Up‐regulating Heme Oxygenase System Potentiates Pancreatic Repair by Enhancing Proteins of Regeneration
Bibliographic record
Abstract
Background Autoimmune‐mediated enhanced beta cell destruction and resultant insulin insufficiency poses a great health risk in type‐1 diabetes mellitus affected individuals. Our previous observations have shown that up‐regulation of the heme oxygenase (HO) by HO‐inducer hemin improved pancreatic lesion in streptozotocin‐induced diabetes, yet the hemin mediated pancreatic tissue repair mechanisms are still unclear. Accordingly, the aim of this study was to examine the effects of up‐regulating the HO system on proteins of regeneration during pancreatic repair in streptozotocin‐induced type‐1 diabetic animal model. Methods/Results Streptozotocin (STZ) was used to induce diabetes, while HO system was up‐regulated with hemin or inhibited with chromium mesoporphyrin. Histology/morphology, spectrophotometry, enzyme‐immunoassay (EIA), enzyme‐linked immunosorbent assay (ELISA) and Western‐immunoblotting were used to demonstrate pancreatic tissue injury and repair. Our data demonstrated that treatment with hemin to STZ‐induced diabetic animals effectively suppressed the pancreatic histopathological lesions (vacuolization, interstitial edema, mononuclear cell infiltration and fibrosis), while enhanced several proteins implicated in pancreatic repair/regeneration and beta cell growth and maturation including Oct3/4, Pax‐2, beta‐catenin, ISL‐1, glucose transporter‐2 (GLUT2), homeodomain protein NKK6.1. Interestingly, hemin treatment also increased the expression of stem cell markers such as cKit and Sca‐1, suggesting the involvement of stem cells and proteins of regeneration during pancreatic repair/regeneration in STZ diabetic animals. Moreover, the restoration of pancreatic morphology was accompanied by increased production of insulin and the potentiation of important proteins of insulin signaling pathway such as insulin‐receptor substrate (IRS‐1), IRS‐2, phosphatidylinositol‐3‐kinase (PI3K) and Glucose transporter‐4 (GLUT4) in skeletal muscles and the liver from STZ diabetic animals. Furthermore, hemin significantly reduced the inflammation and oxidative stress in the pancreas, skeletal muscles and liver, In contrast, these effects were nullified by the HO‐inhibitor, chromium mesoporphyrin. Conclusion Taken together, our findings demonstrate that upregulating the HO‐system with hemin is a useful strategy to potentiate proteins of regeneration such as Oct3/4, Pax‐2, beta‐catenin, ISL‐1 , GLUT2 and NKK6.1 during the restoration of pancreatic morphology in streptozotocin‐induced diabetic animals. Importantly, the restoration of pancreatic morphology was accompanied by improved insulin production and the potentiation of proteins implicated in insulin signaling and glucose metabolism. Thus, HO‐inducers may open a new horizon in the search for remedies of type‐1 diabetes. Support or Funding Information Heart & Stroke Foundation of Saskatchewan, Canada
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".