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. 2020 Apr 16;13:175–185. doi: 10.2147/JIR.S244434

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© 2020 Gellatly et al.

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(A) Trans-epithelial electrical resistance (TEER) was measured using an epithelial volt/ohm meter in air-liquid interface cultured human small airway epithelial cells (n = 4 subjects) exposed to ambient air, nicotine-free (NF) or nicotine-containing (Nic) e-vapor (tobacco flavor). (B) Lactate dehydrogenase (LDH) levels were quantified in basolateral supernatants of air-liquid interface cultured human small airway epithelial cells (n = 6 subjects) exposed to ambient air, nicotine-free (NF) or nicotine-containing (Nic) e-vapor (tobacco flavor). Each color represents an individual donor. The square shape represents the smoker.