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Prostatic tissue protein alterations due to delayed time to freezing
David Jackson1, Rachel A Rowlinson, Cassie K Eaton
1Pathways, DECS, AstraZeneca, Alderley Park, Cheshire SK10 4TG, UK. David.H.Jackson@astrazeneca.com
Proteomics
|June 13, 2006
Summary
Fresh tissue samples stored on ice before freezing show minimal protein degradation within 30 minutes. Longer delays cause subtle changes, emphasizing rapid processing for accurate prostatic tissue analysis.
Area of Science:
- Biochemistry
- Proteomics
- Cancer Research
Background:
- Clinical studies generate fresh tissue samples crucial for analysis.
- Immediate snap-freezing is ideal but often impractical, leading to storage on ice.
- Delays in freezing can cause endogenous protein degradation, impacting results.
Purpose of the Study:
- To investigate the impact of time-to-freezing delays on prostatic tissue protein profiles.
- To assess the type and extent of protein degradation caused by delayed freezing.
- To determine the threshold for acceptable processing times in prostatic tissue analysis.
Main Methods:
- Utilized fluorescence 2-D Difference Gel Electrophoresis (DIGE) for protein analysis.
- Examined protein degradation in prostate carcinoma-3 (PC-3) cell lines, xenografts, and canine prostate tissues.
- Varied the time interval between tissue collection and freezing.
Main Results:
- A 30-minute processing time exhibited minimal impact on the overall protein profile.
- Longer delays showed little visible degradation, but subtle alterations accumulated over time.
- Protein degradation effects were observable with extended delays, though not drastically altering the 2-D gel spot pattern.
Conclusions:
- Rapid tissue processing is recommended to minimize potential protein degradation.
- Short processing times (e.g., 30 minutes) do not significantly perturb prostatic tissue 2-D gel profiles.
- The study supports current practices of prompt sample handling in clinical research.