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McLaughlin PJ, Sassani JW, Zagon IS. Safety study of topical naltrexone therapy for diabetic skin wounds is confirmed in Göttingen mini-pigs. Drug Dev Res 2023; 84:1279-1284. [PMID: 37317059 DOI: 10.1002/ddr.22086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 05/17/2023] [Accepted: 05/29/2023] [Indexed: 06/16/2023]
Abstract
This study was conducted to determine the safety of topical naltrexone treatment in Göttingen swine. Efficacy of topical naltrexone was performed previously in Sprague-Dawley rats. In this study, 25 male and female mini-pigs received topical naltrexone once daily for 30 days. The gel at doses of 1%, 2%, and 10% naltrexone was applied at a dose volume of 0.01 ml/cm2 to an area of unbroken skin encompassing 10% of the animal's surface. Body and food consumption, skin and organ morphology, and clinical signs, including blood analyses were taken periodically. Naltrexone levels in serum were measured at the time of death. No adverse observations were made in the cutaneous skin, autopsied organs, or biochemical parameters. The no-observed adverse effect level (NOAEL) was considered to be 2% topical application daily. The conclusions from the veterinarians and researchers are that topical naltrexone at 1% or 2% can be used safely in clinical efficacy studies.
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Affiliation(s)
- Patricia J McLaughlin
- Department of Neural and Behavioral Sciences, Penn State University College of Medicine, Hershey, Pennsylvania, USA
| | - Joseph W Sassani
- Department of Ophthalmology, Penn State University College of Medicine, Hershey, Pennsylvania, USA
| | - Ian S Zagon
- Department of Neural and Behavioral Sciences, Penn State University College of Medicine, Hershey, Pennsylvania, USA
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2
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Strobel MM, Baker KC, Berliner AL, Tang KN, Hepps Keeney CM, Lewbart GA. NALTREXONE AS A PROMISING TREATMENT FOR CLINICAL SIGNS OF LATERAL LINE DEPIGMENTATION IN PALETTE SURGEONFISH ( PARACANTHURUS HEPATUS). J Zoo Wildl Med 2023; 54:137-142. [PMID: 36971638 DOI: 10.1638/2022-0022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/20/2022] [Indexed: 03/29/2023] Open
Abstract
Lateral line depigmentation (LLD) is a common condition in managed tropical saltwater fish, and treatment is somewhat elusive. Naltrexone, an opioid receptor antagonist, enhances epithelial cell replication, cytokine production, and angiogenesis to stimulate wound healing in mice. A treatment trial with 11 palette surgeonfish with LLD was performed. Seven fish underwent a single topical treatment of a mixture of 4 mg naltrexone and 10 g iLEX petroleum paste applied topically to LLD lesions. Four additional fish served as controls: two received only topical iLEX and two received no treatment. Severity of disease was scored on a 0-3 scale. Inflammatory response was gauged on a separate 0-3 scale for 5 d after treatment based on severity of erythema, as seen in a clinical case performed prior to this study. After 11 days, four affected animals that lacked an inflammatory response after naltrexone topical treatment were administered a single dose of intralesional 0.04% naltrexone (4 mg diluted into 10 ml saline). Lesions on all fish were photographed and measured at day 33. Clinical improvements in lesion size and pigmentation were apparent following topical naltrexone therapy in fish with severe lesions. Although these cases are promising, more data are needed to further evaluate the effectiveness of naltrexone 0.04% in treating LLD lesions in palette surgeonfish.
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Affiliation(s)
| | | | | | - Karisa N Tang
- The A. Watson Armour III Center for Animal Health and Welfare, John G. Shedd Aquarium, Chicago, IL 60605, USA
| | | | - Gregory A Lewbart
- North Carolina State University College of Veterinary Medicine, Raleigh, NC 27607, USA
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3
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Lin S, Wang Q, Huang X, Feng J, Wang Y, Shao T, Deng X, Cao Y, Chen X, Zhou M, Zhao C. Wounds under diabetic milieu: The role of immune cellar components and signaling pathways. Biomed Pharmacother 2023; 157:114052. [PMID: 36462313 DOI: 10.1016/j.biopha.2022.114052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 11/19/2022] [Accepted: 11/25/2022] [Indexed: 12/05/2022] Open
Abstract
A major challenge in the field of diabetic wound healing is to confirm the body's intrinsic mechanism that could sense the immune system damage promptly and protect the wound from non-healing. Accumulating literature indicates that macrophage, a contributor to prolonged inflammation occurring at the wound site, might play such a role in hindering wound healing. Likewise, other immune cell dysfunctions, such as persistent neutrophils and T cell infection, may also lead to persistent oxidative stress and inflammatory reaction during diabetic wound healing. In this article, we discuss recent advances in the immune cellular components in wounds under the diabetic milieu, and the role of key signaling mechanisms that compromise the function of immune cells leading to persistent wound non-healing.
