1
|
Russu E, Arbanasi EM, Chirila TV, Muresan AV. Therapeutic strategies based on non-ionizing radiation to prevent venous neointimal hyperplasia: the relevance for stenosed arteriovenous fistula, and the role of vascular compliance. Front Cardiovasc Med 2024; 11:1356671. [PMID: 38374996 PMCID: PMC10875031 DOI: 10.3389/fcvm.2024.1356671] [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: 12/18/2023] [Accepted: 01/23/2024] [Indexed: 02/21/2024] Open
Abstract
We have reviewed the development and current status of therapies based on exposure to non-ionizing radiation (with a photon energy less than 10 eV) aimed at suppressing the venous neointimal hyperplasia, and consequentially at avoiding stenosis in arteriovenous grafts. Due to the drawbacks associated with the medical use of ionizing radiation, prominently the radiation-induced cardiovascular disease, the availability of procedures using non-ionizing radiation is becoming a noteworthy objective for the current research. Further, the focus of the review was the use of such procedures for improving the vascular access function and assuring the clinical success of arteriovenous fistulae in hemodialysis patients. Following a brief discussion of the physical principles underlying radiotherapy, the current methods based on non-ionizing radiation, either in use or under development, were described in detail. There are currently five such techniques, including photodynamic therapy (PDT), far-infrared therapy, photochemical tissue passivation (PTP), Alucent vascular scaffolding, and adventitial photocrosslinking. The last three are contingent on the mechanical stiffening achievable by the exogenous photochemical crosslinking of tissular collagen, a process that leads to the decrease of venous compliance. As there are conflicting opinions on the role of compliance mismatch between arterial and venous conduits in a graft, this aspect was also considered in our review.
Collapse
Affiliation(s)
- Eliza Russu
- Clinic of Vascular Surgery, Mures County Emergency Hospital, Targu Mures, Romania
- Department of Vascular Surgery, George Emil Palade University of Medicine, Pharmacy, Sciences and Technology of Targu Mures, Targu Mures, Romania
| | - Emil-Marian Arbanasi
- Clinic of Vascular Surgery, Mures County Emergency Hospital, Targu Mures, Romania
- Department of Vascular Surgery, George Emil Palade University of Medicine, Pharmacy, Sciences and Technology of Targu Mures, Targu Mures, Romania
- Doctoral School of Medicine and Pharmacy, George Emil Palade University of Medicine, Pharmacy, Sciences and Technology of Targu Mures, Targu Mures, Romania
- Centre for Advanced Medical and Pharmaceutical Research (CCAMF), George Emil Palade University of Medicine, Pharmacy, Sciences and Technology of Targu Mures, Targu Mures, Romania
| | - Traian V. Chirila
- Centre for Advanced Medical and Pharmaceutical Research (CCAMF), George Emil Palade University of Medicine, Pharmacy, Sciences and Technology of Targu Mures, Targu Mures, Romania
- Queensland Eye Institute, Woolloongabba, QLD, Australia
- Faculty of Medicine, George Emil Palade University of Medicine, Pharmacy, Sciences and Technology of Targu Mures, Targu Mures, Romania
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, QLD, Australia
- Australian Institute of Bioengineering and Nanotechnology (AIBN), University of Queensland, St Lucia, QLD, Australia
| | - Adrian V. Muresan
- Clinic of Vascular Surgery, Mures County Emergency Hospital, Targu Mures, Romania
- Department of Vascular Surgery, George Emil Palade University of Medicine, Pharmacy, Sciences and Technology of Targu Mures, Targu Mures, Romania
| |
Collapse
|
2
|
Li Y, Zheng X, Guo J, Samura M, Ge Y, Zhao S, Li G, Chen X, Shoji T, Ikezoe T, Miyata M, Xu B, Dalman RL. Treatment With Small Molecule Inhibitors of Advanced Glycation End-Products Formation and Advanced Glycation End-Products-Mediated Collagen Cross-Linking Promotes Experimental Aortic Aneurysm Progression in Diabetic Mice. J Am Heart Assoc 2023; 12:e028081. [PMID: 37158066 PMCID: PMC10227285 DOI: 10.1161/jaha.122.028081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 04/14/2023] [Indexed: 05/10/2023]
