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Cell line culture

Cell line culture is an important technique in cell biology and biotechnology, referring to the long-term maintenance and propagation of a specific type of cell isolated from an organism under in vitro conditions. Cell lines typically originate from primary cultures; after selection and serial passaging, they can grow indefinitely or under limited conditions in vitro. The following are some basic steps and key considerations for cell line culture:

 

Basic steps:

 

Primary culture : Cells are isolated from the tissue and subjected to primary culture to obtain an adequate cell yield.

Cell passage When primary cells reach a certain confluence, they are diluted and replated in new culture vessels to initiate passage culture.

Selection and purification : Specific cell types are selected using specialized selection media or drugs.

Expand cultivation : The selected cells are expanded in culture to meet experimental or production requirements.

Cryopreservation : Freeze the cells in liquid nitrogen for future use.

Recovery : Remove the cells from liquid nitrogen, rapidly thaw them, and re‑culture.

 

Precautions:

 

  • Aseptic technique : Strict aseptic techniques are required during cell culture to prevent contamination.

  • Culture medium : Select an appropriate culture medium, which typically contains glucose, amino acids, vitamins, minerals, and serum, among other components.

  • Environmental Control Cell culture requires a constant temperature (typically 37°C), an appropriate CO2 concentration (usually 5%), and adequate humidity.

  • Cell density : Maintain an appropriate cell seeding density to prevent overcrowding, which can lead to growth inhibition.

  • Regular inspection : Regularly monitor cell growth and promptly detect contamination or changes in cell condition.

  • Cell identification : Regularly perform characterization of cell lines, including morphological analysis, assessment of growth characteristics, and karyotype analysis, to ensure cell purity and stability.

 

Applications: Cell line culture is widely used in basic research, drug screening, vaccine production, and studies of gene function. For example, tumor cell lines are commonly employed in cancer research, while normal cell lines are utilized to investigate fundamental questions in cell biology.