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Abstract

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Purpose : The proper functioning of all smooth muscle structures depends on the
ability of normal blood to deliver oxygen and nutrients to the muscles. In addition,
hypoxia has been shown to inhibit the contractile response to various forms of
stimulation. The contractile response of the vas deferens can be divided into two phases:
an initial rapid increase in tension(phasic contraction) and prolonged period of sustained
tension(tonic contraction). The aim of this study was to determine the effect of hypoxia
on the ability of the vas deferens to sustain tension .
Materials and Methods : The isolated strips of rat vas deferens were studied for
Isometric tension measurement under normoxia and hypoxia in the organ chamber.
Effects of phenylephrine(Phe) and acetylcholine(Ach) on the rat vas deferens tissue were
monitored under normoxia and hypoxia.
Results : The results of these studies can be summerized as follows; (1) hypoxia
induced time dependent decrease in both phasic and tonic contraction in response to
electrical field stimulation(4 and 32Hz). The rate of inhibition of the tonic contraction
was significantly and immediatly greater than that of the phasic contraction in both the
prostatic and epididymal vas deferens, which was much prominent. (2) hypoxia(5min)
increased the basal tension of prostatic vas deferens only to Phe(10-3M)
and Ach(10-3M). But In the response of epididymal vas deferens to
Phe(10-3M) and Ach(10-3M), rhythmic contractions
disappeared.
Conclusions : In conclusion, the contractile response of rat Vas deferens to electrical
field stimulation under hypoxia were decreased and basal tension of prostatic vats
deferens to Phe(10-3M) or Ach(10-3M) was increased This
effect can interfere the sperm expulsion by changing normal contractability of the vas
deferens.

Å°¿öµå

Vas deferens; Hypoxia; Electrical field stimulation; Phenylephrine; Acetylcholine;

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