Abstract
Background Although diabetes attenuates abdominal aortic aneurysms (AAAs), the mechanisms by which diabetes suppresses AAAs remain incompletely understood. Accumulation of advanced glycation end- (AGEs) reduces extracellular matrix (ECM) degradation in diabetes. Because ECM degradation is critical for AAA pathogenesis, we investigated whether AGEs mediate experimental AAA suppression in diabetes by blocking AGE formation or disrupting AGE-ECM cross-linking using small molecule inhibitors. Methods and Results Male C57BL/6J mice were treated with streptozotocin and intra-aortic elastase infusion to induce diabetes and experimental AAAs, respectively. Aminoguanidine (AGE formation inhibitor, 200 mg/kg), alagebrium (AGE-ECM cross-linking disrupter, 20 mg/kg), or vehicle was administered daily to mice from the last day following streptozotocin injection. AAAs were assessed via serial aortic diameter measurements, histopathology, and in vitro medial elastolysis assays. Treatment with aminoguanidine, not alagebrium, diminished AGEs in diabetic AAAs. Treatment with both inhibitors enhanced aortic enlargement in diabetic mice as compared with vehicle treatment. Neither enhanced AAA enlargement in nondiabetic mice. AAA enhancement in diabetic mice by aminoguanidine or alagebrium treatment promoted elastin degradation, smooth muscle cell depletion, mural macrophage accumulation, and neoangiogenesis without affecting matrix metalloproteinases, C-C motif chemokine ligand 2, or serum glucose concentration. Additionally, treatment with both inhibitors reversed suppression of diabetic aortic medial elastolysis by porcine pancreatic elastase in vitro. Conclusions Inhibiting AGE formation or AGE-ECM cross-linking enhances experimental AAAs in diabetes. These findings support the hypothesis that AGEs attenuate experimental AAAs in diabetes. These findings underscore the potential translational value of enhanced ECM cross-linking as an inhibitory strategy for early AAA disease.
Collapse
Affiliation(s)
- Yankui Li
- Department of SurgeryStanford University School of MedicineStanfordCAUSA
- Department of Vascular SurgeryTianjin Medical University Second HospitalTianjinChina
| | - Xiaoya Zheng
- Department of SurgeryStanford University School of MedicineStanfordCAUSA
- Department of EndocrinologyThe First Affiliated Hospital of Chongqing Medical UniversityChongqingChina
| | - Jia Guo
- Department of SurgeryStanford University School of MedicineStanfordCAUSA
| | - Makoto Samura
- Department of SurgeryStanford University School of MedicineStanfordCAUSA
| | - Yingbin Ge
- Department of PhysiologyNanjing Medical UniversityNanjingChina
| | - Sihai Zhao
- Department of SurgeryStanford University School of MedicineStanfordCAUSA
| | - Gang Li
- Department of SurgeryStanford University School of MedicineStanfordCAUSA
| | - Xiaofeng Chen
- Department of Radiation OncologyIndiana University School of MedicineIndianapolisINUSA
| | - Takahiro Shoji
- Department of SurgeryStanford University School of MedicineStanfordCAUSA
| | - Toru Ikezoe
- Department of SurgeryStanford University School of MedicineStanfordCAUSA
| | - Masaaki Miyata
- School of Health SciencesKagoshima University Faculty of MedicineKagoshimaJapan
| | - Baohui Xu
- Department of SurgeryStanford University School of MedicineStanfordCAUSA
| | - Ronald L. Dalman
- Department of SurgeryStanford University School of MedicineStanfordCAUSA
| |
Collapse
|
3
|
He Y, Anderson B, Hu Q, Hayes RB, Huff K, Isaacson J, Warner KS, Hauser H, Greenberg M, Chandra V, Kauser K, Berceli SA. Photochemically Aided Arteriovenous Fistula Creation to Accelerate Fistula Maturation. Int J Mol Sci 2023; 24:ijms24087571. [PMID: 37108733 PMCID: PMC10142855 DOI: 10.3390/ijms24087571] [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: 02/23/2023] [Revised: 04/10/2023] [Accepted: 04/13/2023] [Indexed: 04/29/2023] Open
Abstract