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Affiliation(s)
- Siyuan Lin
- Shanghai Traditional Chinese Medicine Integrated Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200082, China; Institute for Interdisciplinary Medicine Sciences, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China; School of Public Health, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Qixue Wang
- Shanghai Traditional Chinese Medicine Integrated Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200082, China; Institute for Interdisciplinary Medicine Sciences, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Xiaoting Huang
- Shanghai Traditional Chinese Medicine Integrated Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200082, China
| | - Jiawei Feng
- Shanghai Traditional Chinese Medicine Integrated Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200082, China
| | - Yuqing Wang
- Shanghai Traditional Chinese Medicine Integrated Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200082, China
| | - Tengteng Shao
- Shanghai Traditional Chinese Medicine Integrated Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200082, China
| | - Xiaofei Deng
- Shanghai Traditional Chinese Medicine Integrated Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200082, China
| | - Yemin Cao
- Shanghai Traditional Chinese Medicine Integrated Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200082, China
| | - Xinghua Chen
- Jinshan Hospital Affiliated to Fudan University, Shanghai, China.
| | - Mingmei Zhou
- Shanghai Traditional Chinese Medicine Integrated Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200082, China; Institute for Interdisciplinary Medicine Sciences, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
| | - Cheng Zhao
- Shanghai Traditional Chinese Medicine Integrated Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200082, China.
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Bardill JR, Laughter MR, Stager M, Liechty KW, Krebs MD, Zgheib C. Topical gel-based biomaterials for the treatment of diabetic foot ulcers. Acta Biomater 2022; 138:73-91. [PMID: 34728428 PMCID: PMC8738150 DOI: 10.1016/j.actbio.2021.10.045] [Citation(s) in RCA: 37] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/18/2021] [Accepted: 10/25/2021] [Indexed: 01/17/2023]
Abstract
Diabetic foot ulcers (DFUs) are a devastating ailment for many diabetic patients with increasing prevalence and morbidity. The complex pathophysiology of DFU wound environments has made finding effective treatments difficult. Standard wound care treatments have limited efficacy in healing these types of chronic wounds. Topical biomaterial gels have been developed to implement novel treatment approaches to improve therapeutic effects and are advantageous due to their ease of application, tunability, and ability to improve therapeutic release characteristics. Here, we provide an updated, comprehensive review of novel topical biomaterial gels developed for treating chronic DFUs. This review will examine preclinical data for topical gel treatments in diabetic animal models and clinical applications, focusing on gels with protein/peptides, drug, cellular, herbal/antioxidant, and nano/microparticle approaches. STATEMENT OF SIGNIFICANCE: By 2050, 1 in 3 Americans will develop diabetes, and up to 34% of diabetic patients will develop a diabetic foot ulcer (DFU) in their lifetime. Current treatments for DFUs include debridement, infection control, maintaining a moist wound environment, and pressure offloading. Despite these interventions, a large number of DFUs fail to heal and are associated with a cost that exceeds $31 billion annually. Topical biomaterials have been developed to help target specific impairments associated with DFU with the goal to improve healing. A summary of these approaches is needed to help better understand the current state of the research. This review summarizes recent research and advances in topical biomaterials treatments for DFUs.
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Affiliation(s)
- James R Bardill
- Laboratory for Fetal and Regenerative Biology, Department of Surgery, University of Colorado Denver School of Medicine and Children's Hospital Colorado, Aurora, CO, USA
| | | | - Michael Stager
- Department of Chemical and Biological Engineering, Colorado School of Mines, Golden, CO, USA
| | - Kenneth W Liechty
- Laboratory for Fetal and Regenerative Biology, Department of Surgery, University of Colorado Denver School of Medicine and Children's Hospital Colorado, Aurora, CO, USA
| | - Melissa D Krebs
- Department of Chemical and Biological Engineering, Colorado School of Mines, Golden, CO, USA
| | - Carlos Zgheib
- Laboratory for Fetal and Regenerative Biology, Department of Surgery, University of Colorado Denver School of Medicine and Children's Hospital Colorado, Aurora, CO, USA.
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McLaughlin PJ, Sassani JW, Purushothaman I, Zagon IS. Naltrexone blockade of OGFr enhances cutaneous wound closure in diabetic rats. MEDICINE IN DRUG DISCOVERY 2021. [DOI: 10.1016/j.medidd.2021.100098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Sex differences in the magnitude of diabetic ocular surface complications: Role of serum OGF. Physiol Behav 2021; 237:113436. [PMID: 33905807 DOI: 10.1016/j.physbeh.2021.113436] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 04/21/2021] [Accepted: 04/22/2021] [Indexed: 12/17/2022]
Abstract
Diabetes is associated with dysregulation of the Opioid Growth Factor (OGF) - OGF receptor (OGFr) regulatory pathway leading to elevated OGF levels in serum and tissues. This study was designed to investigate the role of sex on the magnitude of ocular surface complications by direct comparison of male and female type 1 diabetic (T1D) rats. Male and female adult Sprague-Dawley rats were rendered T1D; a cohort of T1D male and female rats received insulin (=T1D-INS). Tear production, corneal surface sensitivity, as well as serum levels of estrogen, testosterone, OGF and OGFr were measured. Multivariate analyses were performed for correlations between sex, condition and magnitude of ocular surface alterations. Significant differences were noted in all parameters tested between male and female Normal, T1D, and T1D-INS animals over the 8-week observation period. Multivariate analyses revealed that the magnitude of complications is greater in female T1D rats and has a strong negative correlation with serum estrogen and OGF. Ocular surface complications associated with T1D have an earlier onset and greater magnitude in female T1D rats than male diabetic animals, and are related to elevated levels of OGF.
