| Insulin-like growth factor-I in growing horses and RNA isolation from small articular cartilage samples | |
Abstract/OtherAbstract
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A longitudinal study was designed to characterize developmental patterns of plasma (PL) and synovial fluid (SF) total insulin-like growth factor-I (IGF-I) concentrations, as well as their association with measurements of skeletal growth in Thoroughbred horses. Horses were randomly assigned to one of two dietary treatment groups and fed diets with either a high or low starch content to examine the effects of dietary energy source on PL and SF IGF-I. At 3, 6, 9, 12 and 15 mo of age, PL and carpal SF samples were collected for analysis of total IGF-I. Body weight gain, wither height gain and forearm length gain were calculated for the 90 day periods between SF and PL sampling. No influence of diet on PL or SF IGF-I was detected (P > 0.05). Average SF IGF-I concentrations were 30.1 ± 1.8% of that found in PL, and PL and SF IGF-I were positively correlated (r = 0.48, P = 0.0003) There was an effect of month of age on both PL and SF IGF-I concentrations (P < 0.05). There was a positive correlation between all measures of gain except forearm length gain with PL and SF IGF-I (r = 0.41 to 0.55, P < 0.05). In our second study, we evaluated the use of a liquid-nitrogen cooled mortar and pestle, motorized freezer mill and rotor-stator homogenizer for homogenization of small (<50mg) articular cartilage samples. The rotor-stator homogenizer produced quanitfiable RNA yields, and was used to evaluate three different RNA isolation protocols. Two of the protocols were commercially available RNA extraction kits, with the third a modified guanidinium isothiocyanate/acid-phenol extraction procedure. The combined average yield for all protocols was 91.9 ng RNA/mg of cartilage. All protocols yielded a sufficient quantity of quality RNA suitable for gene expression analysis. |
Authors
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Cosden, Rebekah Stacey |
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Contributors
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Jolynne Tschetter, W. Burton Staniar, Ray J. Geor, Ed Smith, Mark Crisman |
Publication Detail
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Publisher : VT Type : text Format : application/pdf |
Date Detail
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2007-10-16 |
Subject
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Animal and Poultry Sciences |
Coverage
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- |
Relation
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- |
Source
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http://scholar.lib.vt.edu/theses/available/etd-08222007-131832/ |
Copyright Information
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unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
Other Details
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Languages : en |
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