사이토카인
사이토카인과 호르몬의 차이
1. 사이토카인은 autocrine signaling .. 호르몬은 혈류를 타고 멀리 작용
2. 사이토카인은 면역계에 주로 작용, 호르몬은 전신에 다양한 작용..???
사이토카인(cytokine)은 면역 세포가 분비하는 단백질을 통틀어 일컫는 말이다. 사이토카인은 세포로부터 분비된 후 다른 세포나 분비한 세포 자신에게 영향을 줄 수 있다. 즉, 대식세포의 증식을 유도하거나 분비 세포 자신의 분화를 촉진하기도 한다.
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Cytokines (Greek:Cyto from Greek "κύτταρο" kyttaro "cell" + Kines from Greek "κίνηση" kinisi "movement") are a broad and loose category of small proteins (~5–20 kDa) that are important in cell signaling. They are released by cells and affect the behavior of other cells. Cytokines can also be involved in autocrine signaling. Cytokines include chemokines, interferons, interleukins, lymphokines, tumour necrosis factor but generally not hormones or growth factors (despite some terminologic overlap).
Cytokines are produced by a broad range of cells, including immune cells like macrophages, B lymphocytes, T lymphocytes and mast cells, as well as endothelial cells, fibroblasts, and various stromal cells; a given cytokine may be produced by more than one type of cell.[1][2][3]
They act through receptors, and are especially important in the immune system; cytokines modulate the balance between humoral and cell-based immune responses, and they regulate the maturation, growth, and responsiveness of particular cell populations. Some cytokines enhance or inhibit the action of other cytokines in complex ways.[3]
They are different from hormones, which are also important cell signaling molecules, in that hormones circulate in much lower concentrations and hormones tend to be made by specific kinds of cells. They are important in health and disease, specifically in host responses to infection, immune responses, inflammation, trauma, sepsis, cancer, and reproduction.
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