Xiao Yu
- Department of Life Sciences, Imperial College London, UK
| | - Ying Ma
- Department of Life Sciences, Imperial College London, UK
| | | | - Raquel Yustos
- Department of Life Sciences, Imperial College London, UK
| | - Alexei L Vyssotski
- Institute of Neuroinformatics, University of Zürich/ETH Zürich, Zürich, Switzerland
| | - Nicholas P Franks
- Department of Life Sciences, Imperial College London, UK
- UK Dementia Research Institute at Imperial College London, UK
| | - William Wisden
- Department of Life Sciences, Imperial College London, UK
- UK Dementia Research Institute at Imperial College London, UK
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Yanovsky Y, Schubring SR, Yao Q, Zhao Y, Li S, May A, Haas HL, Lin JS, Sergeeva OA. Waking action of ursodeoxycholic acid (UDCA) involves histamine and GABAA receptor block. PLoS One 2012; 7:e42512. [PMID: 22880010 PMCID: PMC3412845 DOI: 10.1371/journal.pone.0042512] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2011] [Accepted: 07/09/2012] [Indexed: 01/10/2023] Open
Abstract
Since ancient times ursodeoxycholic acid (UDCA), a constituent of bile, is used against gallstone formation and cholestasis. A neuroprotective action of UDCA was demonstrated recently in models of Alzheimer's disease and retinal degeneration. The mechanisms of UDCA action in the nervous system are poorly understood. We show now that UDCA promotes wakefulness during the active period of the day, lacking this activity in histamine-deficient mice. In cultured hypothalamic neurons UDCA did not affect firing rate but synchronized the firing, an effect abolished by the GABAAR antagonist gabazine. In histaminergic neurons recorded in slices UDCA reduced amplitude and duration of spontaneous and evoked IPSCs. In acutely isolated histaminergic neurons UDCA inhibited GABA-evoked currents and sIPSCs starting at 10 µM (IC50 = 70 µM) and did not affect NMDA- and AMPA-receptor mediated currents at 100 µM. Recombinant GABAA receptors composed of α1, β1–3 and γ2L subunits expressed in HEK293 cells displayed a sensitivity to UDCA similar to that of native GABAA receptors. The mutation α1V256S, known to reduce the inhibitory action of pregnenolone sulphate, reduced the potency of UDCA. The mutation α1Q241L, which abolishes GABAAR potentiation by several neurosteroids, had no effect on GABAAR inhibition by UDCA. In conclusion, UDCA enhances alertness through disinhibition, at least partially of the histaminergic system via GABAA receptors.
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Affiliation(s)
- Yevgenij Yanovsky
- Department of Neurophysiology, Medical Faculty, Heinrich-Heine-University, Dusseldorf, Germany
| | - Stephan R. Schubring
- Department of Neurophysiology, Medical Faculty, Heinrich-Heine-University, Dusseldorf, Germany
| | - Quiaoling Yao
- Integrative Physiology of Brain Arousal Systems, Lyon Neuroscience Research Center, INSERM U1028-CNRS UMR 5292, Faculty of Medicine, Claude Bernard University, Lyon, France
| | - Yan Zhao
- Integrative Physiology of Brain Arousal Systems, Lyon Neuroscience Research Center, INSERM U1028-CNRS UMR 5292, Faculty of Medicine, Claude Bernard University, Lyon, France
| | - Sha Li
- Department of Neurophysiology, Medical Faculty, Heinrich-Heine-University, Dusseldorf, Germany
- Integrative Physiology of Brain Arousal Systems, Lyon Neuroscience Research Center, INSERM U1028-CNRS UMR 5292, Faculty of Medicine, Claude Bernard University, Lyon, France
| | - Andrea May
- Department of Neurophysiology, Medical Faculty, Heinrich-Heine-University, Dusseldorf, Germany
| | - Helmut L. Haas
- Department of Neurophysiology, Medical Faculty, Heinrich-Heine-University, Dusseldorf, Germany
| | - Jian-Sheng Lin
- Integrative Physiology of Brain Arousal Systems, Lyon Neuroscience Research Center, INSERM U1028-CNRS UMR 5292, Faculty of Medicine, Claude Bernard University, Lyon, France
| | - Olga A. Sergeeva
- Department of Neurophysiology, Medical Faculty, Heinrich-Heine-University, Dusseldorf, Germany
- * E-mail:
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Collins S. Treating Tourette's. A gene mutation that causes low histamine levels may be behind some tic disorders. Sci Am 2011; 304:22. [PMID: 21608395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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Hegyesi H, Colombo L, Pállinger E, Tóth S, Boer K, Molnár V, Falus A. Impact of systemic histamine deficiency on the crosstalk between mammary adenocarcinoma and T cells. J Pharmacol Sci 2007; 105:66-73. [PMID: 17895589 DOI: 10.1254/jphs.fp0070636] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Abstract
The purpose of the present study was to investigate the influence of lack of histamine (HA) on tumor growth and functions of T cells in order further to illustrate the mechanism of immunological tolerance induction by HA. We assessed the phenotype and cytokine production of splenic lymphocytes in syngeneic HA-free (histidine decarboxylase knock-out) (HDC KO) and wild-type mice, inoculated subcutaneously with the LM2 murine breast cancer cell line. Relative quantification of target mRNA was performed with a TaqMan real-time RT-PCR assay. The CD4(+)CD25(high+) Treg cell numbers were significantly smaller in the tumor-bearing KO mice than in the wild type ones measured by flow-cytometry. The expression of forkhead box P3 (Foxp3) decreased significantly and the copies of splenic Tbox-21 (T-bet) transcriptional factor mRNA was higher in HDC KO tumor-bearing mice than those of normal mice. The cytokine levels showed that a smaller number of interleukin-13-producing Th2 cells were elicited compared to interferon-gamma-producing Th1 cells in the tumor-bearing HDC KO mice. In conclusion, the present study demonstrates that endogenous histamine stimulates the growth of breast adenocarcinoma tumor implants in mice by suppressing anti-tumor immunity.
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MESH Headings
- Adenocarcinoma/metabolism
- Adenocarcinoma/pathology
- Adenocarcinoma/physiopathology
- Animals
- CD3 Complex/immunology
- Cell Communication/physiology
- Cell Differentiation/immunology
- Cell Line, Tumor
- Cytokines/genetics
- Cytokines/metabolism
- Enzyme-Linked Immunosorbent Assay
- Flow Cytometry
- Forkhead Transcription Factors/genetics
- Forkhead Transcription Factors/metabolism
- Histamine/deficiency
- Histidine Decarboxylase/genetics
- Histidine Decarboxylase/metabolism
- Immunophenotyping
- Interleukin-2 Receptor alpha Subunit/immunology
- Mammary Neoplasms, Experimental/metabolism
- Mammary Neoplasms, Experimental/pathology
- Mammary Neoplasms, Experimental/physiopathology
- Mice
- Mice, Inbred BALB C
- Mice, Knockout
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Reverse Transcriptase Polymerase Chain Reaction
- Spleen/cytology
- Spleen/immunology
- T-Box Domain Proteins/genetics
- T-Box Domain Proteins/metabolism
- T-Lymphocyte Subsets/immunology
- T-Lymphocyte Subsets/metabolism
- T-Lymphocyte Subsets/physiology
- T-Lymphocytes, Regulatory/immunology
- T-Lymphocytes, Regulatory/metabolism
- T-Lymphocytes, Regulatory/physiology
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Affiliation(s)
- Hargita Hegyesi
- Department of Genetics, Cell and Immunobiology, SE Nagyvarad ter 4, Budapest, 1089 Hungary.
