Diminished antigen-specific IgG1 and interleukin-6 production and acetylcholinesterase expression in combined M1 and M5 muscarinic acetylcholine receptor knockout mice
| Autor: | Koichiro Kawashima, Ayako Tashiro, Kumiko Arimoto, Yasuhiro Moriwaki, Tadashi Kasahara, Yoshihito X. Fujii, Hidemi Misawa, Minoru Matsui, Hirofumi Fujigaya, Takeshi Fujii |
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| Rok vydání: | 2007 |
| Předmět: |
Male
medicine.medical_specialty Ovalbumin medicine.medical_treatment Immunology Enzyme-Linked Immunosorbent Assay Biology Gene Expression Regulation Enzymologic Choline O-Acetyltransferase Interferon-gamma Mice Immune system Internal medicine Muscarinic acetylcholine receptor medicine Immunology and Allergy Animals Lymphocytes RNA Messenger Acetylcholine receptor Mice Knockout Receptor Muscarinic M5 Interleukin-6 Reverse Transcriptase Polymerase Chain Reaction Receptor Muscarinic M1 Interleukin Choline acetyltransferase Mice Inbred C57BL Cytokine Endocrinology Neurology Immunoglobulin G Acetylcholinesterase Female Neurology (clinical) CD8 Acetylcholine medicine.drug |
| Zdroj: | Journal of neuroimmunology. 188(1-2) |
| ISSN: | 0165-5728 |
| Popis: | Immunological activation of T cells enhances synthesis of acetylcholine (ACh) and transcription of choline acetyltransferase (ChAT), M5 muscarinic ACh receptor (mAChR) and acetylcholinesterase (AChE). Stimulation of mAChRs on T and B cells causes oscillating Ca2+-signaling and up-regulation of c-fos expression; moreover, M1 mAChRs play a crucial role in the differentiation of CD8+ T cells into cytolytic T lymphocytes. Collectively, these findings suggest that immune cell function is regulated by its own cholinergic system. Bearing that in mind, we tested whether immune function can be regulated via mAChR-mediated pathways by immunizing combined M1 and M5 mAChR knockout (M1/M5 KO) and wild-type (WT) C57BL/6JJcl mice with ovalbumin (OVA) and measuring serum IgG1 and IgM 1 wk later. We found that serum levels of total and anti-OVA-specific IgG1 were significantly lower in M1/M5 KO than WT mice, though there was no difference in serum levels of total and anti-OVA-specific IgM between the two genotypes. Secretion of interleukin (IL)-6 from activated spleen cells was significantly reduced in M1/M5 KO mice, whereas there was no significant change in gamma interferon secretion. Expression of AChE mRNA was significantly reduced in activated spleen cells from M1/M5 KO mice. These results suggest that M1 and/or M5 mAChRs are involved in regulating cytokine (e.g., IL-6) production, leading to modulation of antibody class switching from IgM to IgG1, but are not involved in the initial generation of the antibody response. They also support the notion that a non-neuronal cholinergic system is involved in regulating immune cell function. |
| Databáze: | OpenAIRE |
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