MSD Manual

Please confirm that you are not located inside the Russian Federation

honeypot link

Variably Protease-Sensitive Prionopathy (VPSPr)

By

Pierluigi Gambetti

, MD, Case Western Reserve University

Last full review/revision Jun 2020| Content last modified Jun 2020
Click here for the Professional Version

Variably protease-sensitive prionopathy is a prion disease that causes changes in mood and behavior, problems speaking, and impaired mental function.

Variably protease-sensitive prionopathy was identified in 2008. It accounts for about 3% of all prion diseases Overview of Prion Diseases Prion diseases are rare progressive, fatal, and currently untreatable degenerative disorders of the brain (and rarely of other organs) that result when a protein changes into an abnormal form... read more in people and affects about 1 to 2 of every 100 million people. It typically develops around age 70, and life expectancy is about 24 months after symptoms develop.

Researchers have not identified any gene mutation that causes this disease. But variably protease-sensitive prionopathy is considered different from other prion disease because in it, enzymes called proteases can break the prions down more easily than occurs in other prion diseases.

At first, people with variably protease-sensitive prionopathy usually have changes in mood and behavior. They may lose their inhibitions, have intense feelings of well-being (euphoria), lose interest in their usual activities, or become listless. They may have problems speaking and may become uncoordinated. Mental function is impaired. Walking eventually becomes difficult.

Variably protease-sensitive prionopathy is especially difficult to diagnose and is often mistaken for another dementia.

There is no effective treatment for variably protease-sensitive prionopathy. Treatment focuses on relieving symptoms.

NOTE: This is the Consumer Version. DOCTORS: Click here for the Professional Version
Click here for the Professional Version
Others also read
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID

Test your knowledge

Brain
The brain consists of the cerebrum, brain stem, and cerebellum. It requires constant nourishment provided by a continual flow of blood and oxygen from the heart. Approximately how much of the blood pumped by the heart goes to the brain?
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID

Also of Interest

Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
TOP