Moreover, it appears that it is the membrane-bound form of the enzyme, on sites such as the luminal surface of capillary endothelial cells, which is more important for GLP-1 degradation than the circulating (soluble) enzyme (74, 75), questioning the relevance of any association between the plasma activity per se and glycaemic control, since it is unclear whether changes in soluble DPP-4 activity in the circulation accurately reflect any changes in total DPP-4 activity
Despite the intriguing possibility of a pill, all available formulations, like the injectable options, have undergone rigorous testing and approval processes, something which oral alternatives have not yet achieved
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