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Choi HMC, Cheung AKK, Ng MCH, Zheng Y, Jan YK, Cheing GLY. Indentation Stiffness Measurement by an Optical Coherence Tomography-Based Air-Jet Indentation System Can Reflect Type I Collagen Abundance and Organisation in Diabetic Wounds. Front Bioeng Biotechnol 2021; 9:648453. [PMID: 33748093 PMCID: PMC7969662 DOI: 10.3389/fbioe.2021.648453] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Accepted: 02/09/2021] [Indexed: 11/13/2022] Open
Abstract
There is a lack of quantitative and non-invasive clinical biomechanical assessment tools for diabetic foot ulcers. Our previous study reported that the indentation stiffness measured by an optical coherence tomography-based air-jet indentation system in a non-contact and non-invasive manner may reflect the tensile properties of diabetic wounds. As the tensile properties are known to be contributed by type I collagen, this study was aimed to establish the correlations between the indentation stiffness, and type I collagen abundance and organisation, in order to further justify and characterise the in vivo indentation stiffness measurement in diabetic wounds. In a male streptozotocin-induced diabetic rat model, indentation stiffness, and type I collagen abundance and organisation of excisional wounds were quantified and examined using the optical coherence tomography-based air-jet indentation system and picrosirius red polarised light microscopy, respectively, on post-wounding days 3, 5, 7, 10, 14, and 21. The results showed significant negative correlations between indentation stiffness at the wound centre, and the collagen abundance and organisation. The correlations between the indentation stiffness, as well as collagen abundance and organisation of diabetic wounds suggest that the optical coherence tomography-based air-jet indentation system can potentially be used to quantitatively and non-invasively monitor diabetic wound healing in clinical settings, clinical research or preclinical research.
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Affiliation(s)
- Harry Ming Chun Choi
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Kowloon, Hong Kong
| | - Alex Kwok-Kuen Cheung
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Kowloon, Hong Kong
| | - Michelle Chun Har Ng
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Kowloon, Hong Kong
| | - Yongping Zheng
- Department of Biomedical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
| | - Yih-Kuen Jan
- Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Urbana, IL, United States
| | - Gladys Lai Ying Cheing
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Kowloon, Hong Kong
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Wang X, Zhang R, Wu T, Shi Y, Zhou X, Tang D, Yu W, So EC, Wu X, Pan Z, Tian J. Successive treatment with naltrexone induces epithelial-mesenchymal transition and facilitates the malignant biological behaviors of bladder cancer cells. Acta Biochim Biophys Sin (Shanghai) 2021; 53:238-248. [PMID: 33410473 DOI: 10.1093/abbs/gmaa169] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Indexed: 12/31/2022] Open
Abstract
Naltrexone is widely used for alleviating opioid-related side effects in cancer patients. However, the effects of naltrexone on cancer progression are controversial in the literature. The present study was carried out to investigate the effects of successive treatment with clinically relevant doses of naltrexone on the malignant biological behaviors of bladder cancer cells. The human bladder cancer T24 cells and mouse bladder cancer MB49 cells were treated with naltrexone. Cell proliferation, migration, and invasion abilities were analyzed. Morphological changes of the cells were confirmed by F-actin immunofluorescence staining. Epithelial-mesenchymal transition (EMT)-related markers and transcriptional factors, as well as activation of the phosphatidylinositol 3 kinase (PI3K)/AKT signaling pathway, were analyzed. Results showed that, compared with the control group, successive treatment with naltrexone significantly promoted the proliferation and decreased the apoptosis of bladder cancer cells, together with increase in cell migration and invasion ability. Continuous treatment with naltrexone also significantly reduced the expression of epithelial markers (E-cadherin and cytokeratin 19), increased the expression of mesenchymal markers (N-cadherin and vimentin) and EMT-inducing transcription factors (Snail and Slug), and further shifted the morphological phenotype of bladder cancer cells to a mesenchymal phenotype. The PI3K/AKT signaling pathway was activated by successive treatment with naltrexone. Notably, incubation with the specific PI3K inhibitor LY294002 together with naltrexone reversed the naltrexone-induced EMT progression. In conclusion, successive treatment with naltrexone may be favorable for the progression of bladder tumors by activating the PI3K/AKT signaling pathway and inducing EMT. Long-term exposure to naltrexone should be used cautiously in patients with bladder cancer.
