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  • 1 Neuropharmacology Research Group of the Hungarian Academy of Sciences, Department of Pharmacology and Pharmacotherapy, University of Pécs H-7643, P. O. Box 99, Pécs, Hungary
  • | 2 Department of Pharmacology University of Debrecen, Debrecen, Hungary
  • | 3 Department of Pharmacology University of Debrecen, Debrecen, Hungary
  • | 4 Department of Pharmacology University of Debrecen, Debrecen, Hungary
  • | 5 Neuropharmacology Research Group of the Hungarian Academy of Sciences, Department of Pharmacology and Pharmacoterapy University of Pécs, Pécs, Hungary H-7624 Pécs, Szigeti út 12, Hungary
  • | 6 Neuropharmacology Research Group of Hungarian Academy of Sciences at Department of Pharmacology and Pharmacotherapy Pécs University, Faculty of Medicine, Pécs, Hungary H-7643 Pécs, Szigeti u. 12, Hungary
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The effect of capsaicin (0.1mM) on heart rate and coronary flow was studied in Langendorff-perfused heart from streptozotocin-induced (50 mg/kg i.v.) diabetic rats where sensory neuropathy developed. In hearts from animals 4- and 8-week diabetes baseline heart rate and coronary flow decreased from 317.9±2.9 b.p.m. and 13.4±0.7 ml/min to 255.1±12.7 and 219.8±2.8 b.p.m. and 8.9±0.6 and 10.0±0.1 ml/min (P<0.05), respectively. Capsaicin significantly decreased both variables in either normal or 4-week diabetic animals its effects, however, on coronary flow or heart rate were missing in preparations from 8-week diabetic rats. Endothelin-1 (0.1 nM), the putative mediator of the capsaicin effect, significantly decreased heart rate and coronary flow irrespective of the presence or absence of diabetes. In the femoral nerve of streptozotocin-treated animals conduction velocity involving both fast conducting A- and slow-conducting C-fibres was decreased proportional to the duration of the pre-existing diabetic state. It is concluded that in insulin deficient diabetes the diminished responses evoked by capsaicin on heart rate and coronary flow are signs of sensory neuropathy. This is related to a feeble endothelin release from sensory nerve endings without changes in post-receptor mechanisms mediating the endothelin effects.

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Senior editors

Editor(s)-in-Chief: Rosivall, László

Honorary Editor(s)-in-Chief): Monos, Emil

Managing Editor(s): Bartha, Jenő; Berhidi, Anna

Co-editor(s): Koller, Ákos; Lénárd, László; Szénási, Gábor

Assistant Editor(s): G. Dörnyei (Budapest), Zs. Miklós (Budapest), Gy. Nádasy (Budapest)

Hungarian Editorial Board

      Benedek, György (Szeged)
      Benyó, Zoltán (Budapest)
      Boros, Mihály (Szeged)
      Chernoch, László (Debrecen)
      Détári, László (Budapest)
      Hamar, János (Budapest)
      Hantos, Zoltán (Szeged)
      Hunyady, László (Budapest)
      Imre, Sándor (Debrecen)
      Jancsó, Gábor (Szeged)
      Karádi, Zoltán (Pécs)
      Kovács, László (Debrecen)
      Palkovits, Miklós (Budapest)
      Papp, Gyula (Szeged)
      Pavlik, Gábor (Budapest)
      Spät, András (Budapest)
      Szabó, Gyula (Szeged)
      Szelényi, Zoltán (Pécs)
      Szolcsányi, János (Pécs)
      Szollár, Lajos (Budapest)
      Szücs, Géza (Debrecen)
      Telegdy, Gyula (Szeged)
      Toldi, József (Szeged)
      Tósaki, Árpád (Debrecen)

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Acta Physiologica Hungarica
Language English
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1950
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Founder Magyar Tudományos Akadémia
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