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Innate Imunologi

Innate immunity provides the early defense against microbes through cellular and biochemical mechanisms that are always present and react quickly but non-specifically to infections. Adaptive immunity develops over time with exposure to microbes and has a more specific response that increases in strength with repeated exposures to the same microbe. Together, innate and adaptive immunity provide coordinated defense against invading microbes.

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12 views1 page

Innate Imunologi

Innate immunity provides the early defense against microbes through cellular and biochemical mechanisms that are always present and react quickly but non-specifically to infections. Adaptive immunity develops over time with exposure to microbes and has a more specific response that increases in strength with repeated exposures to the same microbe. Together, innate and adaptive immunity provide coordinated defense against invading microbes.

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Laras
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Imunologi

INNATE AND ADAPTIVE IMMUNITY


Defense against microbes is mediated by the early reactions of innate immunity and the later responses of
adaptive immunity (Fig. 1-1 and Table 1-2). Innate
immunity (also called natural or native immunity) provides the early line of defense against microbes. It consists of
cellular and biochemical defense mechanisms
that are in place even before infection and are poised to
respond rapidly to infections. These mechanisms react
only to microbes (and to the products of injured cells),
and they respond in essentially the same way to repeated
infections. The principal components of innate immunity are (1) physical and chemical barriers, such as
epithelia and antimicrobial substances produced at
epithelial surfaces; (2) phagocytic cells (neutrophils,
macro phages) and natural killer (NK) cells; (3) blood
proteins, including members ofthe complement system
and other mediators of inflammation; and (4) proteins
called cytokines that regulate and coordinate many of
the activities of the cells of innate immunity. The mechanisms of innate immunity are specific for structures
that are common to groups of related microbes and
may not distinguish fine differences between foreign
substances.
In contrast to innate immunity, there are other
immune responses that are stimulated by exposure to
infectious agents and increase in magnitude and defensive capabilities with each successive exposure to a particular
microbe. Because this form of immunity develops
as a response to infection and adapts to the infection, it
is called adaptive immunity. The defining characteristics of adaptive immunity are exquisite specificity

Innate imunologi

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