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Neuropeptide enzyme hydrolysis in human saliva
1Dipartimento di Neuroscienze, Università degli Studi di Roma "Tor Vergata", 00133, Roma, Italy.
Archives of Oral Biology
|June 28, 2000
Summary
Human saliva partially hydrolyzes neuropeptides like leucine enkephalin, indicating the presence of key enzymes. Saliva composition, particularly enzyme activity and inhibitors, varies between sexes, affecting neuropeptide degradation.
Area of Science:
- Biochemistry
- Enzymology
- Human Physiology
Background:
- Neuropeptides play crucial roles in physiological processes.
- The degradation of neuropeptides in the oral cavity is not fully understood.
- Human saliva contains various enzymes and small molecules that could influence neuropeptide stability.
Purpose of the Study:
- To investigate the hydrolysis of neuropeptides by human saliva.
- To identify the types of enzymes involved in neuropeptide degradation in saliva.
- To explore potential differences in saliva's hydrolytic activity between sexes.
Main Methods:
- Leucine enkephalin was used as a model neuropeptide substrate.
- Saliva samples from male and female donors were analyzed.
- Enzyme activity and the presence of low molecular-weight inhibitors were assessed.
Main Results:
- Human saliva demonstrated partial hydrolysis of leucine enkephalin.
- The formation of hydrolysis by-products indicated the presence of aminopeptidases, dipeptidylaminopeptidases, and dipeptidylcarboxypeptidases.
- Enzyme activity was higher in male saliva, while female saliva showed higher inhibitory activity from low molecular-weight substances.
Conclusions:
- Human saliva possesses enzymatic machinery capable of degrading neuropeptides.
- Low molecular-weight substances in saliva act as inhibitors of neuropeptide-degrading enzymes.
- Sex-based differences in saliva composition influence neuropeptide hydrolysis rates.