F X Sureda

Universitat Rovira i Virgili, Tarraco, Catalonia, Spain

Are you F X Sureda?

Claim your profile

Publications (39)101.97 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: The present study had focused on the behavioral phenotype and gene expression profile of molecules related to insulin receptor signaling in the hippocampus of 3 and 6months-old APPswe/PS1dE9 (APP/PS1) transgenic mouse model of Alzheimer's disease (AD). Elevated levels of the insoluble Aβ (1-42) were detected in the brain extracts of the transgenic animals as early as 3months of age, prior to the Aβ plaque formation (pre-plaque stage). By the early plaque stage (6months) both the soluble and insoluble Aβ (1-40) and Aβ (1-42) peptides were detectable. We studied the expression of genes related to memory function (Arc, Fos), insulin signaling, including Insulin receptor (Insr), Irs1 and Irs2, as well as genes involved in insulin growth factor pathways, such as Igf1, Igf2, Igfr and Igfbp2. We also examined the expression and protein levels of key molecules related to energy metabolism (PGC1-α, and AMPK) and mitochondrial functionality (OXPHOS, TFAM, NRF1 and NRF2). 6months-old APP/PS1 mice demonstrated impaired cognitive ability, were glucose intolerant and showed a significant reduction in hippocampal Insr and Irs2 transcripts. Further observations also suggest alterations in key cellular energy sensors that regulate the activities of a number of metabolic enzymes through phosphorylation, such as a decrease in the Prkaa2 mRNA levels and in the pAMPK (Thr172)/Total APMK ratio. Moreover, mRNA and protein analysis reveals a significant downregulation of genes essential for mitochondrial replication and respiratory function, including PGC-1α in hippocampal extracts of APP/PS1 mice, compared to age-matched wild-type controls at 3 and 6months of age. Overall, the findings of this study show early alterations in genes involved in insulin and energy metabolism pathways in an APP/PS1 model of AD. These changes affect the activity of key molecules like NRF1 and PGC-1α, which are involved in mitochondrial biogenesis. Our results reinforce the hypothesis that the impairments in both insulin signaling and energy metabolism precede the development of AD amyloidogenesis.
    Biochimica et biophysica acta. 05/2014;
  • Biochimica et Biophysica Acta (BBA) - Molecular Basis of Disease 01/2014; · 4.91 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The more common sporadic form of Alzheimer disease (SAD) and metabolic syndrome are two highly prevalent pathological conditions of Western society due to incorrect diet, lifestyle, and vascular risk factors. Due to the increasing aging of populations, prevalence of AD in western industrialized countries will rise in the near future and, thus, new knowledge in the area of molecular biology and epigenetics will probably help to reverse the neurodegenerative process. Recent data have suggested metabolic syndrome as an independent risk factor for SAD. Furthermore, biological plausibility for this relationship has been framed within the metabolic cognitive syndrome concept, and some authors designed SAD as a brain diabetes or diabetes 3. Then, impaired signaling of insulin and from some adipokines involved in the so called adipoinsular axis, like leptin, ghrelin or amylin could give a metabolic basis to explain the origin and progression of SAD. Thus, dipokines like leptin, ghrelin and amylin, or their mimetic compounds, could contribuite to inhibit apoptosis and inflammation processes and, thus, generate protective responses in the nervous system. Moreover, these adipokines might promote the activation of a cognitive process which may retard or even partially reverse selected aspects of Alzheimer's disease or ageing memory loss.
    Current pharmaceutical design 03/2013; · 4.41 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Leptin (Lep), an adipose-derived hormone, exerts very important functions in the body mainly on energy storage and availability. The physiological effects of Lep controlling the body weight and suppressing appetite are mediated by the long form of Lep receptor in the hypothalamus. Lep receptor activates several downstream molecules involved in key pathways related to cell survival such as STAT3, PI3K, MAPK, AMPK, CDK5 and GSK3β. Collectively, these pathways act in a coordinated manner and form a network that is fully involved in Lep physiological response. Although the major interest in Lep is related to its role in the regulation of energy balance, and since resistance to Lep affects is the primary risk factor for obesity, the interest on their effects on brain cognition and neuroprotection is increasing. Thus, Lep and Lep mimetic compounds now await and deserve systematic exploration as the orchestrator of protective responses in the nervous system. Moreover, Lep might promote the activation of a cognitive process that may retard or even partially reverse selected aspects of Alzheimer's disease or ageing memory loss.
