論文 - 森脇　康博

Non-neuronal cholinergic system in regulation of immune function with a focus on α7 nAChRs.

Kawashima Koichiro, Fujii Takeshi, Moriwaki Yasuhiro, Misawa Hidemi, Horiguchi Kazuhide.

International Immunopharmacology 29 （ 1 ）  2015年02月

研究論文（学術雑誌）, 共著,  ISSN  1567-5769

　概要を見る

<p>In 1929, Dale and Dudley described the first reported natural occurrence of acetylcholine (ACh) in an animal's body. They identified this ACh in the spleens of horses and oxen, which we now know suggests possible involvement of ACh in the regulation of lymphocyte activity and immune function. However, the source and function of splenic ACh were left unexplored for several decades. Recent studies on the source of ACh in the blood revealed ACh synthesis catalyzed by choline acetyltransferase (ChAT) in CD4&lt;sup&gt;+&lt;/sup&gt; T cells. T and B cells, macrophages and dendritic cells (DCs) all express all five muscarinic ACh receptor subtypes (mAChRs) and several subtypes of nicotinic AChRs (nAChRs), including α7 nAChRs. Stimulation of these mAChRs and nAChRs by their respective agonists causes functional and biochemical changes in the cells. Using AChR knockout mice, we found that M&lt;inf&gt;1&lt;/inf&gt;/M&lt;inf&gt;5&lt;/inf&gt; mAChR signaling up-regulates IgG&lt;inf&gt;1&lt;/inf&gt; and pro-inflammatory cytokine production, while α7 nAChR signaling has the opposite effect. These findings suggest that ACh synthesized by T cells acts in an autocrine/paracrine fashion at AChRs on various immune cells to modulate immune function. In addition, an endogenous allosteric and/or orthosteric α7 nAChR ligand, SLURP-1, facilitates functional development of T cells and increases ACh synthesis via up-regulation of ChAT mRNA expression. SLURP-1 is expressed in CD205&lt;sup&gt;+&lt;/sup&gt; DCs residing in the tonsil in close proximity to T cells, macrophages and B cells. Collectively, these findings suggest that ACh released from T cells along with SLURP-1 regulates cytokine production by activating α7 nAChRs on various immune cells, thereby facilitating T cell development and/or differentiation, leading to immune modulation.</p>

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