Navigation Links
Lungs' mast cells could provide new treatment target for asthma, other respiratory disease
Date:1/29/2008

NEW YORK (Jan. 29, 2008) -- An enzyme released by mast cells in the lungs appears to play a key role in the tightening of airways that is a hallmark of asthma -- pointing to a potential new target for treatment against the illness.

Reporting in the online edition of Proceedings of the National Academy of Sciences, a team at Weill Cornell Medical College explains that during an immune response, mast cells release the enzyme -- called renin -- which in turn produces angiotensin, a potent constrictor of the smooth muscle that lines airways.

Mast cells are normally present in small numbers in all organs, and are best known for their role in allergy, shock, wound healing and defense against pathogens.

"Back in 2005, our team was the first to discover that mast cells in the heart released renin locally, which elicited heart arrhythmias by triggering angiotensin production within the heart," explained co-senior author Dr. Roberto Levi, professor of pharmacology at Weill Cornell Medical College.

"Now, we've expanded those findings to the lungs, where similar mechanisms appear to work locally to help trigger constriction in the airway," he says.

Renin is no stranger to medical research -- for decades, doctors have known that the enzyme is produced by the kidney in relatively large quantities for systemic use throughout the body. But the Weill Cornell team was the first to discover that mast cells also produced their own "local" supply of the enzyme, at a variety of body sites.

"In the heart and now the lungs, this localized production of renin appears to have a profound effect on nearby tissues," says co-senior author Dr. Randi Silver, associate professor of physiology and biophysics at Weill Cornell.

"More study is needed, of course, but our finding suggests that drugs that target renin might prove effective agents in dampening asthma or other respiratory diseases," she says. "These types of 'renin inhibitors' are, in fact, currently being developed by the pharmaceutical industry right now."

The genesis of the new study came through the efforts of the study's lead author, Arul Veerappan, now a postdoctoral researcher in Dr. Silver's laboratory. He looked closely at rings of bronchial tissue from rodents, discovering that mast cells in these rings released renin along with other substances.

"You ended up getting the same biochemical cascade that we had seen elsewhere -- newly produced renin bringing about a local rise in angiotensin in tissues," Veerappan says.

Research led by co-author Alicia Reid, also a postdoctoral associate in Dr. Silver's lab, led to another first. Using a technology Reid developed, the researchers confirmed for the first time that mast cells from human lung tissue release a form of renin that is nearly identical to renin found in human mast cells grown in culture or human kidney renin.

"That's a big achievement, because it supports the notion that the mechanism we have discovered is not just a laboratory phenomenon -- it's actually occurring in the living human lung," Dr. Levi notes.

New research suggests that local renin production may also be crucial in diseases marked by tissue fibrosis (stiffening). In fact, Dr. Silver's lab is now looking at the role locally produced renin might play in a rare, deadly illness called idiopathic pulmonary fibrosis (IPF), where lung tissue becomes increasingly inflexible over time.

"We're interested in any disease in which we can also detect local renin/angiotensin production because it appears to be linked to fibrosis, vasoconstriction, and now bronchoconstriction," Dr. Silver explains.

The goal of all this research: new treatment targets for a range of illnesses.

"Of course, we already have antihypertensive medicines -- such as ACE inhibitors and angiotensin receptor blockers -- that focus on curbing angiotensin in a more systemic way," says Dr. Levi. "But if we could find agents that dampen this renin-angiotensin cascade locally -- in the heart or the lung, for example -- that could prove to be a formidable new weapon against disease."


'/>"/>

Contact: Andrew Klein
ank2017@med.cornell.edu
212-821-0560
New York- Presbyterian Hospital/Weill Cornell Medical Center/Weill Cornell Medical College
Source:Eurekalert

Related medicine news :

1. Hookah Smoking as Tough on Lungs as Cigarettes
2. CT Scans Catch More Clots in Lungs
3. Traffic Pollution Hurts Asthmatic Kids Lungs
4. Cleaner Air Leads to Healthier Lungs
5. Aerosol launches immune response in lungs to wipe out lethal infections
6. Novel MRI Technique Shows Secondhand Smoke Damages Lungs
7. Special MRI Shows Secondhand Smoke Damages Lungs
8. Secondhand smoke damages lungs, MRIs show
9. Novel MRI technique shows secondhand smoke damages lungs
10. Drink or Two a Day May Help Lungs
11. Statins reduce loss of function, keeping old lungs young - even in smokers
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/25/2016)... ... June 25, 2016 , ... ... issues and applications at AcademyHealth’s Annual Research Meeting June 26-28, 2016, at the ... several important health care topics including advance care planning, healthcare costs and patient ...
(Date:6/25/2016)... ... June 25, 2016 , ... As a lifelong Southern Californian, Dr. Omkar Marathe ... from the David Geffen School of Medicine at UCLA. He trained in Internal Medicine ... his fellowship in hematology/oncology at the UCLA-Olive View-Cedars Sinai program where he had the ...
(Date:6/24/2016)... ... ... Those who have experienced traumatic events may suffer from a complex set of ... or alcohol abuse, as a coping mechanism. To avoid this pain and suffering, Serenity ... event. , Trauma sufferers tend to feel a range of emotions, from depression, guilt, ...
(Date:6/24/2016)... (PRWEB) , ... June 24, 2016 , ... ... now offering micro-osteoperforation for accelerated orthodontic treatment. Dr. Cheng has extensive experience with ... Damon brackets , AcceleDent, and accelerated osteogenic orthodontics. , Micro-osteoperforation is a ...
(Date:6/24/2016)... ... June 24, 2016 , ... The Haute Beauty Network, ... M. Weintraub as a prominent plastic surgeon and the network’s newest partner. ... the most handsome men, look naturally attractive. Plastic surgery should be invisible.” He ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)...   Pulmatrix, Inc ., (NASDAQ: PULM ... announced today that it was added to the Russell ... comprehensive set of U.S. and global equity indexes on ... milestone for Pulmatrix," said Chief Executive Officer Robert ... progress in developing drugs for crucial unmet medical needs, ...
(Date:6/23/2016)... Any dentist who has made an implant supported ... Many of them do not even offer this as a ... laboratory costs involved. And those who ARE able to offer ... high cost that the majority of today,s patients would not ... Zadeh , founder of Dental Evolutions Inc. and inventor of ...
(Date:6/23/2016)... 23, 2016 Capricor Therapeutics, ... a biotechnology company focused on the discovery, development ... patient enrollment in its ongoing randomized HOPE-Duchenne clinical ... 50% of its 24-patient target. Capricor expects the ... quarter of 2016, and to report top line ...
Breaking Medicine Technology: