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Influence of albumin on granulocyte and macrophage colony-forming efficiency
Y Iizuka1, T Oshima, M J Murphy
1Hipple Cancer Research Center, Dayton, Ohio.
Abstract:
Mouse granulocyte and macrophage precursors were assayed in plasma clot and fibrin clot cultures, and the effect of bovine serum albumin (BSA) on colony formation was investigated. The number of granulocyte colonies (CFU-g) and clusters increased as the albumin concentration was increased and the number of macrophage colonies (CFU-m) and clusters concomitantly decreased. The albumin-mediated suppression of macrophage colony formation was overcome by the addition of more than 10% fetal bovine serum (FBS) to the plasma clot culture. The effect of BSA and fatty-acid-free BSA on colony-forming efficiency was also tested in fibrin clot cultures containing 10% FBS. Both BSA and fatty-acid-free BSA at a final concentration of 0.5-2% enhanced CFU-g colony formation, while both forms of BSA reduced the number of CFU-m colonies. However, neither BSA nor fatty-acid-free BSA had any effect on colony formation in FBS-free fibrin clot cultures, and only BSA enhanced colony formation when transferrin, linoleic acid, alpha-thioglycerol and dextran were added to the culture. The number of CFU-g (15.6 +/- 3.1) was higher in cultures containing BSA, transferrin, etc., than the number (9.8 +/- 2.5) in cultures without BSA and including transferrin, etc., than the number (9.8 +/- 2.5) in cultures without BSA and including transferrin, etc. (p less than 0.01). The number of CFU-m (32.0 +/- 6.8) in cultures containing BSA and the other four factors was lower than the number (72.2 +/- 5.6) in the culture without BSA (p less than 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)
Insights
Bovine serum albumin (BSA) influences mouse hematopoietic stem cell cultures. BSA enhances granulocyte colony formation but suppresses macrophage colony formation, effects modulated by fetal bovine serum and other culture factors.
Area of Science:
- Hematology
- Stem Cell Biology
Background:
- Hematopoietic stem cell (HSC) culture requires specific media components for optimal progenitor growth.
- Bovine serum albumin (BSA) is a common supplement, but its precise effects on distinct myeloid lineages are not fully elucidated.
Purpose of the Study:
- To investigate the impact of BSA on the colony-forming efficiency of mouse granulocyte-macrophage progenitors (GMPs).
- To determine how BSA affects colony formation in different culture conditions and in combination with other supplements.
Main Methods:
- Assay of mouse GMPs in plasma clot and fibrin clot cultures.
- Culturing with varying concentrations of BSA and fetal bovine serum (FBS).
- Testing BSA and fatty-acid-free BSA in fibrin clot cultures with or without additional factors (transferrin, linoleic acid, alpha-thioglycerol, dextran).
Main Results:
- BSA dose-dependently increased granulocyte colony formation (CFU-g) while decreasing macrophage colony formation (CFU-m).
- Macrophage suppression by BSA was reversed by >10% FBS in plasma clot cultures.
- BSA and fatty-acid-free BSA enhanced CFU-g and suppressed CFU-m in fibrin clot cultures with 10% FBS.
- BSA enhanced CFU-g only when specific factors including transferrin were present in FBS-free fibrin cultures.
Conclusions:
- BSA differentially regulates granulocyte and macrophage progenitor proliferation.
- The effects of BSA are context-dependent, influenced by FBS concentration and the presence of other specific culture supplements.
- BSA's role in HSC culture warrants careful consideration of the overall media composition.