JEWJITSU PEPTIDES research roundup: GLP‑1RA gastroparesis, neonicotinoid arrested ecdysis, and enzyme‑triggered alkoxyamines

A systematic review following PRISMA methods summarized published reports of symptomatic gastroparesis associated with glucagon‑like peptide‑1 receptor agonists (GLP‑1RAs). The authors screened several databases and identified twelve case reports representing 13 patients. Most cases involved people with type 2 diabetes, though non‑diabetic individuals were also described, and semaglutide was the most frequently mentioned agent. Reported presentations ranged from acute to chronic onset and included symptoms such as nausea, vomiting, abdominal pain, bloating, early satiety, and oral intolerance. Diagnostic evaluations in the reports included imaging or endoscopy showing retained gastric contents or distension, and selected cases used gastric emptying scintigraphy to document delayed emptying. Management in these case reports centered on supportive and symptomatic care, and the reports note that discontinuation of the implicated GLP‑1RA was followed by symptom resolution in the described patients. The review also assessed methodological quality of case reports using a standard checklist. Limitations are inherent: the evidence comes from a small number of case reports and case series, which restricts generalizability and precludes estimates of frequency, risk factors, or causal certainty beyond the reported observations.

An experimental entomology study evaluated effects of topical neonicotinoid applications on ecdysis in three coleopteran species: Tenebrio molitor, Tribolium castaneum, and Leptinotarsa decemlineata. The work applied neonicotinoids at doses described as non‑paralytic and reported that treatments at least one day before adult emergence produced arrested ecdysis. In affected individuals, adults developed under the pupal cuticle and initiated pre‑ecdysis movements and partial shedding of abdominal cuticle and tracheal linings, but the process stalled: remaining pupal cuticle and tracheae were not shed, wings did not expand, and head and thoracic ecdysial lines typically did not break. Treated insects often remained alive, showing antennal and leg movements despite the developmental arrest. Additional topical applications to larval instars also caused arrested pupal or larval ecdysis in the tested species. The authors interpret the results as implicating nicotinic acetylcholine receptors in regulation of coleopteran ecdysis and note consistency with prior findings in Lepidoptera; however, these are controlled laboratory exposures in a few species and the applicability to field conditions, other taxa, or ecological outcomes is limited by the experimental scope.

A chemical biology report describes the design and synthesis of a new class of enzyme‑triggered alkoxyamine derivatives that use a carbohydrate leaving group and are intended to release alkyl radicals after enzymatic cleavage by glycosidases. The work builds on prior demonstrations that peptide‑linked alkoxyamines can undergo C–O bond homolysis after peptidase cleavage to generate reactive radicals; the current study extends the concept to carbohydrate‑based triggers aimed at coupling enzymatic specificity with controlled radical release. The authors frame this approach as a platform concept for developing next‑generation agents that could, in principle, target cells or organisms presenting the activating enzyme. The report is focused on chemical design and synthesis and does not provide clinical or in vivo efficacy or safety data; it therefore represents an early, preclinical stage of work that requires further biological testing to evaluate selectivity, activity, and potential toxicology.