Navigation Links
Protein provides link between calcium signaling in excitable and non-excitable cells
Date:10/1/2010

A calcium-sensing protein, STIM1, known to activate store-operated calcium channels has been found to also inhibit voltage-operated calcium channels, according to researchers at Temple University.

The researchers published their findings, The Calcium Store Sensor, STIM1, Reciprocally Controls Orai and Cav1.2 Channels, in the Oct. 1 issue of Science magazine (www.sciencemag.org).

Calcium, not just important for bones and teeth, is a universal signaling agent that is pivotal in controlling a wide range of cell functions including fast muscle and nerve responses and slower response such as cell division, cell growth, apoptosis or programmed cell death and even fertilization of eggs.

Calcium is stored in cells and rapidly released out and pumped back to control things like contraction of muscle or the triggering of immune cells said Donald Gill, Professor and Chair of Biochemistry in Temple's School of Medicine and the study's lead researcher.

He said that the STIM1 protein, which he helped discover about 5 years ago, was found to play a major role in sensing the low levels of calcium in cell stores and activating the highly selective Orai calcium channel to allow calcium to flow back into the cell.

"We thought it seemed crazy that the STIM1 protein goes through this incredible dance but the only thing it does is activate the Orai channel," he said. "It seemed difficult to believe it only had this one specific function."

About two years ago, Gill and his colleagues noticed that in addition to activating the Orai channel to allow calcium to trickle back into the cell stores, STIM1 was also inhibiting the function of the crucial and widespread voltage-operated calcium channel, known as the L-typechannel.

"At the time, we thought only electrically excitable cells, like cardiac, neural and skeletal cells, had L-type (or long-lasting) calcium channels," he said. "So it was surprising that the STIM1 protein known to function mostly in non-excitable cells was having a pretty profound effect on the L-type calcium channels".

"This is particularly true in tissue like smooth muscle where it is sort of like a hybrid between an excitable and a non-excitable cell, because it has the voltage-operated calcium channel and the Orai calcium channel, as well as the very powerful STIM sensing system," he said.

Gill said that the researchers' finding gives a common mechanism for calcium signaling in both excitable and non-excitable cells, a link that was never before known.

"It's a very basic finding, but it's another whole area of control that people didn't know about before," he said. "They knew there were L-type calcium channels in many non-excitable cells, but they didn't seem to have any function. Now it seems very possible that the reason they didn't function is that the STIM1 protein was suppressing their function."


'/>"/>

Contact: Preston M. Moretz
pmoretz@temple.edu
215-204-4380
Temple University
Source:Eurekalert

Related biology news :

1. Photonic crystal biosensors detect protein-DNA interactions
2. Penn biophysicists create new model for protein-cholesterol interactions in brain and muscle tissue
3. Dont forget the vitamin A when working with its carrier protein
4. Saliva proteins could help detection of oral cancer
5. The structure of the Mre11 protein bound to DNA
6. New lab manual focuses on essential methods for purifying and characterizing proteins
7. Proteins in sperm unlock understanding of male infertility says new study
8. Response to immune protein determines pathology of multiple sclerosis
9. Columbia to award 2008 Horwitz Prize to Arthur Horwich & Ulrich Hartl for cellular protein folding
10. Human protein atlas will help pinpoint disease
11. How neuronal activity leads to Alzheimers protein cleavage
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/7/2017)... WARSAW, Ind. , Feb. 7, 2017 ... global leader in musculoskeletal healthcare, will present at the ... Lotte New York Palace Hotel on Wednesday, February 15, ... A live webcast of the presentation can be accessed ... for replay following the conference via Zimmer Biomet,s Investor ...
(Date:2/3/2017)... -- Texas Biomedical Research Institute announced that its Board of Trustees ... the Institute,s new President and CEO. Dr. Schlesinger will take ... is currently the Chair of the Department of Microbial Infection ... Biology at Ohio State University. "We are delighted ... of Texas Biomed," said Dr. James O. Rubin , ...
(Date:2/2/2017)... -- EyeLock LLC, a market leader of iris-based identity authentication ... You Should Know About Biometrics in the Cloud ."  ... a growing concern. In traditional schemes, cryptography is used ... schemes such as username/password suffer from inherent weaknesses. ... elegant solution to the problem of high-security user authentication. ...
Breaking Biology News(10 mins):
(Date:2/24/2017)... ... ... Delpor, Inc. (Delpor), a biotechnology company focused on drug delivery, today announced ... for the further advancement of the company’s 3-month olanzapine product ( DLP-119 ). The ... therapeutic levels of olanzapine for a period of 3 months., “We are honored and ...
(Date:2/24/2017)... 24, 2017  Driven by consumers, preference towards ... the fastest growing categories, finds the recently published ... Personal Care: Multi-regional Market Analysis and Opportunities ... firm Kline. "Biotechnology actives are derived ... more effective for skin and hair care applications," ...
(Date:2/24/2017)... , Feb. 24, 2017  OncoSec Medical Incorporated ... immunotherapies, will host a Key Opinion Leader event to ... an oral and poster presentation at the upcoming 2017 ... The KOL event will be held in-person and via ... EST / 9:00 AM PST at the Lotte New ...
(Date:2/23/2017)... 23, 2017  MIODx announced today that it ... immunotherapy technologies from the University of California, San ... to monitor a patient for response to immune ... The second license extends the technology with a ... to have an immune-related adverse event (IRAE) from ...
Breaking Biology Technology: