Ontogeny of alpha-amylase circadian rhythms in rat parotid gland

Sanz, Elizabeth; Vermouth, Nelia T.; Bellavía, S. L.

doi:10.1016/0300-9629(86)90448-2

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…Both MDH activity and protein circadian rhythms have shown similar changes during testes ontogeny. Also, a comparable observation was reported by Sanz et al (1986) for rat parotid gland protein content and alpha-amylase activity.…”

Section: Discussionsupporting

confidence: 85%

“…In previous studies we had observed daily variations in the activity of certain enzymes like total lactate dehydrogenase and its isozyme C4 in rat testes and epididymis (Vermouth et al, 1984), and of alpha amylase in rat parotid gland (Vermouth et al, 1985;Sanz et al, 1986). Also, de las Heras and Calandra (1986) detected a circadian rhythm of ornithine decarboxylase activity in rat testis.…”

Section: Introductionmentioning

confidence: 90%

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Malate Dehydrogenase Activity of Rat Testis: Circadian Rhythm and its Ontogeny

Carriazo¹,

Ponce²,

Sereno³

et al. 1998

Biological Rhythm Research

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Malate dehydrogenase activity and soluble protein content in testes from rats exposed to a 14:00 h light:10:00 h dark photoperiod, have been determined every two or four hours over a 24 hour period in 5, 15, 25 and 120 day-old rats.By using the Cosinor method, the ontogeny of an unimodal rhythm was studied for MDH activity and soluble protein content in testis. In 5 and 15 day-old rats, the MDH acrophases were recorded around 19:00 h and 17:00 h, respectively. Rats aged 25 and 110 days showed the MDH acrophases during the dark period. An inversion of the MDH circadian rhythms was detected in 25 day-old compared to those of 5 and 15 day-old rats. An inversion of the protein circadian rhythm was also detected at 15 days compared to that at 5 days. These inversions persist in the adult rats. The amplitude of the MDH and protein rhythms reached the lowest value in adulthood. The mean daily value of testicular MDH increased between day 5 and 15, decreasing at day 35 and remaining unchanged until adulthood.The variation of malate dehydrogenase activity, soluble protein content levels, and the circadian rhythm parameters during the maturation process may be related to gonad development.

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Section: Discussionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 90%

Malate Dehydrogenase Activity of Rat Testis: Circadian Rhythm and its Ontogeny

Carriazo¹,

Ponce²,

Sereno³

et al. 1998

Biological Rhythm Research

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“…Protein synthesis and secretion are under sympathetic control (18,20); however a con-elation between these circadian rhythms and the neural activity of sympathetic efferents to the salivary glands, is not clear. 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).…”

Section: • Circadian Rhythms In Rat Salivary Glandsmentioning

confidence: 94%

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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