미국의 과학자들이 젊은 쥐의 피를 늙은 쥐에서 수혈해 심장 질환의 일부인 심근비대를 고쳤다고 밝혔다.
하버드 줄기세포 기관 (Harvard Stem Cell Institute)와 브리검앤워먼스 병원(Brigham and Women's Hospital)의 연구진은 쥐들의 신체에서 심근비대를 유발하는 원인이 무엇인지 밝히는 실험을 진행했다. 심근비대(myocardial hypertrophy)란 심근섬유가 비대한 결과, 심중량의 증가, 심실벽이 비후(肥厚)된 상태를 가리킨다.
연구진이 밝혀낸 바에 따르면 이러한 작용은 GFD-11이라는 호르몬과 관련이 있다고 한다.
연구진은 먼저 젊은 쥐와 늙은 쥐의 혈관을 이용해 젊은 쥐의 혈액이 늙은 쥐에게로 주입되도록 했다. 그리고 그 과정을 지켜본 결과 4주만에 심근섬유가 비대해지는 현상이 눈에 띄게 반전되었다고 한다.
검사 결과 늙은 쥐의 혈액에서는 시술 전에 GFD-11의 수치가 상당히 낮았던 것으로 드러났다.
연구진은 GFD-11의 효과를 확신하기 위해 늙은 쥐에 호르몬을 직접 주입했는데, 그 결과 쥐의 심장상태가 눈에 띄게 호전되었다고 한다.
연구에 참여한 리처드 리는 그의 팀이 이러한 치료효과가 인간에게도 적용되는지 여부를 조사하고 있다고 밝혔다. GFD-11는 인간의 혈액 속에도 존재하지만 쥐와 같은 식으로 작용하는지 여부는 명확하지 않다.
이번 연구는 생물학전문지 셀(Cell)의 최신호에 실렸다. (코리아헤럴드)
<관련 영문 기사>
Hormone that reverses age-related heart failure found: scientists
U.S. scientists recently announced that they may have found a hormone that reverses age-related heart failure.
Scientists from Harvard Stem Cell Institute and Harvard-affiliated Brigham and Women‘s Hospital conducted a study to pinpoint which hormone affected the thickening of cardiac muscles in mice as they age.
This condition is called myocardial hypertrophy and it causes tightening of heart chambers, making blood circulation more difficult. Known to also occur in humans, this can result in heart failure.
According to the researchers, the diminishing level of a growth hormone called GFD-11 may be potentially responsible for the thickening process.
The research team swapped blood between young and old mice and monitored the progress. They found within four weeks of the blood swap, the thickening heart issue found in older mice was significantly reversed.
Blood analysis showed that GFD-11 levels were much lower in older mice, indicating the hormone played a critical role in keeping the heart healthy.
The team then conducted a second study where they directly injected GFD-11 into the older mice. After the injection, heart conditions of the old mice improved.
The study’s senior author Richard Lee said his team is hoping to find out if the same process can also be applied to humans. GDF-11 exists in human blood, but it is unclear if it works in same way as the mice.
The study was published Thursday in the journal Cell.
From news reports
(khnews@heraldcorp.com)
Hormone that reverses age-related heart failure found: scientists
U.S. scientists recently announced that they may have found a hormone that reverses age-related heart failure.
Scientists from Harvard Stem Cell Institute and Harvard-affiliated Brigham and Women‘s Hospital conducted a study to pinpoint which hormone affected the thickening of cardiac muscles in mice as they age.
This condition is called myocardial hypertrophy and it causes tightening of heart chambers, making blood circulation more difficult. Known to also occur in humans, this can result in heart failure.
According to the researchers, the diminishing level of a growth hormone called GFD-11 may be potentially responsible for the thickening process.
The research team swapped blood between young and old mice and monitored the progress. They found within four weeks of the blood swap, the thickening heart issue found in older mice was significantly reversed.
Blood analysis showed that GFD-11 levels were much lower in older mice, indicating the hormone played a critical role in keeping the heart healthy.
The team then conducted a second study where they directly injected GFD-11 into the older mice. After the injection, heart conditions of the old mice improved.
The study’s senior author Richard Lee said his team is hoping to find out if the same process can also be applied to humans. GDF-11 exists in human blood, but it is unclear if it works in same way as the mice.
The study was published Thursday in the journal Cell.
From news reports
(khnews@heraldcorp.com)