Continuous long-term culture of human bone marrow

Area of Science:

• Hematology
• Cell Biology
• Stem Cell Research

Background:

• Long-term liquid culture systems are crucial for studying hematopoiesis and bone marrow microenvironment.
• Understanding the cellular composition and maintenance of bone marrow cultures is essential for research.

Purpose of the Study:

• To establish and characterize a long-term liquid culture system for human bone marrow.
• To investigate the role of hydrocortisone and serum composition on cell growth and differentiation.
• To evaluate the maintenance of myeloid precursors and stromal cells in culture.

Main Methods:

• Human bone marrow was cultured in alpha medium supplemented with hydrocortisone and a mixture of horse and fetal calf serum.
• A long-term liquid culture system was employed to assess cell adherence and non-adherent cell populations.
• Cellular composition of adherent and non-adherent layers was analyzed over a 12-week period.

Main Results:

• An adherent layer formed, containing fat cells, macrophages, fibroblast-like, and epithelioid cells.
• The adherent layer supported myeloid cells and their precursors.
• Non-adherent cells included immature myeloid elements and mature macrophages/granulocytes, maintained for up to 12 weeks.
• Mixed sera were superior to individual sera types for successful culture.
• Early growth of hydrocortisone-dependent fat cells was observed in the adherent layer.

Conclusions:

• A robust long-term liquid culture system for human bone marrow was established.
• The system supports the sustained growth of myeloid precursors and stromal elements, including hydrocortisone-dependent fat cells.
• This model provides a valuable tool for investigating hematopoiesis and bone marrow biology.