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Correct stem cell function requires hydrogen sulfide.

LOS ANGELES, Calif., April 17, 2014 -- Stem cells in bone marrow need to produce hydrogen sulfide in order to properly multiply and form bone tissue, according to a new study.

Songtao Shi of the Center for Craniofacial Molecular Biology at the Ostrow School of Dentistry, principal investigator on the project, said the presence of hydrogen sulfide produced by the cells governs the flow of calcium ions. The essential ions activate a chain of cellular signals that results in osteogenesis, or the creation of new bone tissue, and keeps the breakdown of old bone tissue at a proper level.

Conversely, having a hydrogen sulfide deficiency disrupted bone homeostasis and resulted in a condition similar to osteoporosis--weakened, brittle bones--in experimental mice. In humans, osteoporosis can cause serious problems such as bone fractures, mobility limitations and spinal problems; more than 52 million Americans have or are at risk for the disease.

However, the team demonstrated that the mice's condition could be rescued by administering small molecules that release hydrogen sulfide inside the body. The results indicate that a similar treatment may have potential to help human patients.

"These results demonstrate hydrogen sulfide regulates bone marrow mesenchymal stem cells, and restoring hydrogen sulfide levels via non-toxic donors may provide treatments for diseases such as osteoporosis, which can arise from hydrogen sulfide deficiencies," Shi said.

Citation: "Hydrogen Sulfide Maintains Mesenchymal Stem Cell Function and Bone Homeostasis via Regulation of Ca2 Channel Sulfhydration"; Yi Liu et al.; Cell Stem Cell, 2014; DOI: 10.1016/j.stcm.2014.03.005

http://dx.doi.org/10.1016/j.stem.2014.03.005

Contact: Songtao Shi, songtaos@usc.edu

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Title Annotation:Basic Research
Publication:Stem Cell Research News
Date:Apr 28, 2014
Words:270
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