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Affiliation(s)
- Xiaoqiang Wang
- Department of Anesthesiology, Renji Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai 200127, China
| | - Ruirui Zhang
- Department of Anesthesiology, Renji Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai 200127, China
| | - Tong Wu
- Department of Anesthesiology, Renji Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai 200127, China
| | - Yumiao Shi
- Department of Anesthesiology, Renji Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai 200127, China
| | - Xiao Zhou
- Department of Intensive Care, Renji Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai 200127, China
| | - Dan Tang
- Department of Anesthesiology, Renji Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai 200127, China
| | - Weifeng Yu
- Department of Anesthesiology, Renji Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai 200127, China
| | - Edmund Cheung So
- Department of Anesthesia, An Nan Hospital, China Medical University, Tainan 709010
| | - Xiaodan Wu
- Department of Anesthesiology, Fujian Provincial Hospital, Fujian Provincial Clinical Medical College, Fujian Medical University, Fuzhou 350001, China
| | - Zhiying Pan
- Department of Anesthesiology, Renji Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai 200127, China
| | - Jie Tian
- Department of Anesthesiology, Renji Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai 200127, China
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Dunn J, Liu Y, Banov F, Denison S, Banov D. A topical naltrexone formulation for surgical wound healing: A case report. J Cosmet Dermatol 2020; 20:838-841. [PMID: 32652808 DOI: 10.1111/jocd.13604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 07/04/2020] [Indexed: 10/23/2022]
Abstract
BACKGROUND In current guidelines, there is no specific therapeutic recommendation for promoting surgical wound healing. Proper postsurgical wound care regimen can speed up wound healing and prevent abnormal scarring. AIMS The purpose of this case study was to evaluate the effectiveness of a compounded topical formulation containing naltrexone in managing surgical wound in a patient after Mohs micrographic surgery (MMS). PATIENTS/METHODS A patient started to apply the topical naltrexone formulation two days after the MMS on his hand. Images of the wound and a Patient Scar Assessment Questionnaire (PSAQ) were used to evaluate the clinical outcomes. RESULTS The wound completely healed, and the hand function was fully recovered following application of the formulation for 2 weeks. No abnormal scarring was formed, and the scar was only slightly noticeable after 2 months. CONCLUSION This case study demonstrated the effectiveness of the topical naltrexone formulation in surgical wound management.
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Affiliation(s)
- Jack Dunn
- Jasper Drug Store, Jasper, Georgia, USA
| | - Yi Liu
- Research and Development Department, Professional Compounding Center of America (PCCA), Houston, Texas, USA
| | - Fabiana Banov
- Formulations, Professional Compounding Center of America (PCCA), Houston, Texas, USA
| | - Sebastian Denison
- Clinical Services, Professional Compounding Center of America (PCCA), Houston, Texas, USA
| | - Daniel Banov
- Research and Development Department, Professional Compounding Center of America (PCCA), Houston, Texas, USA
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Titunick MB, Lewis GS, Cain JD, Zagon IS, McLaughlin PJ. Blockade of the OGF-OGFr pathway in diabetic bone. Connect Tissue Res 2019; 60:521-529. [PMID: 30931654 DOI: 10.1080/03008207.2019.1593396] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Purpose: This research investigated the presence and integrity of the opioid growth factor (OGF)-opioid growth factor receptor (OGFr) regulatory pathway in type 1 diabetic (T1D) rats, and investigated whether modulation of this axis by naltrexone (NTX) altered the composition of normal bone or fractured femurs. Materials and Methods: Diabetes was induced by streptozotocin; controls rats received buffer. Hyperglycemic animals were subjected to femur osteotomy, with randomized cohorts receiving either topical NTX or sterile saline in calcium carbonate. In experiment 2, hyperglycemic rats were injected daily for 3 weeks with either 30 mg/kg NTX or sterile saline. Expression levels of OGF and OGFr were measured by immunohistochemistry, bone composition was assessed by histomorphometry, and bone integrity was evaluated by µCT and 3-point bending. Results: Relative to normoglycemic bones, OGF and OGFr expression levels were increased 95% and 84%, respectively, in T1D bone; serum levels of OGF in T1D rats were elevated 23%. Hyperglycemia decreased the strength (26%), osteocalcin expression (17%), and number of proliferative (Ki67+) cells (32%) in intact femur. Topical NTX treatment of fractured femurs reduced the percentage of granulation tissue and increased cartilage. Systemic NTX treatment of diabetic rats increased strength by 21% and energy absorbed by105% in bone relative to measurements in saline-treated diabetic rats. Conclusions: The OGF-OGFr pathway appears to be dysregulated in the bone of T1D rats. Topical NTX treatment of T1D fractured bone accelerated some aspects of delayed diabetic fracture repair, and systemic NTX protected against some elements of compromised bone composition.
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Affiliation(s)
- Michelle B Titunick
- Hackensack-Meridian School of Medicine, Seton Hall University , Nutley , NJ , USA
| | - Gregory S Lewis
- Department of Orthopaedics and Rehabilitation, Penn State Milton S. Hershey Medical Center , Hershey , PA , USA
| | - Jarrett D Cain
- Department of Orthopaedics and Rehabilitation, Penn State Milton S. Hershey Medical Center , Hershey , PA , USA
| | - Ian S Zagon
- Department of Neural & Behavioral Sciences, Penn State University College of Medicine , Hershey , PA , USA
| | - Patricia J McLaughlin
- Department of Neural & Behavioral Sciences, Penn State University College of Medicine , Hershey , PA , USA
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Lie MRKL, van der Giessen J, Fuhler GM, de Lima A, Peppelenbosch MP, van der Ent C, van der Woude CJ. Low dose Naltrexone for induction of remission in inflammatory bowel disease patients. J Transl Med 2018. [PMID: 29523156 PMCID: PMC5845217 DOI: 10.1186/s12967-018-1427-5] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
BACKGROUND Around 30% of patients with inflammatory bowel disease (IBD) are refractory to current IBD drugs or relapse over time. Novel treatments are called for, and low dose Naltrexone (LDN) may provide a safe, easily accessible alternative treatment option for these patients. We investigated the potential of LDN to induce clinical response in therapy refractory IBD patients, and investigated its direct effects on epithelial barrier function. METHODS Patients not in remission and not responding to conventional therapy were offered to initiate LDN as a concomitant treatment. In total 47 IBD patients prescribed LDN were followed prospectively for 12 weeks. Where available, endoscopic remission data, serum and biopsies were collected. Further the effect of Naltrexone on wound healing (scratch assay), cytokine production and endoplasmic reticulum (ER) stress (GRP78 and CHOP western blot analysis, immunohistochemistry) were investigated in HCT116 and CACO2 intestinal epithelial cells, human IBD intestinal organoids and patient samples. RESULTS Low dose Naltrexone induced clinical improvement in 74.5%, and remission in 25.5% of patients. Naltrexone improved wound healing and reduced ER stress induced by Tunicamycin, lipopolysaccharide or bacteria in epithelial barriers. Inflamed mucosa from IBD patients showed high ER stress levels, which was reduced in patients treated with LDN. Cytokine levels in neither epithelial cells nor serum from IBD patients were affected. CONCLUSIONS Naltrexone directly improves epithelial barrier function by improving wound healing and reducing mucosal ER stress levels. Low dose Naltrexone treatment is effective and safe, and could be considered for the treatment of therapy refractory IBD patients.
