Lymphoid immunohistochemistry of macaque primates

Area of Science:

• Immunology
• Primate research
• Histopathology

Background:

• Monoclonal antibodies (mAbs) are crucial for understanding immune cell populations and functions.
• Investigating cross-reactivity of human-specific mAbs in non-human primates is essential for translational research.
• Macaque models are widely used in biomedical research, necessitating tools for their immune system analysis.

Purpose of the Study:

• To determine the immunohistochemical cross-reactivity of 53 human lymphoid tissue-specific monoclonal antibodies in macaque lymph nodes.
• To compare the micro-anatomic distribution and antigen densities of these markers between macaques and humans.
• To establish a validated monoclonal antibody panel for immunopathological studies in macaques.

Main Methods:

• Immunohistochemistry using immunoperoxidase techniques on lymph node tissues from Macaca mulatta, M. speciosa, and M. fascicularis.
• Screening of 53 monoclonal antibodies.
• Automated flow cytometry analysis of peripheral blood from M. mulatta and M. speciosa.

Main Results:

• Thirty of the 53 monoclonal antibodies exhibited cross-reactivity in macaque lymph nodes.
• The micro-anatomic distribution and antigen densities of the cross-reactive antigens were highly homologous to human patterns.
• OKT11 (CD2) was the only pan-T antibody showing cross-reactivity; detailed immunocyto-architecture of rhesus lymph nodes was analyzed.
• Flow cytometry revealed broadly similar peripheral blood patterns between macaques and humans.

Conclusions:

• A panel of 30 monoclonal antibodies has been defined as useful for immunopathological investigations in macaques.
• The study demonstrates significant homology in lymphoid tissue antigen expression between macaques and humans.
• These findings support the use of macaques as relevant models for human immune system research.