    Journal of Molecular Endocrinology 09/2012; 49(3):R149-R156. · 3.58 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Resveratrol prolongs lifespan and prevent cancer formation; however, the mechanisms are not understood. Here we evaluated the cell-cycle inhibition and apoptosis of resveratrol in B65 neuroblastoma cells, and we also studied the effects of resveratrol on the mammalian silent information regulator 2 (SIRT1). Results show that resveratrol reduces cell viability and causes apoptosis at 24 h of treatment. Resveratrol partially blocked cell proliferation, and significantly increased the fraction of cells arrested in the S phase. The role of SIRT1 in cell-cycle effects mediated by resveratrol was studied through changes in the expression of SIRT1 using western blot. Exposure to resveratrol decreased SIRT1 content, concomitant with an increase in the acetylated form of sirtuin substrates p53 and NFκ-β. Treatment of B65 neuroblastoma cells with resveratrol also reduced the content of the phosphorylated form of AKT. Exposure to the SIRT1 inhibitors nicotinamide and sirtinol altered neither cell viability nor the fraction of apoptotic cells. Furthermore, when cells were exposed simultaneously to resveratrol and nicotinamide or sirtinol, no changes were observed in the fraction of apoptotic cells. Our results show that a decrease in SIRT1 content, caused by exposure to resveratrol, does not appear to be involved in cell-cycle arrest or activation of apoptosis.
    Neurochemical Research 10/2010; 36(2):187-94. · 2.13 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We examined the expression of SIRT1 in several experimental paradigms of human pathologies. We used a neuroblastoma cell line (B65), neuronal primary cultures (hippocampus and cerebellar granule cells) and in vivo approaches in rat and senescence murine models (SAM). Cell cultures and rats were treated with several well-know neurotoxins, i.e. rotenone, MPP(+), kainate and 3-nitropropionic acid. Subsequently, SIRT1 expression was compared in these different paradigms of neurotoxicity. The pattern of expression of SIRT1 in proliferating cell cultures (B65) was different to that in quiescent cell cultures. In the murine model of senescence (senescence-accelerated mice prone, SAMP8), SIRT1 expression progressively decreased, while in the control strain (senescence-accelerated mice resistant, SAMR1) it increased. Finally, we studied human samples of Parkinson's disease (PD), dementia with Lewy bodies (DLB) and Huntington's diseases (HD). SIRT1 expression decreased dramatically in HD, but there were no significant changes in Parkinson-related illnesses. In conclusion, SIRT1 expression may be a good sensor of toxic neuronal processes.
    Neuroscience 08/2008; 154(4):1388-97. · 3.12 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The mitochondrial peripheral benzodiazepine receptor (PBR) is involved in a functional structure designated as the mitochondrial permeability transition (MPT) pore, which controls apoptosis. PBR expression in nervous system has been reported in glial and immune cells. We now show expression of both PBR mRNA and protein, and the appearance of binding of a synthetic ligand fluo-FGIN-1-27 in mitochondria of rat cerebellar granule cells (CGCs). Additionally, the effect of PBR ligands on colchicine-induced apoptosis was investigated. Colchicine-induced neurotoxicity in CGCs was measured at 24 h. We show that, in vitro, PBR ligands 1-(2-chlorophenyl-N-methylpropyl)-3-isoquinolinecarboxamide (PK11195), 7-chloro-5-(4-chlorophenyl)-1,3-dihydro-1-methyl-2H-1,4- benzodiazepin-2-one (Ro5-4864) and diazepam (25- 50 microM) enhanced apoptosis induced by colchicine, as demonstrated by viability experiments, flow cytometry and nuclear chromatin condensation. Enhancement of colchicine-induced apoptosis was characterized by an increase in mitochondrial release of cytochrome c and AIF proteins and an enhanced activation of caspase-3, suggesting mitochondrion dependent mechanism that is involved in apoptotic process. Our results indicate that exposure of neural cells to PBR ligands generates an amplification of apoptotic process induced by colchicine and that the MPT pore may be involved in this process.
