Deconstructed Microfluidic Bone Marrow On-A-Chip to Study Normal and Malignant Hemopoietic Cell-Niche Interactions

Area of Science:

• Biomedical Engineering
• Stem Cell Biology
• Microfluidics

Background:

• Human hematopoietic stem and progenitor cells (HSPC) reside in specialized bone marrow (BM) niches.
• Understanding HSPC-niche interactions is crucial for hematopoiesis regulation.
• Current research heavily relies on animal models, limiting direct human relevance.

Purpose of the Study:

• To develop a human BM-on-a-chip model using microfluidics.
• To better mimic in vivo conditions, including 3D architecture, cell interactions, and circulation.
• To investigate dynamic interactions between normal and malignant HSPC and distinct BM niches.

Main Methods:

• Organ microengineering combined with microfluidics to create a human BM-on-a-chip.
• Integration of a recirculating perfusion system for dynamic culture.
• Development of a device with 4 distinct, integrated 3D tissue-engineered niche constructs.
• Incorporation of cell tracking technology for monitoring HSPC behavior.

Main Results:

• The BM-on-a-chip successfully recapitulated key aspects of the human BM microenvironment.
• The system enabled the identification and quantification of HSPC homing and retention.
• Preferential interactions of circulating normal and malignant HSPC with specific niches were observed.

Conclusions:

• The human BM-on-a-chip is a powerful tool for studying HSPC-niche dynamics.
• This model offers improved mimicry of in vivo human hematopoiesis.
• The technology facilitates the study of normal and malignant HSPC interactions within distinct microenvironments.