Related Experiment Videos
[Clonogenic hemopoietic cells (CFU-S) in mouse pre- and postnatal ontogeny]
Insights
This study tracked mouse hematopoietic stem cell populations (CFU-S-7, CFU-S-11, CFU-S-ep) from embryonic to adult stages. Findings reveal distinct changes in cell ratios, reflecting the developing hematopoietic system's functional state.
Area of Science:
- Hematology
- Developmental Biology
- Stem Cell Biology
Background:
- Hematopoiesis is a complex process involving various stem cell populations.
- Understanding the ontogeny of hematopoietic stem cells (HSCs) is crucial for comprehending immune system development and function.
- Clonogenic assays are vital for quantifying HSC populations and assessing their functional potential.
Purpose of the Study:
- To investigate the developmental trajectory of three distinct clonogenic hematopoietic cell populations (CFU-S-7, CFU-S-11, and CFU-S-ep) in mice.
- To analyze the distribution and relative abundance of these cell types in major hematopoietic organs (liver, spleen, bone marrow) throughout embryogenesis and postnatal life.
- To correlate changes in the composition of the CFU-S compartment with the functional maturation of the hematopoietic system.
Main Methods:
- Longitudinal study design tracking mice from embryonic day 10 to 18 months of age.
- Quantification of CFU-S-7, CFU-S-11, and CFU-S-ep using limiting dilution assays in spleen colony formation assays.
- Analysis of cell content in liver, spleen, and bone marrow at multiple time points.
Main Results:
- CFU-S-7 and CFU-S-11 cells, forming large colonies, were consistently detected in the liver, spleen, and bone marrow across all developmental stages studied.
- The concentration and ratio of CFU-S-7 to CFU-S-11 cells exhibited dynamic changes within these hematopoietic organs during development.
- CFU-S-ep cells, forming small colonies, were present in the liver and spleen during embryonic development and early postnatal life but were largely absent in older animals.
Conclusions:
- The hematopoietic stem cell compartment is composed of distinct subpopulations with unique developmental kinetics.
- The observed changes in the relative proportions of CFU-S subpopulations reflect the functional maturation and adaptation of the hematopoietic system during ontogeny.
- The differential presence and abundance of CFU-S-7, CFU-S-11, and CFU-S-ep provide insights into the regulatory mechanisms governing hematopoietic stem cell development.
Abstract:
Content of three classes of clonogenic haemopoietic cells (CFU-S-7, CFU-S-11 and CFU-S-ep) was determined in haemopoietic organs of mouse during embryogenesis (10, 14 and 18 day) and postnatal ontogenesis (2, 3 and 7 day, 1, 2, 3 and 18 month). CFU-S-7 and CFU-S-11 that from big splenic colonies on 7th and 11th days of transplantation are present in liver, spleen and bone marrow at all developmental stages. However their concentration and CFU-S-7 CFU-S-11 ratio change in haemopoietic organs. CFU-S-ep that form small colonies on 11th day are observed before birth in liver and spleen and 1 week after birth there and also in bone marrow but are practically absent from haemopoietic organs of older animals. Thus, CFU-S compartment structure is characterized by definite ratio of its subpopulations. It seems to reflect functional state of haemopoietic system during development.