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Varani K, Gessi S, Caiazza A, Rastelli G, Portaluppi F, Borea PA. Platelet alpha2-adrenoceptor alterations in patients with essential hypertension. Br J Clin Pharmacol 1999; 47:167-72. [PMID: 10190651 PMCID: PMC2014173 DOI: 10.1046/j.1365-2125.1999.00866.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AIMS The purpose of this study was to determine whether human platelet alpha2-adrenoceptors were altered in essential hypertension. A systematic analysis was carried out on 165 normotensives and 124 untreated primary hypertensives. METHODS The study was performed at different levels: i) density and affinity of platelet alpha2-adrenoceptors were determined by receptor binding assays using the full alpha2-adrenoceptor agonist [3H]-UK 14304 and a thermodynamic analysis of data was carried out to evaluate if binding mechanisms at the molecular level were altered during hypertension; ii) the functionality of Gi proteins coupled to alpha2-adrenoceptors and iii) forskolin-stimulated cAMP levels were measured. RESULTS Platelet alpha2-adrenoceptors mean density (Bmax) and affinity (Kd) (+/-s.e.mean) were significantly lower and higher, respectively, in normotensive than in hypertensive subjects [Bmax=327+/-4 vs 435+/-5 fmol mg(-1) of protein (P<0.01) and Kd=3.76+/-10.05 vs 6.50+/-0.15 nM (P<0.01), respectively]. The 50% stimulating concentration of adrenaline on [35S]-GTPgammaS binding to Gi proteins was significantly (P<0.01) lower in normotensives (12+/-2 nM) than in hypertensives (110+/-10 nM). The 50% inhibiting concentration of adrenaline on forskolin-stimulated cAMP levels was significantly (P<0.01) lower in normotensive (22+/-2 nM) than in hypertensive subjects (200+/-25 nM). CONCLUSIONS Present analysis, including receptorial and functional data, provides evidence that marked alterations occur in platelet alpha2-adrenoceptors of hypertensive subjects.
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Costantino L, Rastelli G, Vianello P, Cignarella G, Barlocco D. Diabetes complications and their potential prevention: aldose reductase inhibition and other approaches. Med Res Rev 1999; 19:3-23. [PMID: 9918192 DOI: 10.1002/(sici)1098-1128(199901)19:1<3::aid-med2>3.0.co;2-7] [Citation(s) in RCA: 136] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Despite recent advances both in the chemistry and molecular pharmacology of antidiabetic drugs, diabetes still remains a life-threatening disease, which tends to spread all over the world. The clinical profile of diabetic subjects is often worsened by the presence of several long-term complications, namely neuropathy, nephropathy, retinopathy, and cataract. Several attempts have been made to prevent or at least to delay them. The most relevant are reported in this review, including the development of compounds acting as aldose reductase inhibitors, anti-advanced glycation end-product drugs, free radical scavengers, vasoactive agents, essential fatty acid supplementation, and neurotropic growth factors.
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Cecconi I, Moroni M, Vilardo PG, Dal Monte M, Borella P, Rastelli G, Costantino L, Garland D, Carper D, Petrash JM, Del Corso A, Mura U. Oxidative modification of aldose reductase induced by copper ion. Factors and conditions affecting the process. Biochemistry 1998; 37:14167-74. [PMID: 9760253 DOI: 10.1021/bi981159f] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Bovine lens aldose reductase (ALR2) is inactivated by copper ion [Cu(II)] through an oxygen-independent oxidative modification process. A stoichiometry of 2 equiv of Cu(II)/enzyme mol is required to induce inactivation. While metal chelators such as EDTA or o-phenantroline prevent but do not reverse the ALR2 inactivation, DTT allows the enzyme activity to be rescued by inducing the recovery of the native enzyme form. The inactive enzyme form is characterized by the presence of 2 equiv of bound copper, at least one of which present as Cu(I), and by the presence of two lesser equivalents, with respect to the native enzyme, of reduced thiol residues. Data are presented which indicate that the Cu-induced protein modification responsible for the inactivation of ALR2 is the generation on the enzyme of an intramolecular disulfide bond. GSH significantly interferes with the Cu-dependent inactivation of ALR2 and induces, through its oxidation to GSSG, the generation of an enzyme form linked to a glutathionyl residue by a disulfide bond.