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Affiliation(s)
- Mitchell R K L Lie
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Centre Rotterdam, s Gravendijkwal 230, 3015 CE, Rotterdam, The Netherlands
| | - Janine van der Giessen
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Centre Rotterdam, s Gravendijkwal 230, 3015 CE, Rotterdam, The Netherlands
| | - Gwenny M Fuhler
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Centre Rotterdam, s Gravendijkwal 230, 3015 CE, Rotterdam, The Netherlands
| | - Alison de Lima
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Centre Rotterdam, s Gravendijkwal 230, 3015 CE, Rotterdam, The Netherlands
| | - Maikel P Peppelenbosch
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Centre Rotterdam, s Gravendijkwal 230, 3015 CE, Rotterdam, The Netherlands
| | - Cokkie van der Ent
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Centre Rotterdam, s Gravendijkwal 230, 3015 CE, Rotterdam, The Netherlands
| | - C Janneke van der Woude
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Centre Rotterdam, s Gravendijkwal 230, 3015 CE, Rotterdam, The Netherlands.
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12
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He J, Pham TL, Kakazu A, Bazan HEP. Recovery of Corneal Sensitivity and Increase in Nerve Density and Wound Healing in Diabetic Mice After PEDF Plus DHA Treatment. Diabetes 2017; 66:2511-2520. [PMID: 28592408 PMCID: PMC5566302 DOI: 10.2337/db17-0249] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Accepted: 05/31/2017] [Indexed: 12/26/2022]
Abstract
Diabetic keratopathy decreases corneal sensation and tear secretion and delays wound healing after injury. In the current study, we tested the effect of treatment with pigment epithelium-derived factor (PEDF) in combination with docosahexaenoic acid (DHA) on corneal nerve regeneration in a mouse model of diabetes with or without corneal injury. The study was performed in streptozotocin-induced diabetic mice (C57BL/6). Ten weeks after streptozotocin injection, diabetic mice showed significant decreases of corneal sensitivity, tear production, and epithelial subbasal nerve density when compared with age-matched normal mice. After diabetic mice were wounded in the right eye and treated in both eyes with PEDF+DHA for 2 weeks, there was a significant increase in corneal epithelial nerve regeneration and substance P-positive nerve density in both wounded and unwounded eyes compared with vehicle-treated corneas. There also was elevated corneal sensitivity and tear production in the treated corneas compared with vehicle. In addition, PEDF+DHA accelerated corneal wound healing, selectively recruited type 2 macrophages, and prevented neutrophil infiltration in diabetic wounded corneas. These results suggest that topical treatment with PEDF+DHA promotes corneal nerve regeneration and wound healing in diabetic mice and could potentially be exploited as a therapeutic option for the treatment of diabetic keratopathy.
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Affiliation(s)
- Jiucheng He
- Neuroscience Center of Excellence and Department of Ophthalmology, School of Medicine, Louisiana State University Health Sciences Center New Orleans, New Orleans, LA
| | - Thang Luong Pham
- Neuroscience Center of Excellence and Department of Ophthalmology, School of Medicine, Louisiana State University Health Sciences Center New Orleans, New Orleans, LA
| | - Azucena Kakazu
- Neuroscience Center of Excellence and Department of Ophthalmology, School of Medicine, Louisiana State University Health Sciences Center New Orleans, New Orleans, LA
| | - Haydee E P Bazan
- Neuroscience Center of Excellence and Department of Ophthalmology, School of Medicine, Louisiana State University Health Sciences Center New Orleans, New Orleans, LA
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13
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McLaughlin PJ, Cain JD, Titunick MB, Sassani JW, Zagon IS. Topical Naltrexone Is a Safe and Effective Alternative to Standard Treatment of Diabetic Wounds. Adv Wound Care (New Rochelle) 2017; 6:279-288. [PMID: 28894635 PMCID: PMC5592845 DOI: 10.1089/wound.2016.0725] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2017] [Accepted: 03/13/2017] [Indexed: 01/14/2023] Open
Abstract
Objective: Diabetes affects more than 29 million individuals in the United States, resulting in healthcare costs approaching $245 billion. Approximately 15% of these individuals will develop a chronic, non-healing foot ulcer (diabetic foot ulcer [DFU]) that, if untreated, may lead to amputation. The current treatments for DFU are expensive, have significant side-effects, and often result in non-compliance. A new topical treatment is described that accelerates cutaneous wound repair and is disease modifying by targeting underlying aberrant diabetic pathways. Approach: The efficacy of naltrexone (NTX), an opioid receptor antagonist, and Regranex® was compared in preclinical studies using type 1 diabetic rats. Dorsal cutaneous wounds were treated topically with 0.03% NTX, Regranex, or moisturizing cream alone. Wound closure, DNA synthesis, and cytokine production were monitored. Results: Wound closure rates with topical NTX in type 1 diabetic rats were comparable to Regranex. Topical NTX accelerated DNA synthesis, as measured by BrdU incorporation, increased mast cells, and enhanced expression of platelet-derived growth factor (PDGF) and vascular endothelial growth factor (VEGF), a marker for angiogenesis. Regranex had little effect on DNA synthesis, mast cells, and VEGF expression relative to vehicle-treated wounds, and it only temporarily increased PDGF expression. Fibroblast growth factor expression was not altered by either treatment. Innovation: Topical application of 0.03% NTX cream accelerates diabetic wound closure. Conclusion: Blockade of the opioid growth factor (OGF)-OGF receptor (OGFr) axis utilizing 0.03% NTX cream is comparable to standard care in preclinical studies, and it provides a safe, inexpensive, and effective alternative for treatment of diabetic wounds.
