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A separate retrospective study published in 2025 in JAMA Ophthalmology compared patients who took either oral or subcutaneous semaglutide for type 2 diabetes and matched them to control based on race, sex, A1c and comorbid conditions such as DR, sleep apnea, hypertension and hyperlipidemia

While these antiinflammatory effects have not been attributed to GLP-1 action in specific organs or cell types, the kidney GLP-1R has been localized primarily to vascular smooth muscle cells within renal arteries and arterioles using either 125 I-labeled exendin-4, a validated antiGLP-1R antibody, or in situ hybridization (71, 72)

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A practical default is to treat most reconstituted peptide solutions as short-term materials: refrigerate at 2-8 C , protect from light, minimize vial punctures, and plan to use or discard the vial within about 28 days unless the supplier provides compound-specific stability data

The metabolic actions of glucagon revisited