The characterization of growth factor activity in human brain

Area of Science:

• Neuroscience
• Biochemistry
• Cell Biology

Background:

• Fibroblast growth factor (FGF) purification from bovine brain was previously reported.
• Bovine brain FGF consists of fragments derived from myelin basic protein.
• Myelin basic protein is a key component of the myelin sheath in the central nervous system.

Purpose of the Study:

• To isolate and characterize growth factors from human brain.
• To investigate the relationship between human brain growth factors and myelin basic protein.
• To identify the properties and potential diversity of brain-derived growth factors.

Main Methods:

• Purification of growth factor activity from human brain extracts using chromatographic procedures.
• Isoelectric focusing to separate mitogenic activity from myelin basic protein.
• Analysis of isoelectric points (pI) to characterize identified growth factors.

Main Results:

• A fraction enriched in growth factor activity was isolated from human brain.
• Mitogenic activity could not be resolved from myelin basic protein by chromatography.
• Isoelectric focusing successfully dissociated the mitogen from myelin basic protein.
• At least two potent growth factors with distinct pI values (7.2–7.4 and 8.1–8.6) were identified.

Conclusions:

• Human brain contains potent growth factors separable from myelin basic protein.
• At least two distinct growth factors with different isoelectric points exist in the human brain.
• The human brain likely harbors a variety of growth factors, suggesting complex regulatory roles.