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Histologia Básica, Texto e Atlas - 12ª Edição - Junqueira & Carneiro

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<strong>Histologia</strong> <strong>Básica</strong><br />

Enterócito<br />

lgA lgA lgA<br />

Macrófago<br />

Linfócitos B e T<br />

Célula<br />

dendrltica<br />

Figura 14.40 Atividade Imunitária do Intestino delgado. As células M<br />

células dendriticas adjacentes. Esses três tipos celulares são levados pela linfa e vão estimular 1<br />

das placas de Peyer capturam antígenos do lúmen intestinal e os transferem para os linfócitos, macrófagos e<br />

infódtos de outros locais, principalmente da própria mucosa do Intestino. Os linfócitos B<br />

mucosa origlnam plasmócitos produtores de lgA (lgA secretora ou S-lgA). Os plasmódtos da mucosa do intestino produzem grande quantidade de anticorpo~ devido~ extensão dessa<br />

mucosa e sua proxlmldade com os antígenos lntroduzldos no trato digestivo com os alimentos.<br />

da<br />

base da língua, sendo recobertas por epitélio estratificado<br />

plano. Em cada tonsila, o epitélio forma uma invaginação<br />

que se aprofunda muito, originando uma cripta.<br />

~ Bibliografia<br />

Abbas AI< et aL: Cellular and Molecular lmmunology. 2nd ed Saunders,<br />

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Alberts B et aL: Thc immune system. ln: Mokcular Biology of lhe Cel/,<br />

3rd ed Garland, 1994.<br />

Austyn JM, Wood K): Principies of Cellular and Mokcular Immunology.<br />

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dendritic cells. Current Opin Immu11ology 1997;9:10.<br />

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node, a review and a question: Is their activity antigen specilic?<br />

Anal Rec l 966;245:593.<br />

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