Regul Pept 111: 137-144, 2003
In particular, no mutation of the DRD2 gene has been found in 79 prolactinomas ( Similarly to DRD2, no mutations of SSTR2 and SSTR5 genes are usually found in resistant patients ( This missense mutation is located in the third intracellular loop of SST5, a critical region for G protein coupling, and functional studies have demonstrated that mutant R240W receptor failed to mediate the inhibition of GH release and cell proliferation induced by SSTR5 agonist, although it retained the ability to inhibit intracellular cAMP levels, as the result of a loss of coupling with G oA protein but not with the other G proteins activated by wild type SSTR5, e.g., G i1, i2, i3 and G oB ( Polymorphic variants in SSTR2 gene seem to have no role in determining SS resistance of GH-secreting tumors
Reuter SE
Regardless, these decisions come down to a cost / benefit analysis for self-funded employers who are considering adding these drugs to their coverage lineup
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