Procollagen
A precursor (forerunner) of collagen, the protein that adds strength and support to many body tissues.
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- Proctitis
Inflammation of the rectum. Proctitis may be due to a considerable number of causes, including infectious agents and ulcerative colitis. Infectious proctitis is often due to agents such as Chlamydia trachomatis, Neisseria gonorrheae, and herpes simplex virus, all of which can be acquired during anoreceptive intercourse. Proctitis is also a hallmark of ulcerative colitis, in […]
- Proctitis, ulcerative
Ulcerative colitis that is limited to the rectum. Ulcerative colitis itself is a relatively common disease involving inflammation of the large intestine (the colon). The cause is unknown. It is a form of inflammatory bowel disease and has some similarity to a related disorder, Crohn’s disease. The end of the colon (the rectum) is always […]
- Proctology
A medical specialty that deals with disorders of the rectum and anus.
- Proctosigmoidoscopy
An examination of the rectum and the lower part of the colon, using a thin, lighted instrument called a sigmoidoscope.
- Prodrug
A precursor (forerunner) of a drug. A prodrug must undergo chemical conversion by metabolic processes before becoming an active pharmacological agent. For example, sulfasalazine is a prodrug. It is not active in its ingested form. It has to be broken down by bacteria in the colon into two products — 5-aminosalicylic acid (5ASA) and sulfapyridine […]