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Isolation and characterization of PZ-peptidase in developing rat brain
T Chikuma1, Y Ishii, T Miyauchi
1Department of Pharmaceutical Analytical Chemistry, Showa College of Pharmaceutical Sciences, Tokyo 154, Japan.
Neurochemistry International
|May 22, 2010
Summary
PZ-peptidase activity in developing rat brain regions generally decreases with age, with the pituitary gland showing the highest levels. This collagen-degrading enzyme
Area of Science:
- Biochemistry
- Neuroscience
- Enzymology
Background:
- Collagenases play crucial roles in tissue remodeling and development.
- PZ-peptidase is a specific type of collagen peptidase.
- Understanding brain enzyme activity during development is vital for neuroscience research.
Purpose of the Study:
- To investigate the developmental changes in PZ-peptidase activity across various rat brain regions.
- To characterize the biochemical properties of rat brain PZ-peptidase.
- To compare brain PZ-peptidase with its peripheral counterparts.
Main Methods:
- Assay of PZ-peptidase activity using a synthetic substrate [4-Phenylazobenzyloxycarbonyl(PZ)-l-Pro-l-Leu-Gly-l-Pro-l-Arg].
- Analysis of enzyme activity in different brain regions (hypothalamus, pons-medulla, colliculi, cerebellum, cerebrum, midbrain, pituitary gland) from rats of varying ages (1 week to adult).
- Biochemical characterization including pH optimum, inhibition studies (p-chloromercuribenzoic acid, N-ethylmaleimide, EDTA, iodoacetic acid, metal ions, serine protease inhibitors), and molecular weight estimation (gel filtration).
Main Results:
- PZ-peptidase activity decreased with maturation in most brain regions, except the hypothalamus.
- The pituitary gland exhibited the highest PZ-peptidase activity.
- The enzyme's properties (optimum pH 7.5-8.0, inhibition by certain agents, molecular weight ~68,000) were similar to peripheral PZ-peptidases.
Conclusions:
- Rat brain PZ-peptidase activity declines during development, with notable regional differences.
- The pituitary gland is a significant site of PZ-peptidase activity in the brain.
- Brain PZ-peptidase likely shares molecular identity with peripheral enzymes but may possess distinct physiological functions in the central nervous system.