Rates of arteriovenous fistula maturation failure are still high, especially when suboptimal size veins are used. During successful maturation, the vein undergoes lumen dilatation and medial thickening, adapting to the increased hemodynamic forces. The vascular extracellular matrix plays an important role in regulating these adaptive changes and may be a target for promoting fistula maturation. In this study, we tested whether a device-enabled photochemical treatment of the vein prior to fistula creation facilitates maturation. Sheep cephalic veins were treated using a balloon catheter coated by a photoactivatable molecule (10-8-10 Dimer) and carrying an internal light fiber. As a result of the photochemical reaction, new covalent bonds were created during light activation among oxidizable amino acids of the vein wall matrix proteins. The treated vein lumen diameter and media area became significantly larger than the contralateral control fistula vein at 1 week (p = 0.035 and p = 0.034, respectively). There was also a higher percentage of proliferating smooth muscle cells in the treated veins than in the control veins (p = 0.029), without noticeable intimal hyperplasia. To prepare for the clinical testing of this treatment, we performed balloon over-dilatation of isolated human veins and found that veins can tolerate up to 66% overstretch without notable histological damage.
Collapse
Affiliation(s)
- Yong He
- Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, University of Florida, Gainesville, FL 32611, USA
| | | | - Qiongyao Hu
- Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, University of Florida, Gainesville, FL 32611, USA
| | - R B Hayes
- Alucent Biomedical Inc., Salt Lake City, UT 84108, USA
| | - Kenji Huff
- Alucent Biomedical Inc., Salt Lake City, UT 84108, USA
| | - Jim Isaacson
- Alucent Biomedical Inc., Salt Lake City, UT 84108, USA
| | | | - Hank Hauser
- Alucent Biomedical Inc., Salt Lake City, UT 84108, USA
| | | | - Venita Chandra
- Division of Vascular Surgery, Department of Surgery, Stanford University, Stanford, CA 94305, USA
| | | | - Scott A Berceli
- Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, University of Florida, Gainesville, FL 32611, USA
- North Florida/South Georgia Veterans Health System, Gainesville, FL 32608, USA
| |
Collapse
|
4
|
Kauser K, Warner KS, Anderson B, Keyes ED, Hayes RB, Kawamoto E, Perkins DH, Scott R, Isaacson J, Haberer B, Spaans A, Utecht R, Hauser H, Roberts AG, Greenberg M. Creating a Natural Vascular Scaffold by Photochemical Treatment of the Extracellular Matrix for Vascular Applications. Int J Mol Sci 2022; 23:ijms23020683. [PMID: 35054866 PMCID: PMC8775700 DOI: 10.3390/ijms23020683] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 12/30/2021] [Accepted: 01/04/2022] [Indexed: 02/01/2023] Open
Abstract
The development of bioscaffolds for cardiovascular medical applications, such as peripheral artery disease (PAD), remains to be a challenge for tissue engineering. PAD is an increasingly common and serious cardiovascular illness characterized by progressive atherosclerotic stenosis, resulting in decreased blood perfusion to the lower extremities. Percutaneous transluminal angioplasty and stent placement are routinely performed on these patients with suboptimal outcomes. Natural Vascular Scaffolding (NVS) is a novel treatment in the development for PAD, which offers an alternative to stenting by building on the natural structural constituents in the extracellular matrix (ECM) of the blood vessel wall. During NVS treatment, blood vessels are exposed to a photoactivatable small molecule (10-8-10 Dimer) delivered locally to the vessel wall via an angioplasty balloon. When activated with 450 nm wavelength light, this therapy induces the formation of covalent protein–protein crosslinks of the ECM proteins by a photochemical mechanism, creating a natural scaffold. This therapy has the potential to reduce the need for stent placement by maintaining a larger diameter post-angioplasty and minimizing elastic recoil. Experiments were conducted to elucidate the mechanism of action of NVS, including the molecular mechanism of light activation and the impact of NVS on the ECM.
