Effect of sympathetic denervation of the pineal gland on maternal co-ordination of the circadian rhythm of α-amylase in parotid gland from young rats

Bellavía, S. L.; Sanz, Elizabeth; Gallará, Raquel Vivian; Carpentieri, Ágata Rita; Vermouth, Nelia T.

doi:10.1016/0003-9969(93)90175-l

Cited by 4 publications

(2 citation statements)

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“…Circadian rhythms in total soluble proteins and a-amylase have also been described in the parotid gland of young rats (aged 15 and 25 days) (53,54). A clear temporal relationship between these rhythms and the activity of sympathetic nerves may be suggested, because 15-days old rats feed only on a liquid diet, while 25-days old animals eat solid food in approximately equal amounts throughout the 24 hours (54,55). Moreover, the a-amylase circadian rhythm of 25-days old rats is not affected when the animals are submitted to a 24 h fasting period, but it is suppressed by treatment with drugs which blocks norepinephrine synthesis, e.g.…”

Section: • Circadian Rhythms In Rat Salivary Glandsmentioning

confidence: 96%

“…There is a temporal inverse correlation between the a-amylase circadian rhythm and the neural activity of sympathetic efferents to the salivary glands. It was assumed that there may also be other factors which control the glandular secretory proteins content in addition to the diurnal changes in neural activity of sympathetic efferents to the glands (54,55). From a functional point view, the increment of amylase and total soluble proteins content in the rat salivary glands during the daily light phase may reflect a ho-meostatic mechanism responding to the increased requirements of saliva during the night period.…”

Section: • Circadian Rhythms In Rat Salivary Glandsmentioning

confidence: 99%

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Role for the sympathetic nervous system in the control of salivary secretion by environmental stimuli

Bellavía¹,

Gallar²

1998

Biomedical Reviews

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• Saliva plays an important role in most biologic events cciuring in the oral cavity and contributes to the mainte nance of systemic health. Secretion occurs in response to a salivary reflex. During the fasting period, mouth dryness con trols basal secretion. Chewing is the main stimulus for secre tion. In human, salivary secretion can be influenced by light/ darkness and other environmental stimuli. Postganglionic fibers originated in the superior cervical ganglia provide sympathetic innervation to salivary and pineal glands. Postsynaptic a-and j3-adrenoceptors mediate salivary re sponses, including synthesis, storage and release of proteins. In mammals, the suprachiasmatic nuclei generate and syn chronize endogenous circadian rhythms and the sympathetic nervous system plays an important role in the propagation of circadian signals. In immature rats, parotid a-amylase and total soluble protein circadian rhythms are controlled by periodic factors whose timing is independent of that imposed by nocturnal chewing of solid food. In rats exposed to various environmental stimuli, such as photoperiod, constant dark ness or light, the submandibular secretory response and fine structure of parotid gland, suggest'that both presence and absence of light can induce adrenergic responses. Homeostatic mechanisms would be required for a differential cow

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