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Plessi M, Bertelli D, Rastelli G, Albasini A, Monzani A. Fruits of ribes, rubus, vaccinium and prunus genus. Metal contents and genome. ACTA ACUST UNITED AC 1998. [DOI: 10.1007/s002160050902] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Rastelli G, Costantino L. Molecular dynamics simulations of the structure of aldose reductase complexed with the inhibitor tolrestat. Bioorg Med Chem Lett 1998; 8:641-6. [PMID: 9871575 DOI: 10.1016/s0960-894x(98)00083-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
This study reports a molecular dynamics (MD) investigation on the structure of aldose reductase (ALR2) complexed with the potent inhibitor tolrestat. The simulations predict four different orientations of tolrestat into the ALR2 binding site; these orientations have in common a strong interaction of the anionic carboxylate with Tyr48, His110, Trp111 and NADP+, but completely differ for the orientation of the aromatic portion of the inhibitor. Interestingly, the orientation in which tolrestat gives the most attractive interaction energy with the enzyme is in full accord with the x-ray crystal structure of the complex that has been reported in the literature after this work was completed. In addition, the suggestion of more than one orientation of tolrestat during MD is in agreement with recent electrospray mass spectrometry experiments on the ALR2-tolrestat complex.
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31
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Costantino L, Rastelli G, Albasini A. Natural polyhydroxylated compounds as inhibitors of xanthine oxidase. DIE PHARMAZIE 1996; 51:994-5. [PMID: 8985991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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32
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Costantino L, Rastelli G, Vescovini K, Cignarella G, Vianello P, Del Corso A, Cappiello M, Mura U, Barlocco D. Synthesis, activity, and molecular modeling of a new series of tricyclic pyridazinones as selective aldose reductase inhibitors. J Med Chem 1996; 39:4396-405. [PMID: 8893834 DOI: 10.1021/jm960124f] [Citation(s) in RCA: 74] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Three new series of tricyclic pyridazinones have been synthesized and tested in vitro in order to assess (i) their ability to inhibit aldose reductase enzyme (ALR2) and (ii) their specificity toward the target enzyme with respect to other related oxidoreductases, such as aldehyde reductase, sorbitol dehydrogenase, and glutathione reductase. The inhibitory capability of the most effective compounds (IC50 values ranging from 6.44 to 12.6 microM) appears to be associated with a rather significant specificity for ALR2. Molecular mechanics and molecular dynamic calculations performed on the ALR2-inhibitor complex give indications of specific interaction sites responsible for the binding, thus providing information for the design of new inhibitors with improved affinity for the enzyme.
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33
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Ghelli S, Rastelli G, Barlocco D, Rinaldi M, Tondi D, Pecorari P, Costi MP. Conformational analysis of phthalein derivatives acting as thymidylate synthase inhibitors by means of 1H NMR and quantum chemical calculations. Bioorg Med Chem 1996; 4:1783-94. [PMID: 8931948 DOI: 10.1016/0968-0896(96)00193-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The conformations of a set of phthalein derivatives with bacterial thymidylate synthase (TS) inhibitory activity were investigated by 1H NMR spectra, performed at both room and low temperature, and by quantum chemical calculations. Since the crystal structure of the binary complex of phenolphthalein with the enzyme is known, we set out to study the conformation of various of its analogues in solution in order to observe the effects of the substituents on the phenolic rings, of the alpha-naphthol derivative and of the rigid analogue, fluorescein, and compare the results with the X-ray crystal structure studies. A relationship between the chemical shift of the proton on C4 (H4) of the phthalidic ring and the averaged angle formed by the phthalidic and the aromatic ring planes was found in which the most perpendicular conformations have the lowest H4 chemical shift values. At room temperature, the rotational freedom of all the studied compounds was similar, while at lower temperature the naphthol derivative assumed a partially blocked conformation. Finally, a qualitative relationship between the inhibitory properties of the compounds and their conformations is discussed.
