Trial reportThe review of diabetic studies : RDS
Inverse Association of Peripheral Orexin-A with Insulin Resistance in Type 2 Diabetes Mellitus: A Randomized Clinical Trial.
Trial report in The review of diabetic studies : RDS. The graph read 1 number from its abstract, feeding 3 cells of the map, but none could be read as for or against, so it casts no vote. Cited by 10 papers, 2 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
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Three-month treatment with metformin and pioglitazone significantly improved insulin sensitivity and increased orexin concentrations by 26% (p = 0.025) and 14% (p = 0.076), respectively.
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Where it lands on the map
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What it adds to each cell
For every cell the paper feeds: the belief in the claim with and without this paper, and this paper's estimate drawn against every other readable study in the cell. The ringed dot is this paper.
Insulin×glycemic control
No readable resultOpen on the map →What to test next →40 readable studies in this cell: 14 favour the treatment, 14 find no difference, 13 favour the comparator.
This paper's own estimate is on a different scale from the rest of the cell, so it is not drawn here.
Metformin×glycemic control
No readable resultOpen on the map →What to test next →40 readable studies in this cell: 41 favour the treatment, 12 find no difference, 8 favour the comparator.
This paper's own estimate is on a different scale from the rest of the cell, so it is not drawn here.
Thiazolidinediones×glycemic control
No readable resultOpen on the map →What to test next →16 readable studies in this cell: 9 favour the treatment, 4 find no difference, 3 favour the comparator.
This paper's own estimate is on a different scale from the rest of the cell, so it is not drawn here.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
10 citing papers in PubMed, 2 syntheses or guidelines pooled it, 14 citations in OpenAlex.
- Orexinergic pathway as a potential therapeutic candidate for the modulation of glucose homeostasis.Frontiers in physiology · 2025Pooled it
- Associations of plasma hypocretin-1 with metabolic and reproductive health: Two systematic reviews of clinical studies.Sleep medicine reviews · 2020Pooled it
- Article
- Molecular Biomarkers and Therapeutic Approach of Patients with Diabetes and Obstructive Sleep Apnea.International journal of molecular sciences · 2025Review
- Orexins in apoptosis: a dual regulatory role.Frontiers in cellular neuroscience · 2024Review
- The interrelationship between sleep, diet, and glucose metabolism.Sleep medicine reviews · 2023Review
- Review
- A Growing Link between Circadian Rhythms, Type 2 Diabetes Mellitus and Alzheimer's Disease.International journal of molecular sciences · 2022Review
- Orexins: A promising target to digestive cancers, inflammation, obesity and metabolism dysfunctions.World journal of gastroenterology · 2021Review
- Association between use of oral hypoglycemic agents in Japanese patients with type 2 diabetes mellitus and risk of depression: A retrospective cohort study.Pharmacology research & perspectives · 2019Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
8 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The marked sentences are the ones the graph read a number from.
aimsTo investigate the association between serum orexin concentrations and insulin resistance/sensitivity in a sample of patients with type 2 diabetes mellitus, and to study the effects of anti-hyperglycemic treatment on orexin concentrations over three months.
methodsThis study was designed as a randomized, open-label, clinical trial. Before allocation, sixty medication-naïve, newly-diagnosed, type 2 diabetes patients underwent a 75 g oral glucose tolerance test (OGTT). Afterwards, using a randomized trial design (IRCT201102275917N1) patients were allocated to either the metformin (1000 mg daily) or pioglitazone (30 mg daily) arm, and were reexamined after three months. Serum insulin, plasma glucose, and orexin concentrations were measured at baseline, during OGTT, and after three months.
resultsOrexin concentrations significantly decreased after OGTT (0 vs. 120 min: 0.63 ± 0.07 vs. 0.31 ± 0.03 ng/ml, p < 0.001). Insulin resistance determined by homeostasis model assessment of insulin resistance (HOMA-IR) was significantly and negatively correlated with orexin (r = -0.301, p = 0.024). Furthermore, orexin concentrations were significantly and positively correlated with the insulin sensitivity index derived from OGTT (r = 0.326, p = 0.014). Three-month treatment with metformin and pioglitazone significantly improved insulin sensitivity and increased orexin concentrations by 26% (p = 0.025) and 14% (p = 0.076), respectively. Between-group analysis showed that changes in orexin concentrations with metformin and pioglitazone were not significantly different (p = 0.742).
conclusionsThere was a negative association between peripheral orexin concentrations and insulin resistance in type 2 diabetes patients. Three-month anti-hyperglycemic treatment with proportionate doses of metformin or pioglitazone increased orexin concentrations via amelioration of insulin resistance and improvement of glycemic control.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.