Wednesday, April 21, 2010

4/22 TE-RegenMed-StemCell feed

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Exciting(?) California Stem Cell News Upcoming
April 21, 2010 at 4:15 PM

Look for fresh items beginning tomorrow on the California Stem Cell Report. We have finished our obeisance to King Neptune with a four-night, nonstop, sleep-deprived passage from Mexico to El Salvador. We are now ensconced in a rustic marina at the mouth of the Estero de Jaltepeque after surfing over the bar this morning in our 39-foot home, the sailing vessel Hopalong.
 

Physics strategy tested as solution for antibiotic resistance
April 21, 2010 at 12:15 PM

 

Organotypic culture of human bone marrow adipose tissue.
April 21, 2010 at 6:56 AM

Related Articles

Organotypic culture of human bone marrow adipose tissue.

Pathol Int. 2010 Apr;60(4):259-67

Authors: Uchihashi K, Aoki S, Shigematsu M, Kamochi N, Sonoda E, Soejima H, Fukudome K, Sugihara H, Hotokebuchi T, Toda S

The precise role of bone marrow adipose tissue (BMAT) in the marrow remains unknown. The purpose of the present study was therefore to describe a novel method for studying BMAT using 3-D collagen gel culture of BMAT fragments, immunohistochemistry, ELISA and real-time reverse transcription-polymerase chain reaction. Mature adipocytes and CD45+ leukocytes were retained for >3 weeks. Bone marrow stromal cells (BMSC) including a small number of lipid-laden preadipocytes and CD44+/CD105+ mesenchymal stem cell (MSC)-like cells, developed from BMAT. Dexamethasone (10 micromol/L), but not insulin (20 mU/mL), significantly increased the number of preadipocytes. Dexamethasone and insulin also promoted leptin production and gene expression in BMAT. Adiponectin production by BMAT was <0.8 ng/mL under all culture conditions. Dexamethasone promoted adiponectin gene expression, while insulin inhibited it. This finding suggests that dexamethasone, but not insulin, may serv! e as a powerful adipogenic factor for BMAT, in which adiponectin protein secretion is normally very low, and that BMAT may exhibit a different phenotype from that of the visceral and subcutaneous adipose tissues. BMAT-osteoblast interactions were also examined, and it was found that osteoblasts inhibited the development of BMSC and reduced leptin production, while BMAT inhibited the growth and differentiation of osteoblasts. The present novel method proved to be useful for the study of BMAT biology.

PMID: 20403027 [PubMed - in process]

 

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