Predicting eye stinging potential of baby shampoos by assessing TRPV1 channel activity

• The Transient Receptor Potential Vanilloid type 1 (TRPV1) receptor is one of the most well characterized pain-inducing receptors. The purpose of this study was to predict human eye stinging of 19 baby bath and shampoo formulations by studying TRPV1 activity. The NociOcular test, a novel recombinant neuronal in vitro model with high expression of functional TRPV1 channels was used to test shampoo formulations containing surfactants, preservatives, and fragrances (sodium laureth sulfate, cocoamidopropylbetaine, cocoglucoside, sodium benzoate, quaternium-15, etc.). The increase in intracellular free Ca2+ was analysed by fluorescence during exposure. TRPV1-specific Ca2+ influx was abolished when the TRPV1 channel antagonist capsazepine was applied to the cells prior to shampoo samples. The positive control, i.e. adult shampoo, was the most active sample tested in the NociOcular test and also induced the worst stinging sensation. The negative control, i.e. marketed baby shampoo, was negative in both tests. Seven of the formulations induced stinging in the human test, and of those six were positive in the NociOcular test. Twelve of the formulations were classified as non-stinging in the human test, and of those 10 were negative in the NociOcular test. None of the established in vitro tests for eye irritation were able to correctly predict the human stinging sensation of the baby products. Our data support that the TRPV1 channel is a principle mediator of eye stinging sensation induced by baby bath and shampoo formulations and that the NociOcular test may be a valuable in vitro tool to predict human eye stinging sensation.

Ämnesord

NATURVETENSKAP  -- Biologi -- Cellbiologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences -- Cell Biology (hsv//eng)

Nyckelord

Neurochemistry and Neurotoxicology

neurokemi och neurotoxikologi

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