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Influence of pH and serum on the effectivity of antineoplastic agents in vitro
Abstract:
pH and serum are important factors in cell cultures in vitro. Only 47.4% of 3H-uridine incorporation were measured in cells incubated with medium pH 6.8 in comparison to control cultures (mesothelioma cells, 30th passage; pH 7.4; 3H-uridine incorporation 100%). Changes of pH can also influence the cytotoxic activity of 5-Fluorouracil (2.9 X 10(-4) M). We measured greater inhibition of 3H-uridine incorporation with medium pH 6.8 (79.9%) in comparison to medium pH 7.4 (54.0%). Influence of serum (10%) on the cytotoxicity of Viknblastine (7.4 X 10(-9)M) were measured. Foetal calf serum (FS 883) and calf serum (KS 132) showed similar effects on the inhibition of 3H-thymidine incorporation, 78.1% and 87.4% respectively. But calf serum (KS 199) supplemented medium produced only 40.6% inhibition of disintegrations/microgram DNA. The possible factors (pH, osmotic activity, protein distribution) of these sera will be discussed.
Insights
Altering the pH of cell culture media significantly impacts cellular processes like 3H-uridine incorporation and drug efficacy. Variations in serum composition also affect drug cytotoxicity, highlighting the need for careful optimization in in vitro studies.
Area of Science:
- Cell Biology
- Biochemistry
- Pharmacology
Background:
- In vitro cell culture relies on precise media conditions.
- pH and serum components are critical variables affecting cellular responses.
- Understanding these factors is crucial for accurate experimental outcomes.
Purpose of the Study:
- To investigate the impact of medium pH on 3H-uridine incorporation in mesothelioma cells.
- To assess how pH influences the cytotoxic activity of 5-Fluorouracil.
- To evaluate the effect of different serum batches on the cytotoxicity of Vinblastine.
Main Methods:
- Cell cultures (mesothelioma, 30th passage) were incubated at pH 6.8 and pH 7.4.
- 3H-uridine incorporation was measured to assess cellular activity.
- Cytotoxic effects of 5-Fluorouracil and Vinblastine were quantified using 3H-thymidine incorporation and DNA disintegration assays.
Main Results:
- Reduced 3H-uridine incorporation (47.4%) observed at pH 6.8 compared to pH 7.4 (100%).
- Medium pH 6.8 enhanced 5-Fluorouracil's inhibition of 3H-uridine incorporation (79.9%) versus pH 7.4 (54.0%).
- Foetal calf serum (FS 883) and one calf serum (KS 132) showed comparable Vinblastine cytotoxicity inhibition (78.1%, 87.4%), while another calf serum (KS 199) showed lower inhibition (40.6%).
Conclusions:
- Medium pH is a critical determinant of cellular metabolic activity and drug response in vitro.
- Serum variability significantly influences drug cytotoxicity, necessitating careful selection and characterization.
- Factors like pH, osmotic activity, and protein distribution in sera require further investigation.