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Mondillo C, Falus A, Pignataro O, Pap E. Prolonged histamine deficiency in histidine decarboxylase gene knockout mice affects Leydig cell function. ACTA ACUST UNITED AC 2006; 28:86-91. [PMID: 16928894 DOI: 10.2164/jandrol.106.000257] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The present study focuses on histaminergic regulation of Leydig cell physiology, since limited information is available so far. To evaluate the dependency of Leydig cells on histamine (HA), we performed experiments using highly purified Leydig cells in culture, isolated from wild type (WT) and histidine decarboxylase (Hdc) gene knockout (HDC KO)-so HA-deprived-mice. HDC KO Leydig cells showed lower basal and human choriogonadotropin (hCG)-induced testosterone production compared to WT Leydig cells, presumably due to altered P450scc gene (Cyp11a1) expression levels. Moreover, in HDC KO cells, hCG did not increase basal expression levels of HA H1 and H2 receptor genes, while the hormone showed a significant inducing effect in WT cells. Based on these findings, we propose that prolonged HA deficiency in HDC KO mice affects various aspects of Leydig cell physiology, most importantly the response to hCG, providing definite evidence that HA plays a role as direct modulator of Leydig cell function and steroid synthesis in the testis. Also, the results presented herein constitute the first molecular evidence for the expression of HA H1 and H2 receptor subtypes in isolated Leydig cells.
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Affiliation(s)
- Carolina Mondillo
- Laboratory of Molecular Endocrinology and Signal Transduction, Institute of Biology and Experimental Medicine (IByME-CONICET), Vuelta de Obligado 2490, CP 1428, Buenos Aires, Argentina.
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Jørgensen EA, Vogelsang TW, Knigge U, Watanabe T, Warberg J, Kjaer A. Increased susceptibility to diet-induced obesity in histamine-deficient mice. Neuroendocrinology 2006; 83:289-94. [PMID: 16926531 DOI: 10.1159/000095339] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2006] [Accepted: 07/10/2006] [Indexed: 11/19/2022]
Abstract
BACKGROUND AND AIM The neurotransmitter histamine is involved in the regulation of appetite and in the development of age-related obesity in mice. Furthermore, histamine is a mediator of the anorexigenic action of leptin. The aim of the present study was to investigate a possible role of histamine in the development of high-fat diet (HFD)-induced obesity. METHODS Histamine-deficient histidine decarboxylase knock-out (HDC-KO) mice and C57BL/6J wild-type (WT) mice were given either a standard diet (STD) or HFD for 8 weeks. Body weight, 24-hour caloric intake, epididymal adipose tissue size, plasma leptin concentration and quantitative expression of leptin receptor (Ob-R) mRNA were measured. RESULTS Both HDC-KO and WT mice fed an HFD for 8 weeks increased their body weight significantly more than STD-fed mice. A significant difference in body weight gain between HDC-KO mice fed an HFD or an STD was seen after 2 weeks, whereas a significant difference in body weight gain was first observed after 5 weeks in WT mice. After 8 weeks 24-hour caloric intake was significantly lower in HFD- than in STD-fed WT mice. In HDC-KO mice no difference in caloric intake was observed between HFD- and STD-fed mice. After 8 weeks epididymal adipose tissue size and plasma leptin concentration had increased significantly in HFD-fed WT and HDC-KO mice compared to their STD-fed controls. Epididymal adipose tissue size was higher in HDC-KO than WT mice, both in STD- and HFD-fed mice. A significant decrease in Ob-R mRNA in HFD-fed HDC-KO mice compared to STD-fed HDC-KO mice was observed, while no such difference was observed in WT mice. CONCLUSION Based on our results, we conclude that histamine plays a role in the development of HFD-induced obesity.
