The effect of physical exercise on salivary secretion of MUC5B, amylase and lysozyme.
OBJECTIVE
Saliva secretion is regulated by the autonomic nervous system. Parasympathic stimuli increase the secretion of water and mucin MUC5B, whereas sympathetic stimuli such as physical exercise increase the secretion of amylase and other proteins. In the present study we investigated the effect of physical exercise, as a sympathetic stimulus, on salivary flow rate and output of MUC5B, amylase, lysozyme and total protein.


METHODS
Unstimulated whole saliva was collected before exercise (1), after 10 min exercise with moderate intensity by running with a heart rate around 130 beats per minute (2), followed by 10 min exercise with high intensity by running to exhaustion (3) and after 30 min recovery (4). Salivary flow rate, protein and MUC5B concentration, and amylase and lysozyme activity were determined. Saliva protein composition was analysed using SDS-PAGE and immunoblotting.


RESULTS
Salivary flow rate, protein and lysozyme secretion increased after exercise with moderate intensity and increased further after exercise with high intensity (p<0.01). Amylase and MUC5B increased after exercise with moderate intensity (p<0.0001), but did not differ significantly between moderate and high exercise intensity. SDS-PAGE analysis and immunoblotting showed that, especially after exercise with high intensity, the concentrations of several other salivary proteins, including MUC7, albumin, and extra-parotid glycoprotein, also increased.


CONCLUSIONS
Exercise may not only lead to the anticipated increase in amylase and protein secretion, but also to an increase in salivary flow rate and MUC5B secretion.
Department of Oral Biochemistry, Academic Centre for Dentistry Amsterdam, Amsterdam, The Netherlands. Electronic address: a.ligtenberg@acta.nl.
Antoon J M
AJ
Ligtenberg
Department of Oral Biochemistry, Academic Centre for Dentistry Amsterdam, Amsterdam, The Netherlands.
Henk S
HS
Brand
Department of Oral Biochemistry, Academic Centre for Dentistry Amsterdam, Amsterdam, The Netherlands.
Petra A M
PA
van den Keijbus
Department of Oral Biochemistry, Academic Centre for Dentistry Amsterdam, Amsterdam, The Netherlands.
Enno C I
EC
Veerman
D000328:Adult; D000418:Albumins / Q000378:metabolism; D000681:Amylases / Q000378:metabolism*; D015308:Anaerobic Threshold; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D055257:Mucin-5B / Q000378:metabolism*; D009077:Mucins / Q000378:metabolism; D009113:Muramidase / Q000378:metabolism*; D012463:Saliva / Q000378:metabolism*; D012471:Salivary Proteins and Peptides / Q000378:metabolism; D012472:Salivation / Q000502:physiology; D055815:Young Adult
D000418:Albumins; C524578:MUC5B protein, human; C083238:MUC7 protein, human; D055257:Mucin-5B; D009077:Mucins; D012471:Salivary Proteins and Peptides; D000681:Amylases; D009113:Muramidase
Amylase; Anaerobic threshold; Mucins; Sympathetic stimulation