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Affiliation(s)
- Patricia J. McLaughlin
- Department of Neural and Behavioral Sciences, Penn State University College of Medicine, Hershey, Pennsylvania
| | - Jarrett D. Cain
- Department of Orthopaedics and Rehabilitative Medicine, Penn State University College of Medicine, Hershey, Pennsylvania
| | - Michelle B. Titunick
- Department of Neural and Behavioral Sciences, Penn State University College of Medicine, Hershey, Pennsylvania
| | - Joseph W. Sassani
- Department of Ophthalmology, Penn State University College of Medicine, Hershey, Pennsylvania
| | - Ian S. Zagon
- Department of Neural and Behavioral Sciences, Penn State University College of Medicine, Hershey, Pennsylvania
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Abstract
Gut homeostasis plays an important role in maintaining animal and human health. The disruption of gut homeostasis has been shown to be associated with multiple diseases. The mutually beneficial relationship between the gut microbiota and the host has been demonstrated to maintain homeostasis of the mucosal immunity and preserve the integrity of the gut epithelial barrier. Currently, rapid progress in the understanding of the host-microbial interaction has redefined toxicological pathology of opioids and their pharmacokinetics. However, it is unclear how opioids modulate the gut microbiome and metabolome. Our study, showing opioid modulation of gut homeostasis in mice, suggests that medical interventions to ameliorate the consequences of drug use/abuse will provide potential therapeutic and diagnostic strategies for opioid-modulated intestinal infections. The study of morphine's modulation of the gut microbiome and metabolome will shed light on the toxicological pathology of opioids and its role in the susceptibility to infectious diseases.
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Affiliation(s)
- Fuyuan Wang
- 1 Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, Saint Paul, Minnesota, USA
| | - Sabita Roy
- 1 Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, Saint Paul, Minnesota, USA.,2 Department of Surgery, Medical School, University of Minnesota, Minneapolis, Minnesota, USA
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15
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Sassani JW, Mc Laughlin PJ, Zagon IS. The Yin and Yang of the Opioid Growth Regulatory System: Focus on Diabetes-The Lorenz E. Zimmerman Tribute Lecture. J Diabetes Res 2016; 2016:9703729. [PMID: 27703986 PMCID: PMC5039296 DOI: 10.1155/2016/9703729] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Accepted: 04/24/2016] [Indexed: 12/16/2022] Open
Abstract
The Opioid Growth Regulatory System consists of opioid growth factor (OGF), [Met5]-enkephalin, and its unique receptor (OGFr). OGF inhibits cell division when bound to OGFr. Conversely, blockade of the interaction of OGF and OGFr, using the potent, long-acting opioid receptor antagonist, naltrexone (NTX), results in increased DNA synthesis and cell division. The authors have demonstrated both in vitro and in vivo that the addition of exogenous OGF or an increase in available OGFr decreases corneal epithelial cell division and wound healing. Conversely, blockade of the OGF-OGFr interaction by NTX or a decrease in the production of the OGFr increases corneal epithelial cell division and facilitates corneal epithelial wound healing. The authors also have demonstrated that depressed corneal and cutaneous wound healing, dry eye, and abnormal corneal sensitivity in type 1 and type 2 diabetes in animals can be reversed by OGF-OGFr blockade by NTX. Thus, the function of the Opioid Growth Regulatory System appears to be disordered in diabetic animals, and its function can be restored with NTX treatment. These studies suggest a fundamental role for the Opioid Growth Regulatory System in the pathobiology of diabetic complications and a need for studies to elucidate this role further.
