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Scientists find potential protein biomarkers for growth hormone
Date:6/17/2008

SAN FRANCISCO Ohio University scientists have identified several proteins in mice that might act as biomarkers for growth hormone. The research could be the first step to finding a more reliable way to detect recombinant human growth hormone (rhGH), which some athletes and teenagers use illegally to boost muscle and reduce fat.

At the Endocrine Society annual meeting in San Francisco today, scientists John Kopchick and Juan Ding presented a new study that pinpointed four proteins that significantly decreased or increased in the blood after exposure to bovine growth hormone, which is similar to human growth hormone.

The researchers injected six 6-month-old male mice with growth hormone for seven days. They studied blood samples from the mice and compared the results to six control animals. Kopchick and Ding scanned hundreds of plasma proteins and found four apoA1, transthyretin, clusterin and albumin that showed a strong reaction to growth hormone.

"They're in the blood, but we don't know if they're coming from liver, fat, muscle or the kidneys," said Kopchick, Goll-Ohio Professor of Molecular Biology with Ohio University's Edison Biotechnology Institute and College of Osteopathic Medicine.

Kopchick and Ding, a graduate student in biological sciences, are hopeful that the proteins could be viable biomarkers for growth hormone activity in humans as well.

"In mice we can control the variables and the environment, but humans are genetically diverse and have different lifestyles that impact growth hormone. So the results may point to future study in humans, but may not necessarily apply to humans yet," said Ding, who also is studying how to identify protein biomarkers for human aging.

Growth hormone is hard to detect because it has a serum half life of only 15 minutes. RhGH, an approved drug for individuals with growth hormone deficiency, also is identical to human growth hormone. The current method o
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Contact: Andrea Gibson
gibsona@ohio.edu
740-597-2166
Ohio University
Source:Eurekalert

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