We show here that explants of tunica dartos smooth muscle from the rat scrotum contract in response to cooling. The tension developed during cooling was potentiated by the presence of the overlying skin. This potentiation remained even if direct connection between the muscle and skin was severed by cutting the skin from the muscle but leaving the muscle and skin in contact. The potentiation did not depend on any inherent response of the skin since isolated skin showed no change in tension with cooling. The muscle exhibited a sigmoid dose response to noradrenaline with an EC50 (dose for 50% contractile response) of 1.03±0.02 × 10−6 M. Acetylcholine altered neither resting tone or the sustained contraction induced by a submaximal dose of noradrenaline. The contractile response to an EC50 and maximal dose of noradrenaline was attenuated at both 15 and 40°C relative to the response observed at 33°C. We hypothesise that the potentiation of tunica dartos muscle contraction with cooling caused by the presence of the scrotal skin depends on some soluble agent released from the skin and affecting the underlying muscle. Noradrenaline release from the skin, or some molecule with alpha-receptor activity, may account for a small proportion of the potentiation. The remainder of the effect does not depend on prostaglandins, or other products of the cyclooxygenase cascade, or the nitric oxide system.
Pflügers Archiv European Journal of Physiologyl of Physiology – Springer Journals
Published: Jul 7, 2005
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.
All for just $49/month
Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.
Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.
It’s easy to organize your research with our built-in tools.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera