Marker enzyme for plasma membrane is:
**Question:** Marker enzyme for plasma membrane is:
A. Acetylcholinesterase (AChE)
B. Glucose transporter (GLUT)
C. Adrenaline transporter (ADREN)
D. Carbonic anhydrase (CA)
**Correct Answer:** .
**Core Concept:** Marker enzymes are specific proteins that are present in a particular cell type or organelle, and their detection can provide information about the histopathological status of that cell type or organelle. In the context of plasma membrane, we are interested in enzymes that are either integral to the membrane or peripherally associated with it.
**Why the Correct Answer is Right:** Acetylcholinesterase (AChE) is a peripheral membrane-bound enzyme that plays a crucial role in the breakdown of the neurotransmitter acetylcholine (ACh) at the neuromuscular junction. AChE is present in a specific pattern in the peripheral nervous system, particularly in cholinergic neurons, and its detection can serve as a marker for the presence of these neurons.
**Why Each Wrong Option is Incorrect:**
B. Glucose transporter (GLUT): GLUTs are proteins responsible for facilitating the transport of glucose across cell membranes, primarily in the context of glucose homeostasis in cells. They are not specific markers for plasma membrane or any particular cell type.
C. Adrenaline transporter (ADREN): ADREN is not a known enzyme or marker related to plasma membrane or specific cell types; it seems to be a misspelling or non-medical term.
D. Carbonic anhydrase (CA): Carbonic anhydrases are a family of enzymes that catalyze the reversible hydration of carbon dioxide in various biological processes. They are not specific markers for plasma membrane or any particular cell type.
**Clinical Pearl:** AChE is a valuable marker enzyme for cholinergic neurons and can be used in neuropathological evaluations, particularly in Alzheimer's disease, where its decrease in brain tissue is observed. Understanding marker enzymes like AChE aids in the diagnosis and characterization of various neurological conditions, contributing to a comprehensive clinical assessment.