Navigation Links
Scientists Discover Molecular Pathway for Organ Tissue Regeneration and Repair
Date:2/15/2010

CINCINNATI, Feb. 15 /PRNewswire-USNewswire/ -- Scientists have discovered a molecular pathway that works through the immune system to regenerate damaged kidney tissues and may lead to new therapies for repairing injury in a number of organs.

The findings, reported in this week's Proceedings of the National Academy of Sciences (PNAS), come from collaborative research led by Cincinnati Children's Hospital Medical Center and the Brigham & Women's Hospital of Harvard Medical School.

The study may have significant medical ramifications as currently there are no effective treatments for acute kidney injury – a growing problem in hospitals and clinics, according to the study's senior co-authors, Richard Lang, Ph.D., a researcher in the divisions of Pediatric Ophthalmology and Developmental Biology at Cincinnati Children's, and Jeremy Duffield, M.D., Ph.D., a researcher at Brigham and Women's Hospital. Acute kidney injury is a significant cause of kidney disease, cardiovascular complications and early death, affecting as many as 16 million children and adults in the United States.

The molecular repair pathway involves white blood cells called macrophages – part of the immune system – that respond to tissue injury by producing a protein called Wnt7b. Scientists identified the macrophage-Wnt7b pathway during experiments in mice with induced kidney injury. Wnt7b is already known to be important to the formation of kidney tissues during embryonic organ development. In this study the scientists found the protein helped initiate tissue regeneration and repair in injured kidneys.

"Our findings suggest that by migrating to the injured kidney and producing Wnt7b, macrophages are re-establishing an early molecular program for organ development that also is beneficial to tissue repair," said Dr. Lang. "This study also indicates the pathway may be important to tissue regeneration and repair in other organs."

Wnt7b is part of the Wnt family of proteins, which are known to help regulate cells as they proliferate, grow and become specific cell types for the body. Wnt proteins have also been linked to the regulation of stem cells in bone marrow and skin, which suggested to researchers of the current study that Wnt might have a role in tissue regeneration.

The researchers conducted a number of experiments of kidney injury in mice to identify the repair pathway, finding that:

  • Silencing macrophage white blood cells through a process called ablation reduced the response level of Wnt proteins to injured kidney cells.
  • Deleting the Wnt7b protein from macrophages diminished normal tissue repair functions in injured kidneys.
  • Injecting into the injured kidneys a protein calked Dkk2, which is known to help regulate the Wnt pathway during embryonic development, enhanced the macrophage-Wnt7b repair process. This also restored epithelial surface cells that line internal kidney surfaces and suggested a therapeutic potential for the pathway.

Drs. Lang and Duffield said the repair pathway may benefit other injured organs because macrophages act somewhat like a universal emergency responder in the body, rushing to injured tissues wherever damage occurs. Another factor is the central role the Wnt pathway plays in cell regulation and function throughout the body.

Other collaborating institutions in the study include: the Department of Structural Biology, St, Jude Children's Hospital, Memphis, Tenn.; the departments of Internal Medicine and Molecular Biology, University of Texas Southwest Medical Center; Department of Molecular and Developmental Biology, Albert Einstein College of Medicine of Yeshiva University, Bronx, N.Y.; Department of Molecular and Cellular Biology, Harvard University; the Visual Systems Group in the division of Pediatric  Ophthalmology at Cincinnati Children's; and the Department of  Ophthalmology, University of Cincinnati.

Funding support came from the National Institutes of Health, the American Society of Nephrology Gottschalk Award, the Genzyme Renal Initiatives Program, a National Taiwan Merit Award, and the Abrahamson Pediatric Eye Institute Endowment at Cincinnati Children's.

http://www.cincinnatichildrens.org

SOURCE Cincinnati Children's Hospital Medical Center

RELATED LINKS
http://www.cincinnatichildrens.org

'/>"/>

SOURCE Cincinnati Children's Hospital Medical Center
Copyright©2010 PR Newswire.
All rights reserved

Related medicine news :

1. Prevention Is Key Research Goal for Premature Babies, Scientists Say
2. Scientists Discover How HIV Is Transmitted Between Men
3. Scientists Pinpoint Area of Brain That Fears Losing Money
4. Scientists Spot Genes Tied to Aging
5. UM School of Medicine scientists find new malaria vaccine is safe and promotes immune response in children
6. Scientists ID a protein that splices and dices genes
7. Breakthrough by Danish scientists in preventing maternal malaria
8. NIH scientists identify maternal and fetal genes that increase preterm birth risk
9. UM School of Medicine scientists find new malaria vaccine is safe and protective in children
10. Gladstone scientists identify target that may reduce complications of obesity
11. Scientists map out regulatory regions of genome, hot spots for diabetes genes
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/26/2016)... ... June 26, 2016 , ... Many women are ... with endometriosis. These women need a treatment plan to not only alleviate symptoms ... can help for preservation of fertility and ultimately achieving a pregnancy. The specialists ...
(Date:6/25/2016)... ... , ... First Choice Emergency Room , the largest network of independent ... Director of its new Mesquite-Samuell Farm facility. , “We are pleased to announce ... Dr. James M. Muzzarelli, Executive Medical Director of First Choice Emergency Room. , ...
(Date:6/24/2016)... ... June 24, 2016 , ... A recent article ... people are unfamiliar with. The article goes on to state that individuals are now ... of these less common operations such as calf and cheek reduction. The Los Angeles ...
(Date:6/24/2016)... ... June 24, 2016 , ... Global law firm Greenberg Traurig, P.A. announced that ... chosen by their peers for this recognition are considered among the top 2 percent ... special honors as members of this year’s Legal Elite Hall of Fame: Miami ...
(Date:6/24/2016)... Norcross, Georgia (PRWEB) , ... June 24, 2016 ... ... Year” awards today at the Clinical Decision Making in Emergency Medicine conference in ... who have authored journal articles published in Emergency Medicine Practice and ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... 24, 2016 ... the addition of the " Global Markets for ... This report focuses on ... updated review, including its applications in various applications. The ... which includes three main industries: pharmaceutical and biotechnology, food ...
(Date:6/24/2016)... 2016 Research and Markets has announced ... Diagnostic Tests" report to their offering. ... The World Market for Companion Diagnostics covers ... Market analysis in the report includes the following: ... Diagnostic Kits) by Region (N. America, EU, ROW), 2015-2020 ...
(Date:6/23/2016)... 2016  MedSource announced today that it has ... solution of choice.  This latest decision demonstrates MedSource,s ... their clients by offering a state-of-the-art electronic data ... nowEDC as the EDC platform of choice in ... "nowEDC has long been a preferred EDC platform ...
Breaking Medicine Technology: