Cell-Mediated Immunity
Cell-mediated immunity (CMI) is a specific type of acquired immune
response not mediated by antibodies but by sensitized T cells. This form of
immunity is transferred from donor to recipient, not with antisera but with
intact lymphocytes; hence it is called cell-mediated immune reaction. CMI
performs the following immunological functions:
a)
It confers immunity in diseases caused by
obligate intracellular bacteria (Mycobacterium
tuberculosis, Mycobacterium leprae,
Brucella, etc.), viruses (small pox, measles, mumps,
etc.), fungi(Histoplasma capsulatum, Blastomyces dermatitidis, Coccidioidesimmitis, etc.), and
parasites (Toxoplasma gondii, Leishmania donovani, etc.).
b)
It participates in immunological surveillance and immu-nity against
cancer.
c)
It plays an important role in pathogenesis of delayed
hypersensitivity reactions and in pathogenesis of certain autoimmune diseases,
such as autoimmune thyroiditis, encephalitis, etc.
Related Topics
Privacy Policy, Terms and Conditions, DMCA Policy and Compliant
Copyright © 2018-2024 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.