Abstract
Background
The objective of the present study was co-delivery of venlafaxin (VEN) and doxycycline (DOX), a matrix metalloproteinase inhibitor drug, for alleviating inflammation and neuropathy in diabetic foot ulcer (DFU).
Methods
Bacterial cellulose nanofiber sheets (BCNS) were loaded with DOX and VEN and categorized by their loading efficiency, release profiles and ex vivo permeation throughrat skin. The optimized nanofibers were used in patients with DFU to compare with the standard wound care regimen during a 12-week trial. Wound area was measured every 2Â weeks. Biochemical parameters and microscopic studies of the skin were examined prior and at the end of the treatment. The Michigan Neuropathy Screening Instrument (MNSI) questionnaire was utilized to assess diabetic neuropathy.
Results
The optimum formulation showed loading efficiency of 37.8 ± 1.6% for DOX and 48 ± 1.9% for VEN. Rat skin permeation was 40% for DOX after 7–29 h and 83% for VEN during 105 h. Patients treated with BCNS showed no significant difference in their biochemical parameters before and after intervention. The ulcer size showed faster reduction after 12 weeks in the treatment group compared to the control group. The abnormal responses in the MNSI questionnaire decreased and pain-free walking distance increased significantly in the treatment group compared with the control group (p < 0.001). Microscopic studies of the skin after using nanofibers showed a large number of polymorphonuclear chronic inflammatory cells and formation of new capillary beds.
Conclusions
The BCNS loaded with DOX and VEN may expedite healing and reduce neuropathy in the DFU of diabetic patients.
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References
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The authors appreciate financial support of the project by Isfahan Endocrine and Metabolism Research Center.
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All procedures performed in this study involving human participants were in accordance with the ethical standards of the Isfahan University of Medical Sciences ethics committee (license code of 9531) and have been performed in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki.
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Meamar, R., Chegini, S., Varshosaz, J. et al. Alleviating neuropathy of diabetic foot ulcer by co-delivery of venlafaxine and matrix metalloproteinase drug-loaded cellulose nanofiber sheets: production, in vitro characterization and clinical trial. Pharmacol. Rep 73, 806–819 (2021). https://doi.org/10.1007/s43440-021-00220-8
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DOI: https://doi.org/10.1007/s43440-021-00220-8