Navigation Links
Study in this Week's Issue of Cell Finds Injected Growth Factor Spurs Heart Regeneration
Date:7/23/2009

Growth factor enhances heart regeneration, improves heart function without need for cardiac stem cells

(Vocus) July 16, 2009 -- Injured heart tissue normally can't regrow, but researchers at Children's Hospital Boston have now laid the groundwork for regenerating heart tissue after a heart attack, in patients with heart failure, or in children with congenital heart defects. In the July 24 issue of Cell, they show that a growth factor called neuregulin1 (NRG1), which is involved in the initial development of the heart and nervous system, can spur heart-muscle growth and recovery of cardiac function when injected systemically into animals after a heart attack.

After birth, heart-muscle cells (cardiomyocytes) normally withdraw from the cell cycle - meaning they stop dividing and proliferating. But the researchers, led by Bernhard Kühn, MD, and Kevin Bersell of the Department of Cardiology at Children's, were able to restart the cell cycle with NRG1, stimulating cardiomyocytes to divide and make copies of themselves -- even though they are not stem cells.

"Although many efforts have focused on stem-cell based strategies, our work suggests that stem cells aren't required and that stimulating differentiated cardiomyocytes to proliferate may be a viable alternative," says Kühn, the study's senior investigator and a practicing pediatric cardiologist at Children's since 2007.

When the team injected NRG1 into the peritoneal cavity of live mice after a heart attack, once daily for 12 weeks, heart regeneration was increased and pumping function (ejection fraction, assessed on echocardiograms) improved as compared with untreated controls. The NRG1-injected mice also lacked the left-ventricular dilation and cardiac hypertrophy that typify heart failure; both were seen in the controls.

When the researchers also stimulated production of a cellular receptor for NRG1, known as ErbB4, cardiomyocyte proliferation was further enhanced, demonstrating that NRG1 works by stimulating this receptor. They also identified the specific kinds of cardiomyocytes (mononucleated) that are most likely to respond to treatment.

In 2007, Kühn and colleagues first demonstrated that the heart has dormant regenerative capacities that can be reawakened. Kühn developed a sponge-like patch, soaked in a compound called periostin that is abundant in the developing fetal heart (and in injured skeletal muscle) but scarce in adult hearts. When the patch was placed over the site of cardiac injury in rats, it induced cardiomyocyte proliferation and improved heart function (Nature Medicine 2007; 13:962-9). Similar results were seen in larger animals, and periostin is now in preclinical development at Children's Hospital Boston for future application in human patients with heart failure.

The new work adds a second compound to the heart-regeneration toolbox, and reveals how both periostin and NRG-1 work at the cellular and molecular level, an essential step in predicting possible side effects. Both compounds ultimately act on the same cellular pathway, Kühn found.

"We applied periostin locally at the site of cardiac injury, but NRG1 works when given by systemic injection - a very promising result that suggests it may be feasible to use this in the clinic to treat heart failure," says Kühn, who won a first prize Young Investigator Award, from the American College of Cardiology in 2007.

The study was funded by the Department of Cardiology at Children's Hospital Boston, the Charles Hood Foundation, and the American Heart Association.

Children's Hospital Boston is home to the world's largest research enterprise based at a pediatric medical center, where its discoveries have benefited both children and adults since 1869. More than 500 scientists, including eight members of the National Academy of Sciences, 12 members of the Institute of Medicine and 12 members of the Howard Hughes Medical Institute comprise Children's research community. Founded as a 20-bed hospital for children, Children's Hospital Boston today is a 397-bed comprehensive center for pediatric and adolescent health care grounded in the values of excellence in patient care and sensitivity to the complex needs and diversity of children and families. Children's also is the primary pediatric teaching affiliate of Harvard Medical School. For more information about the hospital and its research visit: www.childrenshospital.org/newsroom.

(Note to reporters: Cell is also issuing a press release on this paper. Images are available.)

CONTACT:
Rob Graham
Children's Hospital Boston
617-919-3110

# # #

Read the full story at http://www.prweb.com/releases/Childrens_Hospital_Boston/cardiology/prweb2650074.htm.


'/>"/>
Source: PRWeb
Copyright©2009 Vocus, Inc.
All rights reserved  

Related medicine news :

1. Study provides documentation that tumor stem-like cells exist in benign tumors
2. Major Study of Malpractice Insurance Finds No Basis to Limit Liability of Unsafe Health Care Providers
3. Eliminating Cell Receptor Prevents Infections in Animal Study
4. UC Davis study highlights work-life issues of female surgeons
5. Quigley Corporation Announces Final Results of Quigley Pharmas Phase IIb Study
6. AcelRx Announces Perfect Performance of Handheld Component of ARX-01 Sufentanil NanoTab PCA System in a Phase 2 Study
7. First national study to examine rock climbing-related injuries
8. Study aims to induce recovery from ankylosing spondylitis
9. New Study Finds Yet Another Link to Cancer, Synthetic Hormones
10. RI Hospital first in country to enroll patient in new study for recurrent chest wall breast cancer
11. US Oncology Research Network Participates in Phase III Follow-up Study to BiPars Investigational Cancer Drug BSI-201
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Study in this Week's Issue of Cell Finds Injected Growth Factor Spurs Heart Regeneration 
(Date:2/11/2016)... ... February 12, 2016 , ... Fitbody Personal Training offers ... fun and exciting way to get fit and healthy. Located in Phoenixville, PA, the ... for a class designed for horseback riders who want to lose weight and tone ...
(Date:2/11/2016)... ... February 11, 2016 , ... SPH Analytics announced ... analytics leader’s population health solutions, MDinsight® and IndiGO®, for its primary care clinicians. ... system. Details of the contract were not disclosed. , As the healthcare market ...
(Date:2/11/2016)... ... February 11, 2016 , ... Dr. Sadati’s recent ... cosmetic procedures. Along with performing procedures, the magazine also highlights that Dr. Sadati ... procedures. One of the most common procedures he performs is his natural facelift. ...
(Date:2/11/2016)... TN (PRWEB) , ... February 11, 2016 , ... ... cleaning business to a new market, and it’s the buildings of Nashville that will ... that when I needed to relocate to Nashville, there was no question that I ...
(Date:2/11/2016)... ... February 11, 2016 , ... ... diabetes has been gearing up for their simultaneous grand openings in March. All ... right now that you’re probably wondering, is reversing diabetes possible? According to this ...
Breaking Medicine News(10 mins):
(Date:2/11/2016)... -- PRO-DEX, INC. (NasdaqCM: PDEX) today announced financial results for ... Company also filed its Quarterly Report on Form 10-Q for ... and Exchange Commission today. --> ... --> --> Net sales for the three ... to $5.4 million from $2.8 million for the three months ...
(Date:2/11/2016)... FRANCISCO , Feb. 11, 2016   Health ... advancement of new health technologies, announced today " 10 ... achievements in health tech over the past ten years.   ... For nearly a decade, Health 2.0 has served as ... showcased and connected with thousands of technologies, companies, innovators, ...
(Date:2/11/2016)... WESTPORT, Conn. , Feb. 11, 2016  AfterPill.com ... decision to recommend alcohol abstinence for all women who ... women in the U.S. each year and raises the ... --> --> According to the ... U.S., 70% of women of child-bearing age, who have ...
Breaking Medicine Technology: