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  • 1
    Electronic Resource
    Electronic Resource
    5-Hydroxytryptamine is emetogenic in the house musk shrew, Suncus murinus (1991)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 344 (1991), S. 564-567 
    Details
    ISSN: 1432-1912
    Keywords: Vomiting ; 5-HT ; 2-Me-5-HT ; 5-HT3 Receptor antagonism ; Cancer Chemotherapy ; House musk shrew (Suncus murinus)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The emetic effects of 5-hydroxytryptamine (5-HT) and 5-HT3 receptor agonists were investigated in the house musk shrew, Suncus murinus. 5-Hydroxytryptamine (5-HT; i.p., i.v., s.c.) and 2-methyl-5-HT (2-Me-5HT; i.p.) but not 5-hydroxyindoleacetic acid (i.p.) or 5-ethoxytryptamine (i.p.) induced emesis with very short latency. Tropisetron (ICS 205-930, a 5-HT3 receptor antagonist, s.c.) blocked the emesis induced by 5-HT (10 mg/kg, i.p.) and 2-Me-5-HT (5 mg/kg, i.p.) with respective ID50 values of 7.8 and 70.9 μg/kg. Pindolol (5-HT1 receptor antagonist) and ketanserin (5-HT2 receptor antagonist) were about 100 times less potent than tropisetron. The emesis induced by 5-HT was prevented by surgical vagotomy but not by pretreatment with a combination of atropine (0.1 mg/kg, s.c.) and hexamethonium (10 mg/kg, s.c.). These results clearly indicate that 5-HT is emetogenic probably through a stimulation of peripheral 5-HT3 receptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170653
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  • 2
    Electronic Resource
    Electronic Resource
    Contractile response and electrophysiological properties in enzymatically dispersed smooth muscle cells of rat vas deferens (1987)
    Springer
    Pflügers Archiv 408 (1987), S. 112-119 
    Details
    ISSN: 1432-2013
    Keywords: Rat vas deferens ; Single smooth muscle cells ; Sensitivity to norepinephrine ; Voltage clamp ; Action potentials ; Membrane currents ; Ca current
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Electrophysiological studies were performed on single smooth muscle cells isolated from the vas deferens of the rat. The tissue was preincubated in Ca-free modified Tyrode's solution for 1 h and then transferred to a high-K solution for 1 h. It was next minced and treated with the enzyme solution composed of 600–800 unit/ml collagenase and 40 unit/ml elastase. The procedure yielded about 50% spindle shaped Ca-tolerant cells (100–250 μm in length and about 10 μm in diameter). These cells could contract during the superfusion with the solutions containing 10−8 to 10−3M norepinephrine (NE) or adenosine triphosphate (ATP). The cells isolated from the epididymal portion were more sensitive to norepinephrine than were those from the prostatic part. Their basic electrical properties were studied using tight-seal suction electrode technique. The cells had resting potentials around −40 mV and their input resistance was about 0.8 GΩ. Action potentials could be evoked by application of depolarizing current. During whole cell voltage clamp, an inward current followed by an outward current was recorded when 800 ms pulses from a holding potential of −60 mV to test potentials positive than −40 mV were applied. The transient outward current generally recorded in other smooth muscle cells was not seen in these cells. The amplitude of the inward current was Ca dependent and sensitive to a Ca antagonist, nicardipine, indicating that Ca ion is the main carrier of this component of the current. When the pipette was filled with Cs-containing solution, the outward current was abolished. In this condition, the reversal potential of Ca current was +53.4 mV, and the time course of inactivation was composed of more than one exponential component. The results suggest that these isolated cells retain many characteristics of analogous multicellular preparation and that they are a useful model of the postsynaptic properties in smooth muscle especially when studied electro-physiologically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00581338
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    Paper (German National Licenses)
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