The selection of culture medium and operational details directly affect the growth status of human microvascular pericytes and the reliability of experimental results. The following are supplementary explanations of several key precautions:

1. Serum quality and batch stability

If using serum containing culture medium (such as DMEM with 10% FBS), it is necessary to ensure the reliability of the serum source and avoid contamination by mycoplasma or endotoxins. There may be differences in growth factors among different batches of serum. It is recommended to conduct batch testing in advance or choose serum-free culture medium to reduce variables.

2. Growth factor supplementation strategy

Pericytes are sensitive to growth factors such as PDGF-BB and bFGF, but excessive concentration may lead to excessive proliferation or differentiation deviation. It is recommended to determine the optimal addition ratio through pre experiments and regularly replace the freshly prepared culture medium (preferably every 2-3 days).

3. Oxygen tension regulation

Microvascular pericytes are exposed to a low oxygen microenvironment (1-5% O ₂) in vivo, and conventional culture chambers (21% O ₂) may trigger oxidative stress. Consider using a three gas incubator to simulate physiological oxygen conditions, or adding antioxidants to alleviate high oxygen damage.

4. Optimization of matrix coating

Cell adhesion depends on matrix proteins, and it is recommended to use collagen IV or fibronectin coated culture dishes, but attention should be paid to the coating concentration (usually 5-10 μ g/cm ²). Overcoating may alter the migration characteristics of cells.

5. Pollution risk prevention and control

Pericytes are susceptible to contamination by fibroblasts and can be regularly identified for purity through CD146 immunofluorescence or NG2 staining. If contamination is found, differential adhesion or flow separation can be attempted for purification.

6. Refinement of Passage Operations

It is recommended to use low concentration (0.05%) combined with brief incubation (2-3 minutes) during digestion, and promptly neutralize with serum containing culture medium. The passage ratio should be controlled between 1:2 and 1:3 to avoid aging caused by low cell density in a single passage.

7. Precautions for Freezing and Resuscitation

The freezing solution should contain 10% DMSO and high concentration serum (such as 90% FBS), and be stored in liquid nitrogen after program cooling. The fluid change after resuscitation should be completed within 24 hours to remove residual DMSO.

By controlling the above details, the repeatability and accuracy of functional research data in peri cell culture can be significantly improved. In subsequent experiments such as co culture or angiogenesis model construction, it is recommended to simultaneously detect markers such as α - SMA and Desmin to confirm cell phenotype stability.