Nocturnal Plasma Melatonin Levels in Migraine: A Preliminary Report
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SYNOPSIS We determined by radioimmunoassay plasma melatonin levels on blood samples drawn at 11 p.m. in migraine patients and control subjects. Ninety‐three cephalalgic outpatients (75 females, 18 males) were compared to a control group (24 females, 22 males) matched according to age. Patients were divided into subgroups presenting common migraine (n = 38); ophthalmic migraine (n = 12); and tension headache associated with ophthalmic or common migraine (n = 24), and associated depressive status (n = 19). Statistical analysis revealed a decrease in plasma melatonin levels for the entire migraine population, compared to the control one, and a heterogeneity in both controls and patients; this heterogeneity was found mainly in the depressive and tension headache subgroups. When the migraine population‐from which the depressive patients were excluded‐was divided into male and female subgroups, a decrease in plasma melatonin levels was observed only for the female subgroups. Results are discussed with reference to the role of the pineal gland in the synchronization of the organism with the environmental conditions.Keywords:
Tension headache
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Pinealectomy
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Pinealocyte
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OBJECTIVES Pineal gland hormone, melatonin, is a current issue of interest for accumulating data concerning its diverse physiological functions. The disturbances in melatonin secretion are observed in different pathological conditions involving pineal regions, but it is not ascertained if those disturbances present any clinical implications. The aim of this work was to examine whether pineal gland compression changes melatonin secretion. SETTING AND DESIGN The experiment was carried out on adult rats, divided into four equal groups: (i) control (no surgery was performed), (ii) sham-operated, (iii) with sham pineal gland compression and (iv) with pineal gland compression performed by cotton piece application. METHODS The profile of melatonin secretion was assessed in blood samples collected five times daily, every second day, starting from 8 to 14 day following surgery. RESULTS We found that surgery itself significantly increased night melatonin secretion in comparison to controls. By contrast, in pineal-gland compressed rats, melatonin secretion was lower than in control group, suggesting that the influence of pineal compression overcame that induced by operation stress. CONCLUSIONS In conclusion, we presume that pineal gland compression (like in case of some tumors) results in decrease of the concentration of blood melatonin, that may possibly result in decreased protective action of the indoleamine.
Endocrine gland
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There is growing evidence that the pineal gland has antineoplastic properties which, however, can only partially be attributed to its hormone melatonin. While the in vivo tumor-inhibiting activity of melatonin is established, observations on its in vitro effects have been contradictory. The effect of this substance was investigated on six human cancer cell lines and compared to the activity of a partially purified, melatonin-free low molecular weight pineal extract (UM05R). Melatonin showed hardly any effect but UM05R was capable of inhibiting the growth of all the six cell lines tested. It is therefore concluded that a direct inhibiting action on tumor cells is not a general physiological role of melatonin as opposed to UM05R. It will be worthwhile to purify the yet unidentified pineal antitumor activity since it may have a considerable therapeutic potential.
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Pinealocyte
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Pinealocyte
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It has been known for many years that the pineal gland is involved in regulating tumor growth. In order to evaluate the functional activity of the pineal gland in neoplastic diseases, melatonin serum levels and its light/dark rhythm have been determined with the RIA method in patients affected by various forms of tumor. Irrespectively of the type of the tumor and of its localization, existence of two subpopulations has been observed within the oncologic patients, the former with normal levels of melatonin, and the latter with high ones. The light/dark rhythm of melatonin was anomalous in some cases. An evident decrease of serum melatonin values was seen after chemotherapy. It might be interesting to establish whether melatonin levels may conditionate the prognosis of patients with cancer.
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Melatonin (N-acetyl-5-methoxytryptamine) is a hormone produced by the pineal gland in the brain in response to darkness. Melatonin is made available when tryptophan is converted to serotonin and then enzymatically converted to melatonin in the pineal gland. Serum levels are low during the day, with peak levels occurring from 2-4 am.
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