    APOPTOSIS 02/2005; 10(1):91-104. · 3.95 Impact Factor
  • 12/2004: pages 211-217;
  • [Show abstract] [Hide abstract]
    ABSTRACT: The mechanisms underlying selective neuronal cell death in kainic acid-mediated neurodegeneration are not fully understood. We have recently demonstrated that in cerebellar granule neurons, kainic acid induces the expression of proteins associated with cell-cycle progression. In the present study we show that 3-amino thioacridone (3-ATA), a selective cyclin-dependent kinase 4 inhibitor, attenuates kainic acid-induced apoptosis in cerebellar granule neurons. When neurons were pre-treated with 3-ATA 10 microM for 24 h, they were less susceptible to damage induced by kainic acid 500 microM, since the number of dead cells decreased significantly. In flow cytometry studies using propidium iodide staining, 3-ATA also reduced the ratio of apoptotic cells induced by kainic acid. Moreover, 3-ATA decreased the proportion of cells with a condensed nucleus from 55% to 22%. Our data suggest that the cell cycle pathway is involved in the mechanism of apoptosis mediated by kainic acid and that cyclin-dependent kinase 4 plays a prominent role in this process. 3-ATA may to prevent the apoptosis associated with neurodegenerative disorders without the over-activation of excitatory amino acid receptors.
    Neuroscience 02/2003; 120(3):599-603. · 3.12 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The following parameters related to oxygen free radicals (OFR) were determined in erythrocytes and the epidermis of hairless rats: catalase (CAT), glutathione peroxidase (GPx), glutathione reductase (GR), reduced (GSH) and oxidized (GSSG) glutathione, glutathione S-transferase (GST), superoxide dismutase (SOD) and thiobarbituric acid reactive substances (TBARS). GSH, GSSG and TBARS were also analyzed in plasma. In erythrocytes, the Pearson correlation coefficients (r) were significant (p < 0.001) between glutathione and other parameters as follows: GSH correlated negatively with GSSG (r = -0.665) and TBARS (r = -0.669); GSSG correlated positively with SOD (r = 0.709) and TBARS (r = 0.752). Plasma GSSG correlated negatively with erythrocytic thermostable GST activity (r = -0.608; p=0.001) and with erythrocytic total GST activity (r = -0.677; p < 0.001). In epidermis (p < 0.001 in all cases), GSH content correlated with GSSG (r = 0.682) and with GPx (r = 0.663); GSSG correlated with GPx (r = 0.731) and with GR (r = 0.794). By multiple linear regression analysis some predictor variables (R(2)) were found: in erythrocytes, thermostable GST was predicted by total GST activity and GSSG, GSSG content was predicted by GSH and by the GSH/GSSG ratio and GPx activity was predicted by GST, CAT and SOD activities; in epidermis, GSSG was predicted by GR and SOD activities and GR was predicted by GSSG, TBARS and GPx. It is concluded that the hairless rat is a good model for studying OFR-related parameters simultaneously in blood and skin, and that it may provide valuable information about other animals under oxidative stress.
    Life Sciences 08/2002; 71(15):1739-49. · 2.56 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We tested the potential cytoprotective role of C-phycocyanin in rat cerebellar granule cell cultures. Cell death was induced by potassium and serum (K/S) withdrawal. Cell viability was studied using the neutral red assay and laser scanning cytometry with propidium iodide as fluorochrome. C-phycocyanin (1-3 mg/ml) showed a neuroprotective effect against 24 h of K/S deprivation in cerebellar granule cells. After 4 h K/S deprivation this compound (3 mg/ml) inhibited formation of reactive oxygen species, measured as 2',7'-dichlorofluorescein fluorescence, showing its scavenger capability. Pre-treatment with C-phycocyanin reduced thymidine incorporation into DNA below control values and reduced dramatically apoptotic bodies as visualized by propidium iodide, indicating inhibition of apoptosis induced by K/S deprivation. Flow cytometry studies, using propidium iodide in TritonX100 permeabilized cells, indicated that 24 h K/S deprivation acts as a proliferative signal for cerebellar granule cells, which show an increase in S-phase percentage and cells progressed into the apoptotic pathway. C-phycocyanin protected cerebellar granule cells from the apoptosis induced by deprivation. These results suggest that C-phycocyanin prevents apoptosis in cerebellar granule cells probably through the antioxidant activity. It is proposed that K/S deprivation-induced apoptosis could be due, in part, to an alteration in the cell cycle mediated by an oxidative stress mechanism.
    Archiv für Experimentelle Pathologie und Pharmakologie 09/2001; 364(2):96-104. · 2.15 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: 1. Previous studies indicate that 3-nitropropionic acid (3-NPA) neurotoxicity involves the excitotoxic activation of N-methyl-D-aspartate (NMDA) receptors. Thus, we examined the effect of orphenadrine (an anticholinergic drug with NMDA receptor antagonist properties) on 3-NPA neurotoxicity in both cultured rat cerebellar granule cells (CGCs) and in rats. 2. Orphenadrine protected CGCs from 3-NPA-induced mortality, as assessed by both the neutral red viability assay and laser scanning cytometry, using propidium iodide staining. 3. For rats, two indirect markers of neuronal damage were used: the binding of [(3)H]-PK 11195 to the peripheral-type benzodiazepine receptor (PBR), a microglial marker, and expression of the 27 kD heat-shock protein (HSP27), a marker of activated astroglia. Systemic administration of 3-NPA (30 mg kg(-1) per day for 3 days) induced a 170% increase in [(3)H]-PK 11195 binding, and expression of HSP27. 4. Both the increase in [(3)H]-PK 11195 and HSP 27 expression were prevented by previous administration of 30 mg kg(-1) per day of orphenadrine for 3 days. Lower doses (10 and 20 mg kg(-1)) had no protective effect. Orphenadrine also reduced 3-NPA-induced mortality in a dose-dependent manner. 5. We propose that orphenadrine or orphenadrine-like drugs could be used to treat neurodegenerative disorders mediated by overactivation of NMDA receptors.
    British Journal of Pharmacology 03/2001; 132(3):693-702. · 5.07 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The effects of nitric oxide synthase (NOS) inhibitors, N(omega)-nitro-L-arginine and 7-nitroindazole, and the NOS substrate L-arginine on kainic acid (KA)-induced microglial reactivity and stress response were studied in the hippocampus 7 and 1 days after KA, respectively. Density of peripheral-type benzodiazepine receptors was measured as an index of microglial reactivity. Histological damage in hippocampus was evaluated at 7 days by neuronal counting. KA increased the maximal number of binding sites (B(max)) versus controls. Administration of either 7-nitroindazole (25 mg/kg) or N(omega)-nitro-L-arginine (20 and 50 mg/kg) 24 hr before KA, further increased B(max). This later effect was abolished by L-arginine (1 g/kg), which given 24 hr before KA decreased B(max) to control values. Also, KA-induced HSP72 stress response was attenuated by pre-treatment with L-arginine. Histological evaluation showed reduced cell numbers in the pyramidal cell layer of the hippocampus in groups receiving KA, either alone or in combination with 7-nitroindazole. Administration of L-arginine before KA attenuated neuronal loss in CA3 but not CA1. A clear protective effect was observed, however, in CA1 and CA3, in rats receiving both L-arginine plus 7-nitroindazole before KA. The results show that the combination of a NO substrate with a NOS inhibitor reduces the neurotoxic effects of KA in the rat hippocampus. This study suggests that extremely fine regulation of NO levels in the different neural cell types can modulate excitotoxicity.
    Journal of Neuroscience Research 04/2000; 59(6):797-805. · 2.97 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The overexcitation of glutamate receptors is believed to be the cause of several neurodegenerative disorders. The determination of calcium fluxes, mitochondrial membrane potential (MMP) variations or the production of reactive oxygen species (ROS) in mammalian cells are usually measured during the development of potentially useful drugs that might interfere in the events induced by glutamate receptor activation. By using flow cytometry with dissociated cerebellar granule cells, we have developed a rapid and economical method to measure changes in biochemical parameters that are involved in neuronal cell death. The formation of intracellular ROS is measured using 2',7'-dichlorofluorescin diacetate (DCFH-DA). The mitochondrial membrane potential is assessed by the retention of rhodamine 123 (Rh123), a specific fluorescent cationic dye that is readily sequestered by active mitochondria, depending on their transmembrane potential. Finally, intracellular calcium increases are detected by using the calcium-selective indicator Indo-1. Cell viability is also assessed by using propidium iodide (PI) which stains DNA strands of permeabilized cells. This method might be useful for the screening of new drugs with potential neuroprotective activity, with improved cost/effectiveness ratio compared to other techniques.
    Brain Research Protocols 01/2000; 4(3):280-7. · 1.82 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The anticholinergic drug orphenadrine is used in the treatment of Parkinson's disease. In this study we evaluate the neuroprotective effects of orphenadrine on excitotoxicity in vivo and in vitro. Orphenadrine prevented the mitochondrial and the cytoplasmic membrane potential decrease evoked by NMDA (100 microM) in rat dissociated cerebellar granule cells showing an IC50 value of 11.6 +/- 4.7 microM (mean +/- SEM, n = 5) and 13.5 +/- 2.3 microM (n = 3), respectively. Orphenadrine was able to protect cerebellar granule cell cultures from glutamate-induced neurotoxicity. Kainic acid (KA, 10 mg/kg)-induced excitotoxicity was evaluated in vivo using the microglial marker peripheral-type benzodiazepine receptor (PBR) and heat shock protein 72 (HSP72) expression in the hippocampus. The Bmax of PBR for control tissues was 589.1 +/- 40.0 fmol/mg protein (n = 4), increasing to 1692.5 +/- 51.6 fmol/mg protein (n = 5) after the KA treatment. Pretreatment with orphenadrine (10 mg/kg) blocked the KA-induced increase in PBR density. As expected, KA-administration induced the expression of HSP72 that was blocked in the orphenadrine + KA-treated rats. We demonstrate that orphenadrine, interacting at the NMDA receptor, is able to prevent the neurotoxicity mediated by activation at glutamate ionotropic receptors.
    Neuropharmacology 06/1999; 38(5):671-7. · 4.11 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The effects of the lazaroid compound U-83836E on the glutamate-induced production of reactive oxygen species (ROS) were studied in dissociated rat cerebellar granule cells by flow cytometry. U-83836E completely inhibited ROS production with an estimated IC50 value of 21.7 +/- 9.1 nM. However, U-83836E did not inhibit the glutamate-evoked decrease in mitochondrial membrane potential (MMP). Nevertheless, U-83836E (10 nM to 10 microM) prevented cell death induced by 10 mM of glutamate. At concentrations above 10 microM, U-83836E by itself showed slight cytotoxicity, which was significant at a 100 microM concentration. U-83836E (25 to 200 microM) also increased the cytosolic calcium levels in a concentration-dependent manner. Our results indicate that the cytotoxic effects found at micromolar concentrations of U-83836E could be explained by an increase in [Ca2+]i. Finally, since U-83836E did not prevent the MMP decrease evoked by glutamate, it is suggested that antioxidant pharmacotherapy would not be sufficient to block the neurotoxic effects of glutamate.
    Toxicology and Applied Pharmacology 05/1999; 156(1):1-5. · 3.98 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The peripheral adrenergic effects of orphenadrine, an antiparkinsonian drug, have been evaluated in the rat vas deferens to investigate whether these properties are the same as those of other phencyclidine ligands. In the low micromolar range, orphenadrine enhanced electrically-evoked and exogenous noradrenaline contractile responses in the epididymal portion of rat vas deferens. It also induced spontaneous activity that was inhibited by prazosin (1 microM) but not by atropine (20 nM). It inhibited accumulation of [3H]noradrenaline in rat vas deferens (IC50 = 14.2+/-2.3 microM). Orphenadrine competitively inhibited [3H]nisoxetine binding in rat vas deferens membranes (Ki = 1.05+/-0.20 microM). It can be concluded that orphenadrine, at low micromolar concentrations, interacts with the noradrenaline reuptake system inhibiting its functionality and thus potentiating the effect of noradrenaline.
