Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «P»:
Prograf: Brand name of tacrolimus. See: Tacrolimus....
Programmed cell death
Programmed cell death: A term often used interchangeably with apoptosis. See: Apoptosis....
Progressive: Increasing in scope or severity. Advancing. Going forward. In medicine, a disease that is progressive is going from bad to worse....
Progressive cardiomyopathic lentiginosis
Progressive cardiomyopathic lentiginosis: See: LEOPARD syndrome....
Progressive dementia with cerebellar ataxia
Progressive dementia with cerebellar ataxia: See: Gerstmann-Straussler-Scheinker syndrome....
Progressive infantile poliodystrophy
Progressive infantile poliodystrophy, Alpers: A progressive disease of the nervous system characterized by spasticity (tightness), myoclonus and dementia and by liver problems with jaundice and cirrhosis. This disorder, first described by Alpers in 1931 as "Diffuse progressive degeneration of gray m...
Progressive multifocal leukoencephalopathy
Progressive multifocal leukoencephalopathy: A rapidly progressive, often fatal viral infection of the brain. Commonly abbreviated as PML.
PML is believed to be due to the Jacob-Creutzfeldt (JC) papovavirus. The virus infects oligodendrocytes (support cells in the brain).
The signs and symptoms of PM...
Progressive supranuclear palsy
Progressive supranuclear palsy: A neurologic disorder of unknown origin that gradually destroys cells in many areas of the brain, leading to serious and permanent problems with the control of gait and balance. The most obvious sign of the disease is an inability to aim the eyes properly, which occur...
Progressive vaccinia: A severe complication of smallpox vaccination that occurs because of an immune defect in the vaccinated individual or in a susceptible contact of that person. In progressive vaccinia, the primary vaccination site does not heal but rather expands with extensive necrosis (death o...
Proinflammatory: Capable of promoting inflammation. For example, air pollution may have proinflammatory effects....
Prokaryote: A unicellular organism lacking a nuclear membrane, a discrete nucleus, and other specialized compartments within the cell. Bacteria and viruses are prokaryotes.
It appears that life arose on earth about 4 billion years ago. The simplest of cells, and the first types of cells to evolve, w...
Prokaryotic: Pertaining to prokaryotes....
Prolactin: A hormone secreted by the pituitary gland. Prolactin stimulates lactation (milk production). It also has many other functions, including essential roles in the maintenance of the immune system.
Abnormally high prolactin can delay puberty, interfere with ovulation in women, decrease lib...
Proliferative: Growing and increasing in number rapidly.
For example, the lymphoproliferative disorders are diseases in which there is malignant growth of lymphoid cells and of cells from the reticuloendothelial system (which take up and sequester inert particles).
As another example, the myeloprol...
Proline: An amino acid, one of the 20 building blocks of protein. A dietary nonessential amino acid, proline is a major constituent of collagen. Symbol: Pro....