Collapse
Affiliation(s)
- Katalin Kauser
- Alucent Biomedical Inc., 675 Arapeen Dr, Suite #102, Salt Lake City, UT 84108, USA; (K.S.W.); (B.A.); (R.H.); (E.K.); (D.P.); (R.S.); (J.I.); (H.H.); (M.G.)
- Correspondence: ; Tel.: +1-415-527-9892
| | - Kevin S. Warner
- Alucent Biomedical Inc., 675 Arapeen Dr, Suite #102, Salt Lake City, UT 84108, USA; (K.S.W.); (B.A.); (R.H.); (E.K.); (D.P.); (R.S.); (J.I.); (H.H.); (M.G.)
| | - Blake Anderson
- Alucent Biomedical Inc., 675 Arapeen Dr, Suite #102, Salt Lake City, UT 84108, USA; (K.S.W.); (B.A.); (R.H.); (E.K.); (D.P.); (R.S.); (J.I.); (H.H.); (M.G.)
| | - Edgar Dalles Keyes
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, UT 84112, USA; (E.D.K.); (A.G.R.)
| | - RB Hayes
- Alucent Biomedical Inc., 675 Arapeen Dr, Suite #102, Salt Lake City, UT 84108, USA; (K.S.W.); (B.A.); (R.H.); (E.K.); (D.P.); (R.S.); (J.I.); (H.H.); (M.G.)
| | - Eric Kawamoto
- Alucent Biomedical Inc., 675 Arapeen Dr, Suite #102, Salt Lake City, UT 84108, USA; (K.S.W.); (B.A.); (R.H.); (E.K.); (D.P.); (R.S.); (J.I.); (H.H.); (M.G.)
| | - DH Perkins
- Alucent Biomedical Inc., 675 Arapeen Dr, Suite #102, Salt Lake City, UT 84108, USA; (K.S.W.); (B.A.); (R.H.); (E.K.); (D.P.); (R.S.); (J.I.); (H.H.); (M.G.)
| | - Robert Scott
- Alucent Biomedical Inc., 675 Arapeen Dr, Suite #102, Salt Lake City, UT 84108, USA; (K.S.W.); (B.A.); (R.H.); (E.K.); (D.P.); (R.S.); (J.I.); (H.H.); (M.G.)
| | - Jim Isaacson
- Alucent Biomedical Inc., 675 Arapeen Dr, Suite #102, Salt Lake City, UT 84108, USA; (K.S.W.); (B.A.); (R.H.); (E.K.); (D.P.); (R.S.); (J.I.); (H.H.); (M.G.)
| | - Barb Haberer
- Alumend, LLC, 4800 N. Career Avenue, Suite #108, Sioux Falls, SD 57107, USA; (B.H.); (A.S.); (R.U.)
| | - Ann Spaans
- Alumend, LLC, 4800 N. Career Avenue, Suite #108, Sioux Falls, SD 57107, USA; (B.H.); (A.S.); (R.U.)
| | - Ronald Utecht
- Alumend, LLC, 4800 N. Career Avenue, Suite #108, Sioux Falls, SD 57107, USA; (B.H.); (A.S.); (R.U.)
| | - Hank Hauser
- Alucent Biomedical Inc., 675 Arapeen Dr, Suite #102, Salt Lake City, UT 84108, USA; (K.S.W.); (B.A.); (R.H.); (E.K.); (D.P.); (R.S.); (J.I.); (H.H.); (M.G.)
| | - Andrew George Roberts
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, UT 84112, USA; (E.D.K.); (A.G.R.)
| | - Myles Greenberg
- Alucent Biomedical Inc., 675 Arapeen Dr, Suite #102, Salt Lake City, UT 84108, USA; (K.S.W.); (B.A.); (R.H.); (E.K.); (D.P.); (R.S.); (J.I.); (H.H.); (M.G.)
