Image1: A platypus. The same hormone produced in the gut of the platypus to regulate blood glucose is also produced in their venom, researchers have found – and that hormone could be used in possible type 2 diabetes treatments. Image2: An echidna. The same hormone produced in the gut of the echidna to regulate blood glucose is also produced in their venom, researchers have found – and that hormone could be used in possible type 2 diabetes treatments.
Australian researchers have discovered remarkable evolutionary changes to insulin regulation in two of the nation’s most iconic native animal species – the platypus and echidna – which could pave the way for new treatments for type 2 diabetes in humans. The findings reveal the same hormone produced in the gut of the platypus to regulate blood glucose is also surprisingly produced in their venom. The hormone, glucagon-like peptide-1 (GLP-1), is normally secreted in the gut of both humans and animals, stimulating release of insulin to lower blood glucose.But GLP-1 typically degrades within minutes.
In people with type 2 diabetes, the short stimulus triggered by GLP-1 isn’t sufficient to maintain a proper blood sugar balance. As a result, medication that includes a longer lasting form of the hormone is needed to help provide an extended release of insulin.”Our research team has discovered that monotremes – our iconic platypus and echidna – have evolved changes in the hormone GLP-1 that make it resistant to the rapid degradation normally seen in humans,” says Professor Frank Grutzner, University of Adelaide’s School of Biological Sciences and the Robinson Research Institute.
“We’ve found that GLP-1 is degraded in monotremes by a completely different mechanism. Further analysis of the genetics of monotremes reveals that there seems to be a kind of molecular warfare going on between the function of GLP-1, which is produced in the gut but surprisingly also in their venom,” he says. The platypus produces a powerful venom during breeding season, which is used in competition among males for females.
Identification and characterisation of monotreme Gcg genes and GLP-1 peptides.
“We’ve discovered conflicting functions of GLP-1 in the platypus: in the gut as a regulator of blood glucose, and in venom to fend off other platypus males during breeding season. This tug of war between the different functions has resulted in dramatic changes in the GLP-1 system,” says Associate Professor Briony Forbes, from Flinders University’s School of Medicine. “The function in venom has most likely triggered the evolution of a stable form of GLP-1 in monotremes. Excitingly, stable GLP-1 molecules are highly desirable as potential type 2 diabetes treatments,” she says.
GLP-1 has also been discovered in the venom of echidnas. But while the platypus has spurs on its hind limbs for delivering a large amount of venom to its opponent, there is no such spur on echidnas. “The lack of a spur on echidnas remains an evolutionary mystery, but the fact that both platypus and echidnas have evolved the same long-lasting form of the hormone GLP-1 is in itself a very exciting finding,” Professor Grutzner says. http://www.newswise.com/articles/platypus-venom-could-hold-key-to-diabetes-treatment http://www.nature.com/articles/srep37744
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