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Vescovi PP, Rastelli G, Volpi R, Chiodera P, Di Gennaro C, Coiro V. Circadian variations in plasma ACTH, cortisol and beta-endorphin levels in normal-weight bulimic women. Neuropsychobiology 1996; 33:71-5. [PMID: 8927231 DOI: 10.1159/000119252] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
In order to establish possible alterations in the secretory patterns of adrenocorticotropic hormone (ACTH), cortisol and/or beta-endorphin in bulimia nervosa, the circadian fluctuations of these hormones were evaluated in blood samples taken at 1-hour intervals over 24 h. Eleven bulimic women with normal body weight and 8 weight- and age-matched normal controls were tested during the follicular phase (days 6-8) of normal menstrual cycles. All women were hospitalized for bulimia or for checkup examinations and were tested 3 days after hospital admission. Both normal and bulimic women showed maximal ACTH, cortisol and beta-endorphin levels at 08.00 h, with minimal ACTH and beta-endorphin levels at midnight and cortisol levels at 02.00 h. The general temporal structure of all hormonal secretions coincided in the two groups. However, whereas all measured ACTH/cortisol levels were quantitatively similar in the two groups, plasma beta-endorphin concentrations were significantly higher in bulimic than in control subjects at all examined time points. The enhancement in the overall 24-hour beta-endorphin secretion suggests the presence of an increased opioid tonus in bulimic women, which might play a role in the pathophysiology of the eating disorder.
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Costantino L, Rastelli G, Albasini A. Anthocyanidines as inhibitors of xanthine oxidase. DIE PHARMAZIE 1995; 50:573-4. [PMID: 7568325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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36
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Rastelli G, Costantino L, Albasini A. Theoretical and experimental study of flavones as inhibitors of xanthine oxidase. Eur J Med Chem 1995. [DOI: 10.1016/0223-5234(96)88219-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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37
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Casti A, Orlandini G, Troglio MG, Bacciottini F, Michelini M, Maninetti L, Vezzani G, Rastelli G, Vescovi P. Acute and chronic hyperbaric oxygen exposure in humans: effects on blood polyamines, adrenocorticotropin and beta-endorphin. ACTA ENDOCRINOLOGICA 1993; 129:436-41. [PMID: 8279224 DOI: 10.1530/acta.0.1290436] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Plasma beta-endorphin, adrenocorticotropin (ACTH) and blood polyamine (spermidine and spermine) concentrations were evaluated in healthy adult male athletes undergoing hyperbaric oxygen exposure for 10 days (2.8 atm, 100% O2, 60 min daily). In the "acute phase", corresponding to the first day of treatment, and in the "acute in the chronic phase", corresponding to the values obtained on the 5th and 10th days after 60 min of hyperbaric O2, both ACTH and beta-endorphin levels increased significantly, whereas no variations were observed for polyamine concentrations. In the "chronic phase", corresponding to the basal values of the 5th and 10th days of treatment, we found a different pattern. In fact, the concentration of polyamines showed a remarkable enhancement, while ACTH and beta-endorphin levels remained unchanged. No significant variations were observed during hyperbarism with air. These results demonstrate different modifications of polyamines and beta-endorphin and ACTH in subjects submitted to hyperbaric oxygen exposure.
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Rastelli G, Costantino L, Albasini A. Physico-chemical properties of anthocyanidins. Part 1. Theoretical evaluation of the stability of the neutral and anionic tautomeric forms. ACTA ACUST UNITED AC 1993. [DOI: 10.1016/0166-1280(93)90063-h] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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39
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Costantino L, Rastelli G, Albasini A. Inhibitory activity of flavonols towards the xanthine oxidase enzyme. Int J Pharm 1992. [DOI: 10.1016/0378-5173(92)90026-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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40
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Vezzani G, Vescovi PP, Solari G, Stefanini P, Rastelli G. [Neuroendocrine changes in subjects undergoing hyperbaric treatment]. Minerva Anestesiol 1991; 57:952-3. [PMID: 1660113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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41
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Ceda GP, Denti L, Ceresini G, Rastelli G, Dotti C, Cavalieri S, Valenti G, Hoffman AR. Calcitonin inhibition of growth hormone-releasing hormone-induced GH secretion in normal men. ACTA ENDOCRINOLOGICA 1989; 120:416-22. [PMID: 2541589 DOI: 10.1530/acta.0.1200416] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Calcitonin has been shown to modulate pituitary hormone secretion in a variety of ways. In this study we examined the effects of a salmon calcitonin infusion on GHRH-induced GH secretion in 5 normal men. In addition, in vitro experiments were performed using primary cultures of rat anterior pituitary cells in order to examine whether there is a direct pituitary effect of CT. Infusion of CT significantly blunted the GH response to GHRH in all subjects without affecting basal GH secretion or plasma calcium levels. Infusion of CT was accompanied by significant increases in ACTH, beta-endorphin, cortisol and free fatty acid levels, and by a significant decrease in serum insulin levels. The addition of CT to primary cultures of rat pituitary cells did not alter basal or stimulated secretion of GH or ACTH. These results indicate that: 1) CT blunts the GH response to GHRH; 2) CT infusion results in the stimulation of the hypothalamic-pituitary-adrenal axis, and 3) this effect is probably exerted at the hypothalamic level, since no direct activity of CT was documented in vitro on either GH or ACTH secretion.
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Rastelli G, Gerra G, Mineo F, Ceresini G, Baroni MC, Caccavari R, Delsignore R, Vescovi PP. [Homeostasis of blood glucose and abuse of exogenous opiates: evaluation of fructosamine and glycosylated hemoglobin]. Minerva Med 1987; 78:1291-6. [PMID: 3670683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The study was designed to assess glycaemic homeostasis in different situations of chronic stimulation of the opiate receptors by exogenous opiates. After an OGTT, levels of glycosylated haemoglobin (HbA1c) and serum fructosamine were measured in 3 groups of male drug addicts of comparable age. Group A consisted of 10 subjects undergoing substitution treatment with oral methadone. Group B consisted of 10 subjects addicted to intravenous injection of the syrup based methadone intended for oral administration. Group C consisted of 10 heroin addicts. Ten healthy subjects of the same age and sex were used as controls. Analysis of the results showed normal glucose tolerance in all groups with tendentially higher basal glycaemia levels in group B. HbA1c levels were significantly higher, though within normal limits, in group B than in either those receiving oral methadone (p less than 0.01) or the heroin addicts (p less than 0.01). The group B subjects also showed the highest fructosamine levels that were both well above normal limits and higher than those in the other groups in whom fructosamine levels were normal. The data therefore confirm normal glycaemia compensation in those taking oral methadone and in heroin addicts during the period considered. A new type of drug addiction involving the intravenous injection of methadone was also encountered. This produces an outstanding short-term change in glycaemic homeostasis and may well lead to future alterations in glucose tolerance.
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Ceresini G, Rastelli G, Ippolito L, Cipriani F, Gerra G, Vescovi PP. [Diabetes insipidus after selective pituitary adenomectomy. A case with late appearance]. Minerva Med 1987; 78:911-4. [PMID: 3601137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Diabetes insipidus is a well-known complication of hypophyseal surgery. The case is described of a women presenting with evident polyuropolydipsic syndrome arising 9 years after transphenoidal hypophyseal adenectomy. The diagnosis insipidus diabetes was secondary to intrasellar scars revealed by a hypophyseal CAT scan. The unusually long interval between surgery and the onset of the syndrome is emphasised.
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Gerra G, Ceresini G, Rastelli G, Butturini L, Vescovi PP. [Effect of diclofenac on the opiate withdrawal syndrome]. GIORNALE DI CLINICA MEDICA 1985; 66:459-65. [PMID: 3835090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Valenti G, Vescovi PP, Gerra G, Rastelli G, Butturini U. Activation of PRL secretion by combined treatment with cyproterone acetate and ethinylestradiol. J Endocrinol Invest 1985; 8:269-72. [PMID: 3161934 DOI: 10.1007/bf03348492] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Two groups of patients affected by idiopathic androgenization have been treated with ethinylestradiol (EE) associated with two different (high and low) dosages of cyproterone acetate (CA); the aim of this study was to evaluate the possible endocrine side effects at the pituitary level. After three and six months of treatment gonadotropins secretion appeared significantly inhibited with higher evidence for LH than for FSH and especially in the patients on high dose of CA. Nevertheless the most impressive finding was represented by the increase in PRL responses to TRH documented when higher doses of CA were employed without significant change in TSH secretion. The Authors suggest that such PRL hyperresponsiveness cannot be completely disregarded in the management of idiopathic androgenization.
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Rastelli G, Ceresini G, Gerra G, Vescovi PP. [Pseudohypoparathyroidism. A case complicated by reactive hypoglycemia]. RECENTI PROGRESSI IN MEDICINA 1985; 76:309-12. [PMID: 4059626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Vescovi PP, Gerra G, Rastelli G, Ceresini G, Moccia G. Pyridoxine (Vit. B6) decreases opioids-induced hyperprolactinemia. Horm Metab Res 1985; 17:46-7. [PMID: 3967846 DOI: 10.1055/s-2007-1013447] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Vescovi PP, Pezzarossa A, Ceresini G, Rastelli G, Valenti G, Gerra G. Effects of dopamine receptor stimulation on opiate-induced modifications of pituitary-gonadal function. HORMONE RESEARCH 1985; 21:155-9. [PMID: 3997064 DOI: 10.1159/000180040] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We evaluated the effects of the dopaminergic drug bromocriptine (Br) on prolactin (PRL), luteinizing hormone (LH) and testosterone (Te) levels in a homogeneous group of opiate addicts in a methadone maintenance program (20 mg twice daily). Basal blood levels of PRL, LH and Te were determined in 15 adult male drug addicts, before 30 and 60 days after Br administration (7.5 mg/day) was started. 15 healthy volunteers served as controls for the evaluation of basal values of the hormones. Before treatment PRL values were high, while LH and Te levels were lower than normal. 30 days later, PRL lowered significantly while LH and Te increased significantly. 60 days later, the blood hormone values were still significantly different from pretreatment values, and close to the normal range. This observation shows that Br, probably through an increase of dopaminergic tone, may counteract some effects of opiates on the hypothalamic-pituitary-gonadal axis.
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Vescovi PP, Gerra G, Rastelli G, Ceda GP, Valenti G. Effect of methadone on TSH and thyroid hormone secretion. Horm Metab Res 1984; 16:53-4. [PMID: 6698493 DOI: 10.1055/s-2007-1014693] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The hypothalamus-pituitary-thyroid function was studied in 15 male patients on chronic methadone treatment (40 mg/day). No significant variations of TSH, T4, T3 and rT3 levels were documented, either in basal conditions or after TRH stimulation; however a reduced TSH pituitary response was recorded in some patients (6 out of 15).
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Rastelli G, Kirklin JW, Kincaid OW. Angiocardiography of persistent common atrioventricular canal. Mayo Clin Proc 1967; 42:200-9. [PMID: 6021842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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