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Affiliation(s)
- Emilie A Jørgensen
- Cluster for Molecular Imaging, Department of Medical Physiology, University of Copenhagen, Copenhagen, Denmark
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Nakamura E, Kataoka T, Furutani K, Jimbo K, Aihara T, Tanaka S, Ichikawa A, Ohtsu H, Okabe S. Lack of histamine alters gastric mucosal morphology: comparison of histidine decarboxylase-deficient and mast cell-deficient mice. Am J Physiol Gastrointest Liver Physiol 2004; 287:G1053-61. [PMID: 15271653 DOI: 10.1152/ajpgi.00353.2003] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Histamine plays an important role in the regulation of gastric acid secretion; however, its role in maintenance of gastric morphology remains unclear. To clarify the necessity of histamine for gastric mucosal development and maintenance, we evaluated two different kinds of mice that lacked either mast cells (one of the gastric histamine-producing cell types) or histidine decarboxylase (HDC; a histamine-synthesizing enzyme). Measurements of stomach weight, intragastric pH, mucosal histamine levels, as well as serum gastrin and albumin levels were performed in mice. Gastric mucosal appearance was examined by immunohistochemical techniques. Although gastric mucosal histamine levels in mast cell-deficient mice were half of those observed in the wild-type mice, intragastric pH, serum gastrin levels, and gastric morphology at 12 mo were unchanged compared with the wild-type mice. In contrast, HDC-deficient mice possessed no detectable gastric histamine, but did exhibit hypergastrinemia, as well as marked increases in intragastric pH and stomach weight compared with the wild-type mice. Histological analysis revealed that 9-mo-old HDC-deficient mice demonstrated hyperplasia in the oxyntic glandular base region, as well as increased numbers of parietal and enterochromaffin-like cells. These results indicate that enterochromaffin-like cell-derived histamine is potentially involved in gastric mucosal morphology regulation.
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Affiliation(s)
- Eiji Nakamura
- Department of Applied Pharmacology, Kyoto Pharmaceutical University, Misasagi, Yamashina, Kyoto 607-8414, Japan
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Iwabuchi K, Kubota Y, Ito C, Watanabe T, Watanabe T, Yanai K. Methamphetamine and Brain Histamine: A Study Using Histamine-Related Gene Knockout Mice. Ann N Y Acad Sci 2004; 1025:129-34. [PMID: 15542709 DOI: 10.1196/annals.1316.016] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The central histamine (HA) neurons that originate from the posterior hypothalamus modulate a variety of physiological functions. In order to investigate the roles of brain histaminergic neuron system in the behavioral effects of methamphetamine (METH), we administrated METH repeatedly to L-histidine decarboxylase (HDC)-, histamine H1 receptor-, H2 receptor-gene knockout (KO) mice, H1/H2 receptor-gene double KO mice, and wild type (WT) mice corresponding to each of them, and we measured locomotor activities. We also measured the contents of monoamines and amino acids in the brain of HDC-gene KO and WT mice after a single administration of METH. METH-induced locomotor hyperactivity and the development of behavioral sensitization were facilitated more in the HDC-gene KO mice and H1/H2 gene double KO mice than the WT mice, suggesting that brain histamine has an inhibitory effect on the METH action through both H1 and H2 receptors. In addition, neurochemical study suggested the involvement of the GABAergic neuron system in the inhibitory effect of brain histamine.
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Affiliation(s)
- Kentaro Iwabuchi
- Department of Psychiatry, Tohoku University School of Medicine, Aoba-ku, Sendai, Miyagi 980-8574, Japan.