    Journal of Pharmacy and Pharmacology 04/1999; 51(3):307-12. · 2.03 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Chronic administration of methamphetamine to rats induces neurotoxicity characterized by a loss of striatal dopaminergic terminals and reactive gliosis. Subcutaneous administration of methamphetamine in a scheduled procedure of four doses (10 mg/kg) at 2 h interval also induces a significant increase in the peripheral-type benzodiazepine receptor (PBR) density. This increase is maximum (76%) at 72 h post-treatment in the striatum and disappears at 7 days, suggesting that microglia may have a predominant role in necrosis-phagocytosis of neuronal debris rather than acting in a restorative manner. Microgliosis is not restricted to the striatum since it is also evident in cerebellum (75.4% of PBR increase) and hippocampus (37.2% of PBR increase). In the areas with high density of adenosine transporter, the microgliosis phenomenon correlates well with a decrease of this nucleoside transporter (about 39%). Although the microgliosis and the decrease in adenosine transporter could be parallel and not related events, we can speculate that when microglia are activated, a down-regulation of adenosine transporter occurs, playing a role in tissue homeostasis. With the same dosing schedule, methamphetamine induces HSP72 expression in both cytoplasmic and nuclear fractions of the striatum, cerebellum and hippocampus. This expression is also evident in the cerebral cortex, where adenosine transporter population did not show any variation.
    Brain Research 01/1999; 814(1-2):120-6. · 2.88 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: In non-synchronized, subconfluent secondary cultures of rat cortical astrocytes, the selective group-I metabotropic glutamate (mGlu) receptor agonist 3,5-dihydroxyphenylglycine (DHPG) increased [methyl-3H]-thymidine incorporation. This effect was mediated by the activation of the mGlu5 receptor, which was shown to be present by either RT-PCR or Western blot analysis. The mixed mGlu receptor antagonist (+)-α-methyl-4-carboxyphenylglycine reduced the increase in both intracellular Ca2+ and [methyl-3H]-thymidine incorporation produced by DHPG. In contrast, (2S,1′R,2′R,3′R)-2-(2,3-dicarboxycylopropyl)glycine (DCG-IV), a potent and selective agonist of group-II mGlu receptors, reduced [methyl-3H]-thymidine incorporation in non-synchronized astrocyte cultures. The antiproliferative effect of DCG-IV was prevented by the selective group-II mGlu receptor antagonist (2S,1′S,2′S,3′R)-2-(2′-carboxy-3′-phenylcyclopropyl)glycine (PCCG-IV). The opposite effect of DHPG and DCG-IV on astrocyte proliferation was confirmed in cultures deprived of serum for 48 hours and then stimulated to proliferate with either epidermal growth factor (EGF) or the metabolically stable ATP analogue adenosine 5′-(β,γ-imido)-triphosphate (AMP-PNP).We conclude that activation of mGlu5 receptors enhances proliferation in cultured astrocytes, whereas activation of a receptor with pharmacological characteristics similar to those of mGlu2/3 receptors reduces proliferation. GLIA 21:390–398, 1997. © 1997 Wiley-Liss, Inc.
    Glia 12/1998; 21(4):390 - 398. · 5.07 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: 1. Electrically induced contractions of the epididymal portion of rat vas deferens were potentiated in concentration-dependent manner (0.1-30 microM) by different sigma and PCP receptor ligands (PCP, TCP, (+)-MK-801, dextromethorphan and (+)-3-PPP); dextrorphan did it in a minor extent. 2. Sigma and PCP receptor ligands also potentiated the effect of noradrenaline, inducing a reduction of the noradrenaline EC50 value in the rat vas deferens. The rank order of potencies was: PCP > TCP > (+)-3-PPP > (+)-MK-801 > dextrorphan > > > dextrometorphan. 3. In contrast, haloperidol (1 microM), a sigma receptor ligand, inhibited both the neurogenic and noradrenaline-induced responses in this tissue. 4. The effect of PCP and sigma receptor ligands on noradrenaline uptake was evaluated. All compounds tested, including haloperidol, inhibited the tritiated noradrenaline incorporation to the tissue. IC50 values were in the micromolar range, between 1.09 microM for dextrophan and 18 microM for dextrometorphan. 5. It is concluded that a direct interaction with the noradrenaline uptake system is involved in the potentiating effect of some sigma and PCP receptor ligands in the epididymal portion of rat vas deferens.
    Journal of Autonomic Pharmacology 08/1998; 18(4):239-44.

Publication Stats

612 Citations
101.97 Total Impact Points


  • 2001–2014
    • Universitat Rovira i Virgili
      Tarraco, Catalonia, Spain
  • 1996–2010
    • University of Barcelona
      • • Instituto de Biomedicina (IBUB)
      • • Facultad de Farmacia
      Barcelona, Catalonia, Spain
    • Spanish National Research Council
      • Institute of Biomedical Research of Barcelona
      Madrid, Madrid, Spain