Navigation Links
Promising and perilous? The ambivalent role of the CXCL12/ CXCR4 axis in heart repair
Date:11/30/2011

The chemokine CXCL12 acts as a chemical signal which mobilizes hematopoietic and other types of stem cells to leave the bone marrow and enter the circulation. Secretion of CXCL12 also guides these cells to sites at which the perfusion of tissue is sub-optimal due to localized obstruction of blood flow. These capabilities have made CXCL12 and its cognate receptor CXCR4 interesting candidates for therapies aimed at mitigating the effects of damage to the heart caused by myocardial infarction.

A team of researchers led by Professor Christian Weber of the Medical Center of the University of Munich has now taken a closer look at the normal physiological function of this ligand-receptor couple. Their results reveal that the molecules have "rather ambivalent roles," as Weber puts it.

Myocardial infarction remains one of the leading causes of death in Western societies. The condition occurs when parts of the heart muscle can no longer be adequately supplied with oxygen because blood flow through the coronary arteries is impeded. Researchers have therefore suggested that CXCL12 and CXCR4 could perhaps be used therapeutically to direct stem cells required for the formation of new blood vessels to migrate into ischemic, i.e. poorly perfused, tissues and thus help to increase blood flow in such areas.

"The precise physiological functions of the chemokine and its receptor are poorly understood, although these are the crucial determinants of their therapeutic potential and of possible side-effects," Weber points out. "We therefore studied the effects of infarction in an animal model in which the amount of CXCR4 produced is specifically reduced. We focused on the molecular and cellular consequences of infarction, particularly with respect to the recovery of cardiac function, formation of scar tissue, severity of inflammation, and neovascularization of heart muscle."

To their surprise the researchers found that reduction of the CXCR4 level correlated with significant reductions in infarct size and the degree of tissue inflammation, but that recovery of blood flow and neovascularization were concomitantly decreased. These opposing effects together meant that heart function was equally impaired whether or not the level of CXCR4 function was reduced.

"However, we did see some evidence for an improvement in adaptation to sub-optimal levels of oxygen," Weber remarks. "Although we cannot assume that these results are immediately applicable to the human heart, they do point toward the possibility especially in the case of systemic therapy of quite critical side-effects. We should perhaps focus on more localized approaches, such as the direct injection of stem cells with higher levels of CXCR4, or of CXCL12 variants that remain confined to the damaged areas of the heart or retain their activity in the coronary arteries for longer." (suwe/PH)


'/>"/>

Contact: Luise Dirscherl
dirscherl@lmu.de
49-892-180-2706
Ludwig-Maximilians-Universitt Mnchen
Source:Eurekalert

Related medicine news :

1. New artemisinin-based treatment against malaria promising
2. New Multiple Sclerosis Therapy Promising in Early Trial
3. Promising Malaria Vaccine May Save Childrens Lives
4. Promising new approach to treating debilitating nervous system disease
5. FDG-PET appears promising for predicting prognosis of patients with inoperable NSCLC
6. New half-match bone marrow transplant procedure yields promising outcomes for cancer patients
7. DOE laboratories help develop promising new cancer fighting drug, vemurafenib
8. Experimental Drug Promising Against Tough-to-Treat Asthma
9. INFORMS: CARE positions disaster relief with promising discipline of humanitarian logistics
10. Massachusetts General Hospital, Iacocca Foundation announce promising results of Phase I diabetes trial
11. Fighting cancer with cancer: Mayo Clinic finds promising use for thyroid cancer gene
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/29/2017)... ... April 29, 2017 , ... ... infertility. These methods observe the naturally occurring signs and symptoms of a ... most fertile time. , Natural family planning and fertility are special interests ...
(Date:4/29/2017)... ... 29, 2017 , ... Saturday, April 29, marks World Veterinary ... have on animal health and welfare as well as on public health. The ... a theme each year and this year have selected “Antimicrobial Resistance—From Awareness to ...
(Date:4/28/2017)... , ... April 28, 2017 , ... ... announce the integration of Microsoft(R) Word(TM) Online(TM), which enables sleep physicians to create ... it streamlines the reporting process and provides a familiar interface that does not ...
(Date:4/28/2017)... Pass, OR (PRWEB) , ... April 28, 2017 ... ... Ijose, http://www.foodsthathealdaily.com , http://www.wiredlifesolutions.com , “Computers are everywhere and they’re ... Hour Power of Water, Global Climate Change and Your Health on Voice America ...
(Date:4/28/2017)... ... April 28, 2017 , ... The Texas Cord Blood ... to the labor and delivery team at Women’s Hospital at Renaissance in Edinburg for ... birth at the hospital and decide to donate. , “Women’s Hospital at Renaissance ...
Breaking Medicine News(10 mins):
(Date:4/20/2017)... , April 20, 2017  Vivify Health, the pioneer ... has been awarded a very significant patent for the ... to continual care via digital health.  This landmark patent ... property and further secures Vivify,s position as the leader ... 2009, was the first company to apply consumer mobile ...
(Date:4/20/2017)... , April 20, 2017 Research ... "Global Biosimilar Pipeline and Market Prospects: Addressing Production Complexities ... to their offering. ... "Global Biosimilar Pipeline and Market Prospects: Overcoming ... provides an in-depth assessment of the current trends in ...
(Date:4/20/2017)... April 20, 2017 Research and Markets has ... Innovation Driven by Rapidly Expanding Injectables Market and Increasing Usage of ... ... delivery technologies will rise from USD 20 Billion in 2015 to ... Drug Delivery Technologies - Innovation Driven by Rapidly Expanding Injectables Market ...
Breaking Medicine Technology: