Early embryonic exposure to chlorpyrifos‐cypermethrin combination induces pattern deficits in the heart of domestic hen
2021
Verma, Urja | Khaire, Kashmira | Desai, Isha | Sharma, Shashikant | Balakrishnan, Suresh
Exposure to chlorpyrifos‐cypermethrin combination during early development resulted in defective looping and ventricular noncompaction of heart in domestic chicken. The study was extended to elucidate the molecular basis of this novel observation. The primary culture of chicken embryonic heart cells showed a concentration‐dependent loss of viability when challenged with this combination of technical‐grade insecticides. Comet assay, DNA ladder assay, and analyses of appropriate markers at transcript and protein levels, revealed that chlorpyrifos‐cypermethrin combination induced cell death by activating apoptosis. Parallelly, the tissues derived from control and experimental group hearts were checked for apoptotic markers, and the result was much similar to that of the in‐vitro study. Further analysis showed that chlorpyrifos‐cypermethrin combination deranged the expression pattern of the transcriptional regulators of cardiogenesis, namely TBX20, GATA5, HAND2, and MYOCD. This, together with heightened apoptosis, could well be the reason behind the observed structural anomalies in the heart of chlorpyrifos‐cypermethrin poisoned embryos.
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