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Bene L, Sápi Z, Bajtai A, Buzás E, Szentmihályi A, Arató A, Tulassay Z, Falus A. Partial protection against dextran sodium sulphate induced colitis in histamine-deficient, histidine decarboxylase knockout mice. J Pediatr Gastroenterol Nutr 2004; 39:171-6. [PMID: 15269623 DOI: 10.1097/00005176-200408000-00009] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
OBJECTIVES Chemically induced mucosal inflammation in animal models is a suitable tool for studying factors in the pathogenesis of inflammatory bowel disease. The aim of this study was to determine whether absence of histamine has an effect on the development of experimental colitis. METHODS Histamine-deficient, histidine decarboxylase (HDC) knockout Balb/c mice and genetically identical control animals with intact HDC were studied. Colitis was induced by the administration of 2% dextran sodium sulphate in drinking water. Mice were killed after 5 days and disease activity assessed by clinical, histologic, and immunohistologic parameters. Bacterial components of stool were examined. RESULTS Clinical disease activity was higher in the mice with intact HDC (disease activity index, 2.21) than in the histamine-deficient knock-out mice (1.88). Histologic findings were similar in the two groups. On day 5, the inflammation score of the HDC sufficient group was 5.25 (+/-1.055) and the crypt score was 5.00 (+/-1.128). The scores in the HDC knock-out group were 4.667 (+/- 0.707) and 4.667 (+/- 0.86), respectively. There was a significant difference in the number of interleukin (IL-10)-producing lymphocytes in colon mucosa. Large numbers of IL-10-positive lymphocytes were observed in wild type mice both those with DSS induced colitis and untreated controls. Only sporadic IL-10 positivity was found in histamine-deficient mice. Significant differences were found in the composition of the fecal bacterial flora between the two groups. CONCLUSION The reduced number of IL-10-positive lymphocytes in the intestinal mucosa of histamine-deficient, histidine decarboxylase knockout mice and the altered fecal bacterial flora in these animals suggest that histamine may play a role in the pathophysiology of inflammation in the colon of normal animals by upregulating local IL-10 production and stimulating a local shift to Th2 response.
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Affiliation(s)
- László Bene
- Peéterfy S. Hospital, Department of Gastroenterology, Budapest, Hungary
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Klausz G, Buzás E, Scharek P, Tiszlavicz L, Gyulai Z, Fülöp AK, Falus A, Mándi Y. Effects of Helicobacter pylori infection on gastric inflammation and local cytokine production in histamine-deficient (histidine decarboxylase knock-out) mice. Immunol Lett 2004; 94:223-8. [PMID: 15275970 DOI: 10.1016/j.imlet.2004.05.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2003] [Revised: 05/03/2004] [Accepted: 05/05/2004] [Indexed: 10/26/2022]
Abstract
UNLABELLED Helicobacter pylori infection in humans causes gastritis. The infection elicits a complex immune response in which the activation of mast cells and histamine release is of particular importance. Histamine further promotes the immune response and stimulates gastric acid secretion. The inflammatory effects of H. pylori can be studied in intragastrically infected mice. The aim of this study was to compare the local cytokine responses of histamine-deficient, histidine decarboxylase knock-out (HDC KO) and wild-type (WT) mice following H. pylori infection. METHODS H. pylori was administered intragastrically to HDC KO and WT mice. The animals were infected three times in a 1-week-period and were sacrificed 8 weeks after the first intervention. The local TNF-alpha, IL-6 and IL-10 cytokine levels in gastric mucosal specimens were determined by ELISA. Gastric mucosa sections were also analysed for histological signs of inflammation. To investigate the antibody response following H. pylori infection, the total anti-H. pylori IgG and the ratio of IgG1/IgG2a isotypes were determined in the serum by ELISA. RESULTS H. pylori induced considerable cytokine production in the infected groups. The TNF-alpha and IL-6 levels were significantly higher in the WT mice than in the HDC KO mice, whereas the IL-10 levels did not differ between the groups. Anti-H. pylori IgG was detected only in the infected groups and the titre was higher in the WT mice. A higher IgG1/IgG2a ratio was observed in the H. pylori infected HDC KO group. Histological analysis revealed that the grades of inflammation were less severe in the infected HDC KO animals. CONCLUSIONS The results suggest that H. pylori induces lower TNF-alpha and IL-6 secretion in the gastric mucosa in the HDC KO mice than in the WT animals, while the levels of induction of IL-10 were similar. The imbalance between Th1/Th2 is less pronounced in the HDC KO mice, which might explain the milder inflammation in the gastric mucosa. These results provide further information on the role of histamine in the pathomechanism of H. pylori-induced gastritis.
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Affiliation(s)
- Gergely Klausz
- Department of Medical Microbiology and Immunobiology, Faculty of Medicine, University of Szeged, Dóm tér 10, H6720 Szeged, Hungary
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GOZSY B, KATO L. Capillary response in serotonine and histamine depleted rats. Indian J Med Res 1960; 48:115-20. [PMID: 13828653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/24/2023] Open
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