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Assessment of toxicological consequences upon acute inhalation exposure to chemically improvised nonlethal riot control combinational formulation (NCF) containing oleoresin capsicum and skatole.

Sensory irritation is an acute adverse effect leading to temporary disability posed by riot control agents in various deployable forms are utilized by defense personal in violent mob attacks but their irreversible toxic effects and risk assessment have been a matter of concern. These intimidating risks of available riot control agents have led to exploring the pulmonary toxicity profile of the oil in water emulsion formulation developed for vicious crowd controls containing an irritant oleoresin capsicum, a malodorant (skatole), and a commercial dye, followed by characterization using standard methods. Nonlethal riot control combinational formulation (NCF) has been aimed to be the best possible low-lethal alternative for riot control measures. In this study, 30 min of acute inhalation exposure of NCF was given to Wistar rats and various respiratory parameters like lung dynamics, bronchoalveolar lavage fluid (BALF) cytological assays, pro-inflammatory cytokines estimation, antioxidant activity, collagen accumulation, cytotoxicity, in vivo lung imaging, western blot, histology of lung tissue, etc. were investigated to validate its potentiality and rate of irritation reversibility as nonlethal agents. An exaggerated physiological change like sensory irritation, changes in lung functional variables, increased pro-inflammatory cytokines, etc. were noticed initially without airway obstruction as the expression of nociceptive TRPV1 protein did not alter the physiological regulation of protective proteins like Nrf2 and HO-1 and also no abnormality was found in lung tissue architecture. In conclusion, it can be stated that this formulation can be explored as a nonlethal riot control agent intending to generate discomfort but with early reversibility of sensory irritation and no recurrence of toxicity.