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A simple DNA-dependent fluorescence enhancement assay for cell number
Summary
A new DNA-based fluorescence assay quantifies cell numbers in cell lysates. This method is sensitive and works with crude cell samples, offering a reliable way to count cells.
Area of Science:
- Biotechnology
- Cell Biology
- Analytical Chemistry
Background:
- Accurate cell quantification is crucial for biological research.
- Existing methods can be complex or require purified samples.
Purpose of the Study:
- To develop a simple and sensitive assay for quantifying cell numbers in crude cell lysates.
- To utilize DNA-dependent fluorescence for cell enumeration.
Main Methods:
- Development of a DNA-dependent fluorescence enhancement assay.
- Utilized the dye Hoechst 33258 and a filter fluorometer.
- Tested assay sensitivity and linearity with common cell lines (L-929, BHK, CHO-Kl).
Main Results:
- The assay accurately quantifies cell numbers (1 x 10^4 to 2.5 x 10^5 cells) in crude detergent lysates.
- Demonstrated sensitivity sufficient for measuring as few as 1 x 10^4 cells.
- Showed linear fluorescence intensity response to cell number across tested ranges.
- Assay is robust against common contaminants like mercaptans, media, and proteins.
- Effective with freeze-thawed cell lysates.
Conclusions:
- A novel, sensitive, and robust fluorescence assay for cell number quantification in crude lysates was established.
- This method provides a straightforward approach for cell enumeration in various biological applications.
- The assay's reliability and simplicity make it suitable for routine laboratory use.