Thermoreception of Paramecium: Different Ca2+ Channels Were Activated by Heating and Cooling

Thermoreception of Paramecium: Different Ca2+ Channels Were Activated by Heating and Cooling A Paramecium cell responded to heat and cold stimuli, exhibiting increased frequency of directional changes in its swimming behavior. The increase in the frequency of directional changes was maintained during heating, but was transient during cooling. Although variations were large, as expected with this type of electrophysiological recording, results consistently showed a sustained depolarization of deciliated cells in response to heating. Depolarizations were also consistently observed upon cooling. However, these depolarizations were transient and not continuous throughout the cooling period. These depolarizations were lost or became small in Ca2+-free solutions. In a voltage-clamped cell, heating induced a continuous inward current and cooling induced a transient inward current under conditions where K+ currents were suppressed. The heat-induced inward current was not affected significantly by replacing extracellular Ca2+ with equimolar concentrations of Ba2+, Sr2+, Mg2+, or Mn2+, and was lost upon replacing with equimolar concentration of Ni2+. On the other hand, the cold-induced inward current was not affected significantly by Ba2+, or Sr2+, however the decay of the inward current was slowed and was lost or became small upon replacing with equimolar concentrations of Mg2+, Mn2+, or Ni2+. These results indicate that Paramecium cells have heat-activated Ca2+ channels and cold-activated Ca2+ channels and that the cold-activated Ca2+ channel is different from the heat-activated Ca2+ channel in the ion selectivity and the calcium-dependent inactivation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Membrane Biology Springer Journals

Thermoreception of Paramecium: Different Ca2+ Channels Were Activated by Heating and Cooling

Loading next page...
 
/lp/springer_journal/thermoreception-of-paramecium-different-ca2-channels-were-activated-by-PE1vh0sJeb
Publisher
Springer-Verlag
Copyright
Copyright © Inc. by 1999 Springer-Verlag New York
Subject
Life Sciences; Biochemistry, general; Human Physiology
ISSN
0022-2631
eISSN
1432-1424
D.O.I.
10.1007/s002329900517
Publisher site
See Article on Publisher Site

There are no references for this article.

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

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

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

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.

See the journals in your area

Monthly Plan

  • Read unlimited articles
  • Personalized recommendations
  • No expiration
  • Print 20 pages per month
  • 20% off on PDF purchases
  • Organize your research
  • Get updates on your journals and topic searches

$49/month

Start Free Trial

14-day Free Trial

Best Deal — 39% off

Annual Plan

  • All the features of the Professional Plan, but for 39% off!
  • Billed annually
  • No expiration
  • For the normal price of 10 articles elsewhere, you get one full year of unlimited access to articles.

$588

$360/year

billed annually
Start Free Trial

14-day Free Trial