Related Experiment Videos
[An improved colorimetric assay for chicken M-CSF like activity using chicken bone marrow cells cultured on
1Department of Microbiology and Immunology, Nippon Medical School, Tokyo, Japan.
Abstract:
The role of M-CSF in the process of mammalian development has been drawing attention. Unlike mammalian embryonic development, in which M-CSF is supplied by the maternal body, avian embryonic development begins and proceeds under the influence of a certain amount of M-CSF present in each fertilized egg, and its concentration can be experimentally controlled while observing the embryo's developmental state. Apart from this fact, aves provide us with many other advantages in the study of embryonic development. It is, however, not easy to separate multipotent hematopoietic stem-cell fractions from avian bone marrow. In addition, because a macrophage colony forming assay in soft agar, though it has been widely used, requires a large number of cells and a long culture period, the method of assay is not adequate for the sensitive detection of M-CSF activity in small scale samples. We have established a method for the depletion of nucleated erythrocytes from chicken bone marrow cell suspensions using percoll density gradient centrifugation, and have also developed a new method for determining chicken M-CSF-like activity employing a liquid culture. In this method, a 100 microliters aliquot of fractionated hematopoietic stem cells, 1 x 10(5), was placed in a well of 96-well flat-bottom culture plate, 100 microliters of sample was then added to each well, and the uptake of neutral red was measured after 4 days of culture. These procedures represent a simple and sensitive means of detecting M-CSF-like activity in chicken serum of x60 to x32 dilutions.(ABSTRACT TRUNCATED AT 250 WORDS)
Insights
Researchers developed a new, sensitive liquid culture method to detect macrophage colony-stimulating factor (M-CSF)-like activity in avian serum. This technique simplifies M-CSF analysis in avian embryonic development studies.
Area of Science:
- Developmental Biology
- Hematopoiesis
- Immunology
Context:
- Macrophage colony-stimulating factor (M-CSF) plays a crucial role in mammalian development.
- Avian embryos offer unique advantages for studying M-CSF's developmental influence due to controllable M-CSF levels.
- Existing methods for M-CSF detection in avian systems are often inefficient and require large cell quantities.
Purpose:
- To establish a simplified and sensitive assay for detecting M-CSF-like activity in avian serum.
- To overcome limitations of current M-CSF detection methods in avian bone marrow stem cell research.
- To facilitate the study of M-CSF's role in avian embryonic development.
Summary:
- A novel liquid culture method was developed for quantifying chicken M-CSF-like activity.
- The method involves fractionating hematopoietic stem cells and measuring neutral red uptake after 4 days.
- This technique allows for sensitive detection of M-CSF activity in diluted chicken serum samples.
Impact:
- Provides a simple, sensitive, and efficient tool for M-CSF activity assessment in avian research.
- Enables further investigation into the role of M-CSF in avian embryonic development and hematopoiesis.
- Potentially applicable to other avian species and M-CSF related research areas.