Identifier

etd-07142009-134947

Degree

Master of Science (MS)

Department

Animal Science (Animal, Dairy, and Poultry Sciences)

Document Type

Thesis

Abstract

Since the cloning of Dolly there has been little change in the efficiency of nuclear transfer (NT). Research is beginning to investigate the characteristics of donor cells. Adiposetissue is an abundant source of adult-derived cells that have displayed “stemness” in-vitro(Gimble et al., 2003). The overall goal of this research was to define the in-vitro characteristicsof bovine adipose-derived adult stem cells (ADAS) for the use in NT. Isolation methods weredetermined by a 3 x 3 factorial design. 1 g of subcutaneous fat was collected and subjected to0.10%, 0.25% or 0.50% collagenase type I solution for 1, 2 and 3 h. Nucleated cells werecounted using heochst stain. There was no significant difference (P>0.05) in number of nucleated cells released during the incubation period or collagenase concentrations. Viable cells were determined by those that remained adherent 24 h post plating. Incubation in 0.25% collagenase for 2 h had the consistently highest percentage of viable cells (45%). The lifespan and growth characteristics were determined by in a 2 x 2 factorial experiment of DMEM or DMEM:F12 supplemented or not supplemented with growth factors. DMEM with growth factors supplementation was significantly shorter lifespan (P>0.05) than DMEM:F12. The averagelifespan was ~30 population doublings (PDs), with 1 cell cycle every two days until passage 8(P8). Two bovine ADAS cell lines were differentiated into adipocytes, chondrocytes and osteoblasts at middle and late passages along side of adult derived skin fibroblasts. Differentiation was confirmed by histological staining resulting in early passage ADAS cells staining more intensely compared to late passage ADAS cells and skin fibroblasts. Global levels of DNA methylation and histone acetylation were analyzed from P1 to P6 in ADAS and skin fibroblasts from three animals. There was no significant difference (P>0.05) between cell types for DNA methylation or histone acetylation. The percentage of cleaved and developing blastocyst embryos from the ADAS cells (62% and 8%) and skin fibroblasts cells (42% and 8%)were not different (P>0.05). Interspecies nuclear transfer utilized eland ADAS cells into enucleated bovine oocytes. A total of 3 interspecies embryos (1%) developed to blastocyst.

Date

2009

Document Availability at the Time of Submission

Release the entire work immediately for access worldwide.

Committee Chair

Bondioli, Keneth

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