Advanced Immune Cell Profiling by Multiparameter Flow Cytometry in Humanized Patient-Derived Tumor Mice

Area of Science:

• Immunology
• Oncology
• Preclinical Models

Background:

• Humanized mice are crucial preclinical models for cancer research.
• Standardizing immune cell phenotyping is vital for analyzing immune responses in cancer.
• Humanized patient-derived xenograft (hPDX) models combine human immune systems with patient tumors.

Purpose of the Study:

• To apply established immune cell profiling protocols to hPDX models.
• To characterize immune cell patterns in hPDX models.
• To assess the impact of CD34+ stem cell transplantation on immune reconstitution.

Main Methods:

• Utilized established protocols for multicolor immune cell profiling via flow cytometry.
• Transplanted CD34+ stem cells into mice to create hPDX models.
• Analyzed T and B cell differentiation, regulatory T cells (Tregs), and exhausted T cells.

Main Results:

• Immune reconstitution levels were independent of transplanted CD34+ cell quantity.
• Low-level CD3+ cell contamination in HSC transplants did not impair T cell maturation.
• Identified diverse B and T cell differentiation stages, including Tregs and exhausted T cells expressing TIGIT, PD-1, or KLRG1.

Conclusions:

• Standardized flow cytometry protocols are effective for immune cell characterization in hPDX models.
• This methodology enhances the understanding of immune-oncologic processes.
• hPDX models with standardized profiling offer valuable insights into human cancer progression.