1.11: Chapter Summary
- Page ID
- 222897
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Cell culture maintains living cells outside their original organism. It allows focused experiments, but a culture represents only selected parts of a living system. Primary cultures begin with cells collected from a biological source. Cell lines are maintained by subculture and can have finite or continuous growth potential. Cell strains are selected populations with particular properties. Adherent cells attach to a surface, while suspension cells grow dispersed in medium. Culture origin, growth potential, and growth pattern are separate features. MSCs, THP-1 cells, and N DFs provide models of different cell behaviors and functions. Knowing their expected behavior helps guide observation and interpretation. Reliable conclusions require appropriate comparisons, suitable measurements, and complete records. A change in appearance can suggest a question, but additional evidence is needed to explain its cause. Choose a culture by considering its source, division li its, and growth pattern together. These features guide maintenance and help explain changes. Suitable controls connect observations to supported conclusions. The history of cell culture also shows why research must respect tissue donors. Accurate identification and records preserve a model’s usefulness and its biological history.
Key Terms
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Cell culture |
in vitro |
in vivo |
cell |
|
tissue |
organ |
tissue culture |
organ culture |
|
primary culture |
subculture |
passaging |
cell line |
|
finite cell line |
senescence |
continuous cell line |
cell strain |
|
adherent cells |
suspension cells |
monolayer |
confluence |
|
cell concentration |
culture medium |
homeostasis |
MSCs |
|
THP-1 cells |
NHDFs |
fibroblast |
viable cell |
|
model |
two dimensional culture |
three dimensional culture |
reproducibility |
|
observation |
interpretation |
control |
hypothesis |
Review Questions
1. Explain why two healthy cultures might have different appearances.
2. Distinguish cell culture, tissue culture, and organ culture.
3. Why does the term cell line not necessarily mean unlimited growth?
4. Compare a cell strain with a continuous cell line.
5. Explain why culture origin and growth pattern must be described separately.
6. Why is confluence useful for an adherent culture but not a direct measure of suspension cell concentration?
7. Compare the expected routine growth patterns of THP-1 cells and NHDFs.
8. Give one advantage and one limitation of studying cells outside the body.
9. Explain why a reproducible culture result may still fail to predict a response in a person.
10. A culture has fewer attached cells after treatment. Give three possible explanations and identify an additional measurement that could help.
11. What records would help another technician compare two cultures fairly?
12. What does the history of HeLa cells teach about the responsibilities connected to biological samples?
Apply Your Understanding
Two groups compare a treatment using NHDFs. Group A begins with a nearly covered growth surface. Group B begins with only a few attached cells. Both groups use the same treatment and report different final cell counts.
Identify a starting difference that could affect the comparison. Explain why the final counts alone do not show which group experienced the stronger treatment effect. Describe the observations and controls you would want before drawing a conclusion.
A student removes and discards the culture medium from a flask of THP-1 cells, expecting the cells to remain attached as NHDFs do. Explain how this decision could affect the culture. What information should the student check before removing the liquid?
A culture has been transferred into fresh vessels several times. A student concludes that it must be a continuous cell line. Explain why repeated transfers alone do not support this conclusion. How would a finite cell line differ from a continuous cell line over time?
Two NHDF cultures receive the same treatment, but only one shows a change in cell shape. The cultures came from different donors and were maintained in different media. Identify two possible explanations for the different responses. How would you redesign the comparison to investigate whether the treatment caused the change?