…Lymphocytes are small, round, and basophilic lymphocytes, also called thymocytes. They come from the bone marrow and reside here, becoming thymus-derived lymphocytes (T-cells). Epithelial reticulum cells originate from the gill pouch epithelium, are endodermal, large, irregularly shaped, and secrete peptide hormones (thymosin, thymopoietin, etc.). … From [Immunology]…Both are collectively called lymphocytes that differentiate from ancestor cells called hematopoietic stem cells in the bone marrow, but they are functionally completely different. One is called a T cell, which is a small lymphocyte that enters the thymus (the T in T cell comes from thymus) located in the chest cavity and differentiates under the influence of the thymic epithelium. After passing through the thymus, it is distributed to specific parts of peripheral lymph organs such as lymph nodes and the spleen (thymus-dependent areas). The other cell is called a B cell, which means it originates from the bone marrow, and is derived directly from hematopoietic stem cells (however, in birds, it differentiates under the influence of the bursa of Fabricius near the cloaca), and is also a small lymphocyte that gathers in the peripheral lymphatic tissue. … *Some of the terminology that mentions "T-cell" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…リンパ球は小リンパ球で,丸く小さく好塩基性を示し,胸腺細胞thymocyteともよばれる。骨髄から来てここに宿り,胸腺由来リンパ球thymus‐derived lymphocyte(T細胞T‐cellのこと)となる。上皮性細網細胞epithelial reticulum cellは鰓囊上皮に由来し,内胚葉性で,大きく不正形で,ペプチド性のホルモン(サイモシンthymosin,サイモポイエチンthymopoietinなど)を分泌する。… 【免疫】より…いずれも骨髄の造血幹細胞と呼ばれる祖先細胞から分化したリンパ球と総称される細胞であるが,機能的にはまったく異なっている。一つはT細胞T cellと呼ばれる細胞で,胸腔内に位置する胸腺thymus(T細胞のTはthymusに由来する)に入って,胸腺上皮の影響下で分化した小型のリンパ球で,胸腺を経由したのちはリンパ節,脾臓などの末梢のリンパ臓器の特定の部位(胸腺依存域)に分布する。もう一つの細胞は骨髄bone marrowに由来するという意味からB細胞と呼ばれ,造血幹細胞に直接由来するもので(ただし鳥類では,総排出腔の近くにあるファブリキウス囊の影響下で分化する),末梢リンパ組織に集まった,同じく小型のリンパ球である。… ※「T-cell」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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