Microcheck 196

Skin is the most difficult barrier for a microbe to penetrate. Some pathogens induce mucosal epithelial cells to engulf the bacterium. Some pathogens exploit antigen-sampling processes, including transcytosis by M cells and phagocytosis.

■ How do Shigella species enter intestinal epithelial cells?

■ Why does Mycobacterium tuberculosis facilitate its own uptake by macrophages?

■ Why would some pathogens behave differently in a non-human host?

Bacteria move from cell to cell propelled by actin filaments.

(c) Pathogen (bacteria) released from macrophages enters host cells by endocytosis.

Tissue inside Mucous Membrane

Figure 19.6 Antigen-Sampling Processes Provide a Mechanism for Invasion Shigella species use M cells to traverse the epithelial barrier. Once on the other side, macrophages ingest them, but the bacteria are able to escape and then infect other cells.

Caring For Your Lawn

Caring For Your Lawn

The Secret of A Great Lawn Without Needing a Professional You Can Do It And I Can Show You How. A Great Looking Lawn Doesn't Have To Cost Hundreds Of Dollars Or Require The Use Of A Professional Lawn Care Service. All You Need Is This Incredible Book.

Get My Free Ebook

Post a comment