The Effect of Obesity on the α-Cell Response to Hyperglycemia in the Presence of Amino Acids.
Sneha Mohan, Federica Boscolo, Hannah E Christie et al.
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In 30 seconds
This randomized, two-occasion study examined how amino acids affect glucagon suppression during graded glucose infusion in lean participants and participants with obesity, with or without hepatic steatosis. Glucagon secretion was suppressed similarly by glucose alone across groups. With amino acid infusion, the glucose level required to reduce glucagon secretion by 50% (G50) increased in participants with obesity, indicating impaired suppression, but did not change in lean participants. The response in obesity was similar regardless of hepatic steatosis, suggesting that obesity-related α-cell responsiveness to amino acids is not explained by steatosis.
Key findings
- Glucose alone produced no difference in G50 between lean participants and those with obesity.
- Amino acid infusion increased G50 in participants with obesity, indicating reduced glucagon suppression as glucose rose.
- Amino acid infusion did not change G50 in lean participants.
- The amino acid-associated response in participants with obesity did not differ by presence or absence of hepatic steatosis.
Why it matters
The findings identify a context-dependent difference in α-cell function: glucagon suppression by glucose alone appeared normal, while amino acids exposed impaired suppression in participants with obesity. This may help explain how α-cell dysfunction can be evident under nutrient conditions relevant to prediabetes before an abnormal response to glucose alone is apparent.
What to keep in mind
The abstract does not report sample size or longer-term clinical outcomes; the findings come from an experimental infusion study and do not establish effects on diabetes progression.