Why are dopamine neurons in the ventral tegmental area (VTA) resistant to paraquat toxicity?
Answer
They have higher expression of the calcium-buffering protein calbindin-D28K
While paraquat toxicity is devastating to the substantia nigra pars compacta, the dopamine neurons in the ventral tegmental area (VTA) exhibit a notable resistance. This resistance is attributed to cellular protective mechanisms, specifically the higher levels of the calcium-buffering protein known as calbindin-D28K. This protein helps the cells manage the stress and ionic imbalances caused by the toxin, preventing the cell death observed in other populations.
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