Improved separation of rhesus monkey lymphocytes with Percoll

Area of Science:

• Immunology
• Cell Biology
• Primate Research

Background:

• Peripheral blood mononuclear cells (PBMC) are crucial for immunological studies.
• Accurate isolation and characterization of PBMC subsets expressing specific markers (T4, T8, T11, Ia) are essential for research.
• Traditional isolation methods like Ficoll-Hypaque may impact cell marker expression.

Purpose of the Study:

• To compare the efficacy of polyvinyl pyrrolidone (Percoll) versus Ficoll-Hypaque for isolating Rhesus monkey PBMC.
• To evaluate the impact of isolation methods on PBMC yield, purity, and expression of immune markers (T4, T8, T11, Ia).

Main Methods:

• Density gradient centrifugation was used to isolate PBMC from Rhesus monkey peripheral blood.
• Two density gradient media were compared: Ficoll-Hypaque and Percoll (at density 1.077).
• PBMC yield, purity (erythrocyte and granulocyte contamination), and expression of T4, T8, T11, and Ia markers were quantified.

Main Results:

• Percoll (density 1.077) significantly increased the total yield and proportion of PBMC with detectable T4, T8, T11, and Ia markers compared to Ficoll-Hypaque.
• PBMC isolated with Percoll (density 1.077) exhibited lower erythrocyte (<1%) and granulocyte (<1%) contamination.
• Reduced marker expression with Ficoll-Hypaque suggests an effect on lymphocytes, not subpopulation loss, as confirmed by human PBMC experiments.

Conclusions:

• Percoll density gradient centrifugation is superior to Ficoll-Hypaque for isolating Rhesus monkey PBMC, preserving cell viability and marker integrity.
• The use of Percoll enhances the accuracy of immunological studies involving Rhesus monkey PBMC by providing higher yields and purer cell populations.
• Ficoll-Hypaque may adversely affect lymphocyte marker expression in non-human primates, necessitating careful method selection.