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Effect Of Rhamnolipids On Permeability Across Caco-2 Cell Monolayers

Charity J. Wallace, Scott H. Medina, M. ElSayed
Published 2013 · Chemistry, Medicine

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ABSTRACTPurposeThis report describes the effect of rhamnolipids (RLs), an amphiphilic biosurfactant produced by the bacterium Pseudomonas aeruginosa, on the integrity and permeability across Caco-2 cell monolayers.MethodsWe measured the trans-epithelial electrical resistance (TEER) and permeability of [14C]mannitol across Caco-2 cell monolayers upon incubation with 0.01–5.0% v/v RLs as a function of incubation time (30, 60, 90, and 120 min). We also studied the recovery of RL-treated Caco-2 cell monolayers upon incubation with Kaempferol, which is a natural flavonoid that promotes the assembly of the tight junctions.ResultsTEER of Caco-2 cell monolayers incubated with 0.01–5.0% v/v RLs solution dropped to 80–28% of that of untreated cells. Decline in TEER was associated with an increase in [14C]mannitol permeability as a function of RLs concentration and incubation time with Caco-2 cells. Incubation of RLs-treated Caco-2 cell monolayers with normal culture medium for 48 h did not restore barrier integrity. Whereas, incubation of a RLs-treated Caco-2 cells with culture medium containing Kaempferol for 24 h restored barrier function indicated by the higher TEER and lower [14C]mannitol permeability values.ConclusionsThese results show the ability of RLs to modulate the integrity and permeability of Caco-2 cell monolayers in a concentration- and time-dependent fashion, which suggest their potential to function as a non-toxic permeation enhancer.
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