Passage number in mammalian cells

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SUMMARY

The discussion centers on the passage number of mammalian cells, specifically regarding a cell line with a maximum of 10 passages. After performing 4 passages and creating a frozen stock, it is established that thawing and re-passing the frozen stock counts as an additional passage, leaving approximately 5-6 passages remaining. The conversation also touches on advanced techniques for regaining lost characteristics in immortal cell lines, such as re-passing through an animal, although this method's effectiveness varies.

PREREQUISITES
  • Understanding of cell culture techniques
  • Knowledge of passage number implications in mammalian cells
  • Familiarity with cryopreservation methods
  • Awareness of immortal cell line characteristics
NEXT STEPS
  • Research cryopreservation protocols for mammalian cells
  • Learn about the effects of passage number on cell behavior
  • Investigate techniques for re-establishing characteristics in immortal cell lines
  • Explore the process of creating cell pellets for implantation in animal models
USEFUL FOR

This discussion is beneficial for cell biologists, researchers in tissue culture, and anyone involved in the maintenance and manipulation of mammalian cell lines.

Goodie
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if a cell line has a maximum of 10 passages before it changes character and i only have done 4 passages of it and made the frozen stock of some of the cells. how many passages does this frozen stock have if i thaw it and passage it? will it be only 6 passages left or 10 passages?

thanks for any inputs.
 
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Typically you would consider the freeze-thaw another passage and call it around 5-6 passages left. I think the only way you can sometimes regain lost characteristics in immortal cell lines is to re-passage the cells back through an animal by creating a cell pellet and implanting it, but this may not work for all situations. Any one done this?
 

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