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Affiliation(s)
- Joseph W. Sassani
- Departments of Ophthalmology and Pathology, Penn State Milton S. Hershey Medical Center, Hershey, PA 17033, USA
| | - Patricia J. Mc Laughlin
- Department of Neural and Behavioral Sciences, The Penn State University College of Medicine, Hershey, PA 17033, USA
| | - Ian S. Zagon
- Department of Neural and Behavioral Sciences, The Penn State University College of Medicine, Hershey, PA 17033, USA
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Bigliardi PL, Dancik Y, Neumann C, Bigliardi‐Qi M. Opioids and skin homeostasis, regeneration and ageing – What's the evidence? Exp Dermatol 2016; 25:586-91. [DOI: 10.1111/exd.13021] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/04/2016] [Indexed: 12/18/2022]
Affiliation(s)
- Paul L. Bigliardi
- YLL School of Medicine National University Singapore Singapore
- Division of Rheumatology University Medicine Cluster National University Hospital Singapore
- Experimental Dermatology Institute of Medical Biology Agency for Science Technology & Research (A*STAR) Singapore
| | - Yuri Dancik
- Experimental Dermatology Institute of Medical Biology Agency for Science Technology & Research (A*STAR) Singapore
| | - Christine Neumann
- Experimental Dermatology Institute of Medical Biology Agency for Science Technology & Research (A*STAR) Singapore
| | - Mei Bigliardi‐Qi
- Experimental Dermatology Institute of Medical Biology Agency for Science Technology & Research (A*STAR) Singapore
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18
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McLaughlin PJ, Zagon IS. Duration of opioid receptor blockade determines biotherapeutic response. Biochem Pharmacol 2015; 97:236-46. [DOI: 10.1016/j.bcp.2015.06.016] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Accepted: 06/17/2015] [Indexed: 12/20/2022]
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Abstract
This paper is the thirty-sixth consecutive installment of the annual review of research concerning the endogenous opioid system. It summarizes papers published during 2013 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular topics that continue to be covered include the molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors related to behavior, and the roles of these opioid peptides and receptors in pain and analgesia; stress and social status; tolerance and dependence; learning and memory; eating and drinking; alcohol and drugs of abuse; sexual activity and hormones, pregnancy, development and endocrinology; mental illness and mood; seizures and neurologic disorders; electrical-related activity and neurophysiology; general activity and locomotion; gastrointestinal, renal and hepatic functions; cardiovascular responses; respiration and thermoregulation; and immunological responses.
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and Neuropsychology Doctoral Sub-Program, Queens College, City University of New York, Flushing, NY 11367, United States.
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Zhang J, Li L, Li J, Liu Y, Zhang CY, Zhang Y, Zen K. Protein tyrosine phosphatase 1B impairs diabetic wound healing through vascular endothelial growth factor receptor 2 dephosphorylation. Arterioscler Thromb Vasc Biol 2014; 35:163-74. [PMID: 25395617 DOI: 10.1161/atvbaha.114.304705] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Impaired wound healing is a major complication of diabetes mellitus. The mechanisms that govern wound healing, however, are complex and incompletely understood. In the present study, we determined the inhibitory role of protein tyrosine phosphatase 1B (PTP1B) in the process of diabetic wound healing. APPROACH AND RESULTS First, by comparing the wound healing process in PTP1B knockout (PTP1B(-/-)) mice, ob/ob mice and their wild-type littermates in the presence or absence of streptozotocin treatment, we showed that the inhibition of mouse wound healing in streptozotocin-induced diabetic conditions is because of the upregulation and activation of PTP1B. Second, the impaired wound healing in ob/ob mice and streptozotocin-treated wild-type mice was rescued by a PTP1B inhibitor. Third, PTP1B, which is upregulated under hyperglycemic condition, inhibited the tube formation, proliferation, and migration of human microvascular endothelial cells induced by vascular endothelial growth factor, whereas this inhibition was largely abolished by the PTP1B inhibitor. Finally, mechanism study further indicated that PTP1B likely suppressed the proliferation, migration, and tube formation of vascular endothelial cells through dephosphorylation of vascular endothelial growth factor receptor 2. CONCLUSIONS Our study demonstrated that PTP1B negatively modulated the diabetic wound healing process by dephosphorylating the endothelial cell vascular endothelial growth factor receptor 2 and that the specific inhibitor of PTP1B might serve as a potential novel therapeutic tool for diabetic wound healing.
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Affiliation(s)
- Jing Zhang
- From the State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China (J.Z., L.L., J.L., C.-Y.Z., Y.Z., K.Z.); and Department of Biology, Center for Inflammation, Immunity and Infection, Georgia State University, Atlanta (Y.L.)
| | - Limin Li
- From the State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China (J.Z., L.L., J.L., C.-Y.Z., Y.Z., K.Z.); and Department of Biology, Center for Inflammation, Immunity and Infection, Georgia State University, Atlanta (Y.L.)
| | - Jing Li
- From the State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China (J.Z., L.L., J.L., C.-Y.Z., Y.Z., K.Z.); and Department of Biology, Center for Inflammation, Immunity and Infection, Georgia State University, Atlanta (Y.L.)
| | - Yuan Liu
- From the State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China (J.Z., L.L., J.L., C.-Y.Z., Y.Z., K.Z.); and Department of Biology, Center for Inflammation, Immunity and Infection, Georgia State University, Atlanta (Y.L.)
| | - Chen-Yu Zhang
- From the State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China (J.Z., L.L., J.L., C.-Y.Z., Y.Z., K.Z.); and Department of Biology, Center for Inflammation, Immunity and Infection, Georgia State University, Atlanta (Y.L.).
| | - Yujing Zhang
- From the State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China (J.Z., L.L., J.L., C.-Y.Z., Y.Z., K.Z.); and Department of Biology, Center for Inflammation, Immunity and Infection, Georgia State University, Atlanta (Y.L.).
| | - Ke Zen
- From the State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu, China (J.Z., L.L., J.L., C.-Y.Z., Y.Z., K.Z.); and Department of Biology, Center for Inflammation, Immunity and Infection, Georgia State University, Atlanta (Y.L.).
