Abstract:
:Melatonin and somatostatin are known to exert similar effects on locomotor activity. We have previously demonstrated that acute melatonin treatment regulates somatostatin receptor function in the rat frontoparietal cortex. However, the effects of subchronic and chronic melatonin treatment on the somatostatin receptor-G protein-adenylyl cyclase system in the rat frontoparietal cortex are unknown. Melatonin was administered subcutaneously at a daily dose of 25 microg/kg for 4 days, 1 wk or 2 wk. Twenty-four hours after the last injection, the animals were sacrificed. Melatonin did not alter the somatostatin-like immunoreactivity content in the frontoparietal cortex from control and melatonin-treated rats during any of the previously indicated periods. Four days of melatonin administration induced both an increase in the number of [(125)I]-Tyr11-somatostatin receptors and a decrease in the affinity of somatostatin for its receptors in frontoparietal cortical membranes. The increased number of somatostatin receptors in the melatonin-treated rats was associated with an increased capacity of somatostatin to inhibit basal and forskolin-stimulated adenylyl cyclase activity. Melatonin administration for 4 days induced a higher adenylyl cyclase activity both under basal conditions and after direct stimulation of the enzyme with forskolin. No significant differences were observed in the function of Gi proteins in the 4-day melatonin-treated rats. Western blot analyses showed that the 4-day melatonin treatment reduced Gialpha(2) levels, without altering the amount of Gialpha(1). These melatonin-induced changes reverted to control values after 7 or 14 days of treatment. Altogether, the present findings suggest that subchronic melatonin treatment modulates the somatostatin receptor/effector system in the rat frontoparietal cortex.
journal_name
J Pineal Resjournal_title
Journal of pineal researchauthors
Izquierdo-Claros RM,Boyano-Adánez Mdel C,Arilla-Ferreiro Edoi
10.1034/j.1600-079x.2002.02906.xsubject
Has Abstractpub_date
2002-11-01 00:00:00pages
189-97issue
4eissn
0742-3098issn
1600-079Xpii
2o906journal_volume
33pub_type
杂志文章abstract::The effects of noradrenergic and cholinergic receptor agonists on intracellular Ca2+ concentration ([Ca2+]i) in single dissociated rat pineal cells were investigated by microfluorimetric measurements in Fura-2 acetoxymethyl ester (Fura-2/AM) loaded cells. Noradrenaline (NA) evoked characteristic biphasic increments of...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079x.1996.tb00266.x
更新日期:1996-08-01 00:00:00
abstract::In this study, the effect of melatonin on sodium arsenite (arsenite)-induced peripheral neurotoxicity was investigated using dorsal root ganglion (DRG) explants. After 24-hr incubation, arsenite (30 microm) consistently elevated the expression of heat shock protein 70 and haeme oxygenase-1, two well-known stress prote...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079X.2008.00629.x
更新日期:2009-01-01 00:00:00
abstract::Adult female golden hamsters were used to study the effect of short photoperiod on the endogenous opioid system and the effect of pinealectomy on the serum beta-endorphin-like immunoreactivity (beta-end LI) levels. Hamsters were housed under either long photoperiod (14L:10D) or short photoperiod (2L:22D) and the regul...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079x.1984.tb00211.x
更新日期:1984-01-01 00:00:00
abstract::As for many hormones, melatonin levels in the blood suggest that it is discharged from the pineal gland in a pulsatile manner. Recently, the existence of short-term episodes, superimposed on the circadian pattern of circulating melatonin, has been questioned. Because plasma melatonin levels reflect not only the secret...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079x.1995.tb00151.x
更新日期:1995-04-01 00:00:00
abstract::Day and nighttime melatonin production in the pineal gland was compared in normal and cardiomyopathic (polydystrophic) adult male Syrian hamsters. These strains of hamsters were selected for comparison because the cardiomyopathetic hamster displays a deficient transmembrane Ca(2+)-pump in a number of tissues, and intr...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079x.1991.tb00472.x
更新日期:1991-10-01 00:00:00
abstract::This study aimed to elucidate whether melatonin would exert beneficial effects on the neuronal functions of the nodose ganglion (NG) following acute hypoxic insult. The cytochrome oxidase (COX) and the nicotinamine adenine dinucleotide phosphate diaphorase (NADPH-d) histochemistry along with the nitric oxide synthase ...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079X.2005.00238.x
更新日期:2005-09-01 00:00:00
abstract::Melatonin was tested in an ongoing attempt to find the endogenous antagonists of quinolinic acid, an endogenous convulsant. Among a great number of metabolites that have been tried before, only a few were found (cerulein and quinaldic acid in mice and kynurenic acid in rats). In SHR (bred from Swiss) male mice, intrac...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079x.1998.tb00535.x
更新日期:1998-05-01 00:00:00
abstract::Previous data have demonstrated that a single 1-hr light pulse at night affects the secretion of melatonin in the ram if it was given at the appropriate time. This paper reports the effect on melatonin secretion of a 1-hr light pulse given at two different times at night to two groups of rams kept in constant darkness...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079x.1996.tb00289.x
更新日期:1996-11-01 00:00:00
abstract::The production of oxygen free radicals has been strongly implicated as an important pathophysiological mechanism mediating myocardial ischemia/reperfusion (I/R) injury. Various antioxidants have cardioprotective effects. Melatonin, an indoleamine synthesized by the pineal gland, is a potent antioxidant and a direct fr...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1034/j.1600-079x.2002.01869.x
更新日期:2002-09-01 00:00:00
abstract::Hypochlorous acid (HOCl) is a potent cytotoxic oxidant generated by the enzyme myeloperoxidase (MPO) in the presence of hydrogen peroxide (H2 O2 ) and chloride (Cl- ). Elevated levels of HOCl play an important role in various pathological conditions through oxidative modification of several biomolecules. Recently, we ...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/jpi.12463
更新日期:2018-04-01 00:00:00
abstract::Abnormal proliferation and motility of retinal pigment epithelial cells leads to proliferative vitreoretinopathy (PVR). Melatonin is a known effective antitumour and anti-invasive agent, but whether it affects the formation and underlying mechanisms of PVR remains unclear. In this study, the results of the MTT assay, ...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/jpi.12615
更新日期:2020-01-01 00:00:00
abstract::Classical anticancer therapies often are ineffective in patients with malignant glioma who have a survival of <1 year. Our previous studies showed a potent inhibitory effect of melatonin on glioma cell proliferation. This effect seems to be mediated by the well-known antioxidant properties of this molecule and the neg...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079X.2007.00468.x
更新日期:2007-10-01 00:00:00
abstract::Irradiation of the melatonin metabolite N(1)-acetyl-N(2)-formyl-5-methoxykynuramine (AFMK) with UV light of 254 nm causes the release of carbon monoxide (CO) and, thus, deformylation to N(1)-acetyl-5-methoxykynuramine (AMK). Liberation of CO was demonstrated by reduction of PdCl(2) to metallic palladium, under avoidan...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079X.2007.00550.x
更新日期:2008-05-01 00:00:00
abstract::The effect of various cations on activity of hydroxyindole-O-methyltransferase (HIOMT) and N-acetyltransferase (NAT) from pineal gland was studied. Copper inhibited both enzymes while calcium and magnesium inhibited HIOMT; the mechanisms of these inhibitions are unknown at this stage. Calcium, magnesium, potassium, an...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079x.1987.tb00852.x
更新日期:1987-01-01 00:00:00
abstract::Exposure of rats to light during darkness or blockade of the pineal beta-adrenoceptor in stimulated pineal glands results in a rapid fall in pineal N-acetyltransferase (NAT) activity. Maintenance of a high level of NAT activity requires continuous stimulation of the pineal beta-adrenoceptors. It is not known what fact...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079x.1992.tb00026.x
更新日期:1992-03-01 00:00:00
abstract::Melatonin has been proposed as a possible treatment for the deleterious effects of hypoxia/reoxygenation (H/R), such as autophagy, inflammation, and apoptosis. Pathological pregnancies, such as preeclampsia, are associated with placental H/R, and decreased placental melatonin synthesis as well as lower melatonin level...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/jpi.12520
更新日期:2018-11-01 00:00:00
abstract::Solid data support the idea that the MT(3) melatonin binding site is an enzyme, quinone reductase 2 (NQO2), rather than a membrane melatonin receptor. However, the melatonin analogue, 5-methoxycarbonylamino-N-acetyltryptamine (5-MCA-NAT), reduces intraocular pressure (IOP) via MT(3) melatonin receptors. Therefore, the...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079X.2009.00702.x
更新日期:2009-09-01 00:00:00
abstract::Melatonin, a potent antioxidant, has shown to be beneficial in murine Venezuelan equine encephalomyelitis (VEE) virus infection. In addition, melatonin can induces the production of interleukin-1 beta (IL-1beta), a cytokine capable of inducing increased expression of inducible nitric oxide synthase; the activity of th...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079X.2006.00381.x
更新日期:2007-03-01 00:00:00
abstract::Seasonal day length has been linked to the prevalence of mood disorders, and however, the mechanisms underlying this relationship remain unknown. Previous work in our laboratory has shown that developmental exposure to seasonal photoperiods has enduring effects on the activity of mouse dorsal raphe serotonergic neuron...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/jpi.12705
更新日期:2020-11-19 00:00:00
abstract::Recently, a species-dependent distribution of melatonin binding sites have been found in lamina I-V and lamina X of the spinal cord. In order to learn more about the function of spinal melatonin receptors, we investigated (i) the gene expression for melatonin receptor subtypes in lumbar and thoracal spinal cord tissue...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1034/j.1600-079x.2003.00047.x
更新日期:2003-08-01 00:00:00
abstract::No previous reports have described the effects of an increase in endogenous melatonin levels on plant yield and reproduction. Here, the phenotypes of melatonin-rich transgenic rice plants overexpressing sheep serotonin N-acetyltransferase were investigated under field conditions. Early seedling growth of melatonin-ric...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/jpi.12129
更新日期:2014-05-01 00:00:00
abstract::Melatonin is an excellent free radical scavenger, reacting with tert-butoxyl and cumyloxyl radicals with rate constants of 3.4 x 10(7) and 6.7 x 10(7) M-1s-1, respectively. Reaction with benzophenone triplet occurs with a near-diffusion-controlled rate constant of 7.6 x 10(9) M-1s-1 in acetonitrile and probably involv...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079x.1995.tb00188.x
更新日期:1995-11-01 00:00:00
abstract::The pineal hormone melatonin, due to its lipophilic nature, has access to every cell and every part of a cell in the body, suggesting that it could exert effects on blood immune cells. The regulation of the activation of monocytes may be important in a number of diseases, especially pathophysiological conditions assoc...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079x.1999.tb00566.x
更新日期:1999-01-01 00:00:00
abstract::The aim of this study was to determine, in the rat, the interaction between melatonin and cholecystokinin in the regulation of the ileal interdigestive motility. This was analyzed by the chronic electromyography technique. Ileal motility was defined by the presence of intermittent spike bursts corresponding to the con...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079x.1994.tb00117.x
更新日期:1994-09-01 00:00:00
abstract::Constitutive activation and gemcitabine induction of nuclear factor-κB (NF-κB) contribute to the aggressive behavior and chemotherapeutic resistance of pancreatic ductal adenocarcinoma (PDAC). Thus, targeting the NF-κB pathway has proven an insurmountable challenge for PDAC therapy. In this study, we investigated whet...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/jpi.12285
更新日期:2016-01-01 00:00:00
abstract::We tested the hypothesis that melatonin (Mel) enhances exogenous mitochondria (Mito) treatment against rodent hepatic ischemia-reperfusion (IR) injury. In vitro study utilized three groups of hepatocytes (i.e. nontreatment, menadione, and menadione-melatonin treatment, 4.0 × 10(5) each), while in vivo study used adult...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/jpi.12326
更新日期:2016-08-01 00:00:00
abstract::Melatonin is a very potent and efficient endogenous radical scavenger. The pineal indolamine reacts with the highly toxic hydroxyl radical and provides on-site protection against oxidative damage to biomolecules within every cellular compartment. Melatonin acts as a primary non-enzymatic antioxidative defense against ...
journal_title:Journal of pineal research
pub_type: 杂志文章,评审
doi:10.1111/j.1600-079x.1993.tb00498.x
更新日期:1993-05-01 00:00:00
abstract::5-Methoxycarbonylamino-N-acetyltryptamine (MCA-NAT) has been initially described as a ligand at non MT(1), non MT(2) melatonin binding site (MT3) selective versus MT(1) and MT(2), two membrane melatonin receptors. MCA-NAT activity has been reported by others in different models, in vivo, particularly in the intra-ocul...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079X.2010.00746.x
更新日期:2010-04-01 00:00:00
abstract::Elevated levels of soluble cellular adhesion molecules have been reported in patients with acute coronary syndromes. Likewise, a relation between decreased nocturnal melatonin levels and coronary artery disease has been suggested. The aim of the present study was to investigate the day-night variations in the concentr...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079X.2007.00529.x
更新日期:2008-01-01 00:00:00
abstract::The circadian system comprises several peripheral oscillators and a central rhythm generator that, in mammals, is located in the suprachiasmatic nucleus of the hypothalamus. Expression of clock genes is a characteristic feature of the central rhythm generator and the peripheral oscillators. With regard to the rhythmic...
journal_title:Journal of pineal research
pub_type: 杂志文章
doi:10.1111/j.1600-079X.2005.00279.x
更新日期:2006-01-01 00:00:00