Key result
Depletion of Rap1 in Dictyostelium cells reduced growth rate, cell viability, and cGMP accumulation in response to osmotic shock, suggesting a direct role for Rap1 in guanylyl cyclase activation.
In Dictyostelium, Rap1 is essential for cell viability and plays a direct role in activating guanylyl cyclase during the response to hyperosmotic stress.
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No clinical implications yet; leaves open Rap1's role in mammalian guanylyl cyclase regulation.
Kang et al. (2002) studied this question. Antisense RNA from the rapA gene (Rap1 depletion) was evaluated on Cell viability and cGMP accumulation in response to osmotic stress. Depletion of Rap1 in Dictyostelium cells reduced growth rate, cell viability, and cGMP accumulation in response to osmotic shock, suggesting a direct role for Rap1 in guanylyl cyclase activation.
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