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Use of bidirectional blots in differential display analysis
D P Kestler1, M Hill, S Agarwal
1Graduate School of Medicine, University of Tennessee Medical Center at Knoxville, Knoxville, Tennessee, 37920, USA. dkestler@utk.edu
Analytical Biochemistry
|May 3, 2000
Summary
This study introduces a bidirectional blot method using SMART cDNA probes to efficiently screen gene expression changes in human umbilical vein endothelial cells (HUVECs). The technique accurately identifies modulated manganese superoxide dismutase (MnSOD) gene expression in response to inflammatory cytokines.
Area of Science:
- Molecular Biology
- Gene Expression Analysis
- Cell Biology
Background:
- Proinflammatory cytokines (IL1-beta, TNF-alpha, IL6) significantly impact human umbilical vein endothelial cell (HUVEC) gene expression.
- Accurate and efficient methods are needed to identify specific gene expression changes in response to these cytokines.
Purpose of the Study:
- To demonstrate the utility of a bidirectional transfer method combined with SMART (Streptavidin-Mediated Affinity-based) total cDNA complex probes for screening differential display arrays.
- To examine the expression of a manganese superoxide dismutase (MnSOD) cDNA fragment in HUVECs treated with proinflammatory cytokines.
Main Methods:
- Utilized bidirectional transfer methods and SMART total cDNA complex probes for sequential screening of differential display arrays.
- Performed parallel hybridization of bidirectional blots with (32)P-labeled SMART total cDNA probes from untreated and cytokine-treated HUVECs.
- Confirmed modulated expression and validated the screening method using Northern and total cDNA blot hybridization with the identified MnSOD cDNA fragment.
Main Results:
- Successfully detected a modulated manganese superoxide dismutase (MnSOD) cDNA fragment in HUVECs treated with IL1-beta, TNF-alpha, and IL6.
- Demonstrated that parallel hybridization with bidirectional blots clearly evaluates differential gene expression between cell treatments.
- Northern and total cDNA blot hybridization confirmed the modulated expression of the MnSOD gene and the efficacy of the bidirectional blot screening method.
Conclusions:
- Bidirectional blot analysis using SMART total cDNA probes enables direct evaluation of differential display bands from initial reamplification through plasmid insert cloning.
- This methodology enhances the ability to eliminate false-positive bands at each analysis step, improving the reliability of gene expression studies.
- The described technique is effective for examining the effects of proinflammatory cytokines on HUVEC gene expression, specifically identifying changes in MnSOD expression.