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Immonen JA, Zagon IS, McLaughlin PJ. Featured Article: Selective blockade of the OGF–OGFr pathway by naltrexone accelerates fibroblast proliferation and wound healing. Exp Biol Med (Maywood) 2014; 239:1300-9. [DOI: 10.1177/1535370214543061] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Naltrexone (NTX) is an opioid receptor antagonist that acts at classical and non-classical opioid receptors including the opioid growth factor receptor (OGFr). Animal models of type 1 and type 2 diabetes, as well as normal rodents, have shown that topical NTX enhances the healing rates of corneal epithelium and full-thickness cutaneous wounds. The mechanism of this general opioid antagonist on growth, and in particular the specific receptor pathway involved, is not understood. Tissue culture studies using NIH 3T3 fibroblasts and primary rat auricular fibroblasts were established to evaluate growth following opioid receptor antagonist treatment. Treatment of cells with CTOP, naltrindole, or nalmefene, selective antagonists for mu, delta, and kappa opioid receptors, respectively, did not accelerate cell replication. Addition of the classical opioid receptor peptides DAMGO, DPDPE, or EKC did not alter cell growth, suggesting that the classical opioid receptors were not involved in cutaneous wound healing. However, NTX (10−6 M) increased the growth of NIH 3T3 fibroblasts in culture over a 96-h period, and the specific ligand OGF decreased cell growth, supporting that the OGF-OGFr axis is tonically active and constitutively expressed in fibroblasts, the primary cell type in granulation tissue of the skin. Transfection of NIH 3T3 cells with OGFr siRNA reduced receptor protein; subsequent treatment with NTX did not accelerate cell proliferation. These data indicate that blockade of the OGFr pathway enhances proliferation of fibroblasts in vitro, and in a primary culture of auricular fibroblasts, suggesting that the effect of NTX on growth is mediated through the OGF-OGFr axis. Finally, antagonists for classical opioid receptors as well as NTX were topically applied to cutaneous wounds in type 1 diabetic rats; only NTX accelerated wound closure. These studies indicate that the mechanistic pathway underlying the effects of NTX to enhance cutaneous wound closure in diabetic and nondiabetic subjects is specific blockade of the OGF–OGFr regulatory axis.
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Affiliation(s)
- Jessica A Immonen
- Department of Neural & Behavioral Sciences, The Pennsylvania State University College of Medicine, Hershey, PY 17033, USA
| | - Ian S Zagon
- Department of Neural & Behavioral Sciences, The Pennsylvania State University College of Medicine, Hershey, PY 17033, USA
| | - Patricia J McLaughlin
- Department of Neural & Behavioral Sciences, The Pennsylvania State University College of Medicine, Hershey, PY 17033, USA
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Immonen JA, Zagon IS, McLaughlin PJ. Topical Naltrexone as Treatment for Type 2 Diabetic Cutaneous Wounds. Adv Wound Care (New Rochelle) 2014; 3:419-427. [PMID: 24940556 PMCID: PMC4048970 DOI: 10.1089/wound.2014.0543] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Accepted: 04/09/2014] [Indexed: 11/13/2022] Open
Abstract
Objective: Type 2 diabetes (T2D) is associated with impaired cutaneous wound healing and can result in ulceration, infection, and/or amputation. More than 25 million people in the United States have T2D and are vulnerable to epithelial-related complications. Current therapies are limited in their efficacy. New treatments for full-thickness cutaneous wounds that focus on underlying diabetic pathways are needed. Approach: Topical application of the opioid receptor antagonist naltrexone (NTX) dissolved in cream reverses delayed wound closure in type 1 diabetic rat by the acceleration of reepithelialization and enhancement of angiogenesis and remodeling. NTX blocks the opioid growth factor (OGF)-OGF receptor (OGFr) axis and upregulates DNA synthesis and cell proliferation. To investigate whether NTX is an effective therapy for T2D wound closure, genetically obese mice (db/db) and normal C57Bl/6J mice received full-thickness cutaneous wounds. Wounds (5 mm in diameter) were treated topically three times daily with 10-5 M NTX or sterile saline dissolved in cream and photographed every 2 days. Results: Wounds in db/db mice treated with saline were 11-92% larger than those in normal mice throughout the 2-week observation. Topical NTX therapy in T2D mice reduced the residual wound size by 13-30% between days 8 and 14 relative to diabetic mice receiving saline. Reepithelialization and DNA synthesis, as analyzed by epithelial thickness and BrdU labeling indexes, respectively, were accelerated in NTX-treated wounds. Innovation and Conclusion: These data suggest that the OGF-OGFr axis plays a role in epithelial-related complications of T2D and that blockade of this pathway by NTX may be an effective treatment for wound repair.
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Affiliation(s)
- Jessica A. Immonen
- Department of Neural and Behavioral Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania
| | - Ian S. Zagon
- Department of Neural and Behavioral Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania
| | - Patricia J. McLaughlin
- Department of Neural and Behavioral Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania
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