Cell Culture: poor attachment

1. Ranked causes

   1. Missing collagen (or other ECM) coating on plates used for epithelial cellsEpithelial / primary epithelial cultures stay rounded on untreated plastic; the same lot attaches on collagen-I–coated wells.
   2. Wrong coating type or expired coating reagent lotCoating was applied but with an expired or non-cell-type-matched matrix.
   3. Trypsinization too aggressive, damaging surface adhesion proteinsAdherence worse right after a harsher-than-usual trypsin step.
   4. Serum lot variability affecting attachment factorsCoincides with a new FBS lot.
   5. Cell-line identity / passage drift (wrong or over-passaged line)Adherence phenotype differs from authenticated early-passage stock.

2. Recovery steps

   1. Pre-coat plates with collagen I (or the cell-type-appropriate matrix) before seeding epithelial cellsCollagen coating → epithelial attachment is a common advance when untreated plastic fails.
   2. Replace coating reagent with a fresh, cell-type-matched lotRules out expired fibronectin/collagen/PDL as the silent material failure.
   3. Shorten trypsin exposure and neutralize immediately with serum-containing mediaPreserves surface adhesion proteins during dissociation.
   4. Authenticate the line if attachment phenotype diverges from the stock descriptionMisidentified lines often show unexpected adherence behaviour.

3. Controls first

   • Did control wells (same coating / untreated vehicle) also fail to attach?If yes: Coating, serum lot, or cell-line identity — not a treatment effect.
   • Is this an epithelial (or other ECM-dependent) line seeded on untreated plastic?If yes: Coat with collagen I (or the recommended matrix) before other troubleshooting.

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