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´╗┐Rutland Herald

She had been employed over the years at Rutland Mental Health Rutland Industries, Proctor Elementary School as an aide to handicapped children, and Brandon American Legion Post 55.

Susan enjoyed puzzle books, reading, and painting ceramics, but most of all she loved animals, flowers and playing with babies.

She is survived by her mother and father of Pittsford; a daughter, Stephanie Baker of Rutland; a son, Eben Baker of Rutland; a sister, Patricia Daniels; her husband, Victor, of Brandon, Florida; a grandson, Hunter Baker; and nieces, nephews, aunts, uncles and cousins, all whom she loved very much.

A reception for family and friends will be held immediately after the service at the Pittsford Congregational Church Fellowship Hall.

For those who wish, memorial contributions in Susans memory may be made to the Rutland County Humane Society, 765 Stevens Road, Pittsford, VT 05763; or the Foley Cancer Center, 160 Allen Street, Rutland, VT 05701.

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´╗┐cell approach shows promise for Duchenne muscular dystrophy

CHAMPAIGN, lll. Researchers have shown that transplanting stem cells derived from normal mouse blood vessels into the hearts of mice that model the pathology associated with Duchenne muscular dystrophy DMD prevents the decrease in heart function associated with DMD.

Treatment with stem cells derived from blood vessels spurred nestinpositive stem cells already present in the heart to form new cardiac muscle cells see arrows. Photo by Suzanne BerryMiller

Duchenne muscular dystrophy is a genetic disorder caused by a mutation in the gene for dystrophin, a protein that anchors muscle cells in place when they contract. Without dystrophin, muscle contractions tear cell membranes, leading to cell death. The lost muscle cells must be regenerated, but in time, scar tissue replaces the muscle cells, causing the muscle weakness and heart problems typical of DMD. Centers for Disease Control and Prevention estimates that DMD affects one in every 3,500 males. The disease is more prevalent in males because the dystrophin mutation occurs on the X chromosome; males have one X and one Y chromosome, so a male with this mutation will have DMD, while females have two X chromosomes and must have the mutation on both of them to have the disease. Females with the mutation in one X chromosome sometimes develop muscle weakness and heart problems as well, and may pass the mutation on to their children.

Although medical advances have extended the lifespans of DMD patients from their teens or 20s into their early 30s, diseaserelated damage to the heart and diaphragm still limits their lifespan.

100 percent of patients develop dilated cardiomyopathy, in which a weakened heart with enlarged chambers prevents blood from being properly pumped throughout the body, said University of Illinois comparative biosciences professor Suzanne BerryMiller, who led the study. now, doctors are treating the symptoms of this heart problem by giving patients drugs to try to prolong heart function, but that can replace the lost or damaged cells, she said.

In the new study, the researchers injected stem cells known as aortaderived mesoangioblasts ADM into the hearts of dystrophindeficient mice that serve as a model for human DMD. The ADM stem cells have a working copy of the dystrophin gene.

This stem cell therapy prevented or delayed heart problems in mice that did not already show signs of the functional or structural defects typical of Duchenne muscular dystrophy, the researchers report.

BerryMiller and her colleagues do not yet know why the functional benefits occur, but proposed three potential mechanisms. They observed that some of the injected stem cells became new heart muscle cells that expressed the lacking dystrophin protein. The treatment also caused existing stem cells in the heart to divide and become new heart muscle cells, and the stem cells stimulated new blood vessel formation in the heart. It is not yet clear which of these effects is responsible for delaying the onset of cardiomyopathy, BerryMiller said.

vesselderived cells might be good candidates for therapy, but the more important thing is the results give us new potential therapeutic targets to study, which may be activated directly without the use of cells that are injected into the patient, such as the ADM in the current study, BerryMiller said. stem cells that are already present in the body to repair tissue would avoid the potential requirement to find a match between donors and recipients and potential rejection of the stem cells by the patients.

Despite the encouraging results that show that stem cells yield a functional benefit when administered before pathology arises in DMD mouse hearts, a decline in function was seen in mice that already showed the characteristics of dilated cardiomyopathy. One of these characteristics is the replacement of muscle tissue with connective tissue, known as fibrosis.

This difference may occur, BerryMiller said, as a result of stem cells landing in a pocket of fibrosis rather than in muscle tissue. The stem cells may then become fibroblasts that generate more connective tissue, increasing the amount of scarring and making heart function worse. This shows that the timing of stem cell insertion plays a crucial role in an increase in heart function in mice lacking the dystrophin protein.

She remains optimistic that these results provide a steppingstone toward new clinical targets for human DMD patients.

is the only study so far where a functional benefit has been observed from stem cells in the dystrophindeficient heart, or where endogenous stem cells in the heart have been observed to produce new muscle cells that replace those lost in DMD, so I think it opens up a new area to focus on in preclinical studies for DMD, BerryMiller said.