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How do cells behave after being placed in a tissue culture environment?
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tissue culture
Tissue culture often requires sterile working conditions and thus is typically performed in a laminar flow cabinet (or tissue culture hood), which circulates filtered air to reduce the risk of culture contamination.
When cells are placed in a tissue culture environment, they are removed from the constraints of the organism, often allowing them to resume growth even if they had previously stopped dividing. Their behavior in this artificial setting includes several key processes:1
- Proliferation: Cells may multiply, often at a logarithmic rate, though this growth eventually slows as nutrients are exhausted or as the culture reaches density limits.12
- Functional Changes: Cells may change in size, form, or function. During rapid growth, they sometimes exhibit "despecialization," where they lose the specialized characteristics of their organ of origin, such as cartilage cells failing to synthesize matrix. However, some cells can maintain specialized activities, such as muscle cells continuing to contract.12
- Interaction and Inhibition: Cells can interact with one another. When a culture dish becomes densely packed, growth often slows due to "contact inhibition," where close physical contact between cells provides signals that retard further division.1
- Adaptation and Aging: Primary cultures may undergo replicative senescence after a certain number of generations (the Hayflick limit), whereas established cell lines may overcome these limits to replicate indefinitely.2
Researchers use these behaviors to study cell biology, metabolism, and the effects of external agents like drugs or viruses.2