Name an immune immunosupressive agent?

NCERT Exemplar · Q35

Q. Name an immune immunosupressive agent?

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Concept understanding — Antibiotic Producing Fungi

Imagine you have a wound that gets infected. Before the 20th century, that infection could easily kill you. Today, we have a weapon against such bacterial infections: antibiotics. The most famous antibiotic, penicillin, comes from a humble source — a fungus.

The intuition is simple: in nature, fungi and bacteria are rivals. They compete for the same food and space. To win this battle, some fungi have evolved a chemical weapon. They produce a substance that kills bacteria or stops them from growing. That substance is an antibiotic. So, an antibiotic-producing fungus is simply a fungus that manufactures a natural chemical to destroy or weaken bacteria.

The precise meaning is this: certain species of fungi (like Penicillium notatum or Cephalosporium acremonium) secrete secondary metabolites — chemicals not essential for their own growth — that are toxic to bacteria. These chemicals interfere with a bacterium's cell wall, its protein-making machinery, or its DNA replication. Because bacterial cells are structurally different from human cells, the antibiotic can often kill the invader without harming us.

Why does this matter? It is the foundation of modern medicine. The discovery of penicillin by Alexander Fleming in 1928 was a turning point. Before antibiotics, a simple scratch could lead to sepsis. Today, antibiotics from fungi save millions of lives every year. They are used to treat pneumonia, tuberculosis, wound infections, and many other bacterial diseases.

Important

Antibiotics are effective only against bacteria, not against viruses (like the common cold or flu). Taking an antibiotic for a viral infection is useless and contributes to a serious problem called antibiotic resistance — where bacteria evolve to become immune to the drug.

Here are the key points to remember:

Source: The most famous antibiotic-producing fungus is Penicillium, which gives us penicillin. Another is Cephalosporium, which produces cephalosporins. …

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Cyclosporin A, produced by the fungus Trichoderma polysporum, is a vital immunosuppressive agent used to prevent organ rejection in transplant patients.

Microorganisms, particularly fungi, are remarkable factories for a vast array of bioactive molecules that have profoundly impacted human health. While their role in producing antibiotics like penicillin is widely known, their utility extends far beyond combating bacterial infections. Scientists have continuously explored these microbial sources to discover compounds with diverse therapeutic applications, leading to breakthroughs in areas such as immunology.

One such crucial discovery is Cyclosporin A. This powerful compound is not an antibiotic, but rather an immunosuppressive agent, meaning it works to dampen or suppress the body's immune response. Its origin is fascinating: it is produced by a specific fungus known as Trichoderma polysporum.

Important

Cyclosporin A is derived from the fungus Trichoderma polysporum.

The primary and most critical application of Cyclosporin A lies in the field of organ transplantation. When a patient receives an organ from a donor, their immune system naturally recognizes the transplanted organ as "foreign" because it carries different genetic markers (antigens) than the recipient's own cells. This recognition triggers a robust immune response aimed at attacking and rejecting the new organ, a process known as transplant rejection. …

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Q.Name an immune immunosupressive agent?

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