Site-Specific PEGylation of Factor VIII (PEG-FVIII) Preserves Full Clotting Activity and Extends Therapeutic Efficacy in HemophiliaA Dogs
Bibliographic record
Abstract
Abstract To improve the effectiveness of Factor VIII replacement therapy for Hemophilia A, we sought to develop a PEGylated Factor VIII that would effectively treat bleeding episodes, while reducing the frequency of intravenous injections required for prophylaxis. Previously, we found that the site-specific PEGylation of Factor VIII (PEG-FVIII) preserves full clotting activity, prolongs circulating half-life and extends therapeutic efficacy in a number of bleeding models in hemophilic mice. To further characterize its activity, four naïve Hemophilia A dogs were treated with either PEG-FVIII or unmodified BDD-FVIII in a cross-over study design. All treated dogs showed normalized Whole Blood Clotting Time (WBCT), whole blood Thromboelastograph (TEG) profile, and Cuticle Bleeding Time within 30 min from dosing. Pharmacokinetic analysis of the decay of plasma FVIII activity and antigen levels showed that PEG-FVIII achieved 2-fold longer half-life and reduced clearance and volume of distribution relative to BDD-FVIII. Consistently, PEG-FVIII also demonstrated significantly prolonged efficacy relative to BDD-FVIII by measurement of WBCT and TEG. Both BDD-FVIII and PEG-FVIII were well tolerated in naïve HemA dogs, normal hematology and serum chemistry values were observed following administration. However, two naive dogs that received BDD-FVIII and one naive dog that received PEG-FVIII developed detectable neutralizing antibodies to human FVIII as early as on day 9 post-treatment. In summary, consistent with our previously reported findings in hemophilic mice, in comparison to BDD-FVIII, PEG-FVIII demonstrated superior half-life, full activity in stopping acute bleeding and prolonged efficacy in hemophilia A dogs. Taken together, the results support the use of site-specific PEGylation to create a homogeneous therapeutic for both prophylactic and on-demand treatment of patients with Hemophilia A.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.001 | 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 | 0.001 |
| 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".