Prohibitin

Prohibitin (also known as PHB) is a protein that in humans is encoded by the PHB gene. It is a highly conserved protein, found in a wide range of species from humans to yeast. Prohibitin has been implicated in a variety of cellular functions, including mitochondrial integrity, cell cycle regulation, and apoptosis.

Function

Prohibitin is a ubiquitously expressed protein that is located primarily in the mitochondria. It forms a ring-like structure in the inner mitochondrial membrane, where it functions to maintain mitochondrial integrity and function. Prohibitin is also found in the nucleus and plasma membrane, suggesting that it may have additional roles outside of the mitochondria.

In addition to its role in mitochondrial function, prohibitin has been implicated in the regulation of cell cycle progression and apoptosis. It has been shown to inhibit cell proliferation and to promote cell cycle arrest in the G0/G1 phase. Prohibitin has also been shown to have anti-apoptotic activity, protecting cells from apoptosis induced by various stimuli.

Clinical significance

Alterations in prohibitin expression have been associated with a variety of diseases, including cancer, obesity, and aging. Overexpression of prohibitin has been observed in several types of cancer, including breast cancer, ovarian cancer, and lung cancer, and has been associated with poor prognosis. In contrast, reduced expression of prohibitin has been associated with obesity and aging.

Research

Research into the function and regulation of prohibitin is ongoing. Current areas of interest include the role of prohibitin in mitochondrial function and cell cycle regulation, the mechanisms by which prohibitin expression is altered in disease, and the potential use of prohibitin as a therapeutic target in cancer and other diseases.

See also

• Mitochondria
• Cell cycle
• Apoptosis
• Cancer
• Obesity
• Aging