| |
Collapse
|
5
|
Kelly LA, Roll M, Joseph J, Seenisamy J, Barrett J, Kauser K, Warner KS. Solvent-Dependent Photophysics and Reactivity of Monomeric and Dimeric 4-Amino-1,8-Naphthalimides. J Phys Chem A 2021; 125:2294-2307. [DOI: 10.1021/acs.jpca.0c11639] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lisa A. Kelly
- Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250 United States
| | - Melissa Roll
- Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250 United States
| | - Jayan Joseph
- Syngene International Ltd., Biocon Park, 560099 Bengaluru, India
| | | | - Justin Barrett
- Alucent Biomedical Inc., 675 Arapeen Drive, Suite 102, Salt Lake City, Utah 84108, United States
| | - Katalin Kauser
- Alucent Biomedical Inc., 675 Arapeen Drive, Suite 102, Salt Lake City, Utah 84108, United States
| | - Kevin S. Warner
- Alucent Biomedical Inc., 675 Arapeen Drive, Suite 102, Salt Lake City, Utah 84108, United States
| |
Collapse
|
6
|
Shiu YT, He Y, Tey JCS, Knysheva M, Anderson B, Kauser K. Natural Vascular Scaffolding Treatment Promotes Outward Remodeling During Arteriovenous Fistula Development in Rats. Front Bioeng Biotechnol 2021; 9:622617. [PMID: 33681159 PMCID: PMC7928390 DOI: 10.3389/fbioe.2021.622617] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 01/25/2021] [Indexed: 12/12/2022] Open
Abstract
Following creation, an arteriovenous fistula (AVF) must mature (i.e., enlarge lumen to allow high blood flow) before being used for hemodialysis. AVF maturation failure rates are high, and currently, there are no effective therapy to treat this problem. The maturation process is likely affected by the integrity of the vascular extracellular matrix (ECM). Natural Vascular Scaffolding (NVS) Therapy is a new technology that interlinks collagen and elastin via photoactivation of a locally delivered small molecule (4-amino-1,8-naphtalamide). We hypothesized that NVS Therapy may improve AVF remodeling by preserving ECM integrity. AVFs were created in Wistar male rats by connecting the femoral vein (end) to femoral artery (side) in the same limb. Immediately after blood flow was restored to dilate the femoral vein by arterial pressure, a 10 μl-drop of the NVS compound (2 mg/ml) was placed on the anastomosis perivascularly. Following 5-min incubation, the NVS treated area was exposed to 1-min illumination by 450-nm light. The control group received 10 μl-drop of phosphate buffered saline (PBS) and the same light activation. The skin was closed, and rats were euthanized 4 weeks (n = 6-9 per group) post-AVF creation for histology, morphometry, immunohistochemistry (IHC), and multiphoton microscopy for second-harmonic-generation evaluation of collagen fibers. The vascular thickness was similar in both groups. The AVF vein's open lumen area and % open lumen area in NVS-treated rats were significantly larger than in PBS-treated rats (4.2-fold p = 0.014 and 2-fold p = 0.009, respectively). The inflammatory markers IL-6 and MMP-9 in the AVF walls were significantly decreased in the NVS group than the PBS group. Collagen fibers in the vascular wall trended toward perpendicular alignment to the lumen circumference in the NVS-treated AVFs, with more defined shape but less area than in the PBS-treated AVFs. These results indicate that the NVS Therapy exerted changes in collagen, which may influence AVF maturation. Rats tolerated the NVS treatment well, and the lack of cell death by the treatment was confirmed in cell culture experiments. These results suggest that NVS treatment is safe and may have therapeutic potential by facilitating lumen expansion to enhanced AVF maturation in patients.
Collapse
Affiliation(s)
- Yan-Ting Shiu
- Division of Nephrology and Hypertension, University of Utah School of Medicine, Salt Lake City, UT, United States.,Veterans Affairs Medical Center, Salt Lake City, UT, United States
| | - Yuxia He
- Division of Nephrology and Hypertension, University of Utah School of Medicine, Salt Lake City, UT, United States
| | - Jason C S Tey
- Division of Nephrology and Hypertension, University of Utah School of Medicine, Salt Lake City, UT, United States
| | - Marina Knysheva
- Division of Nephrology and Hypertension, University of Utah School of Medicine, Salt Lake City, UT, United States
| | - Blake Anderson
- Alucent Biomedical Inc., Salt Lake City, UT, United States
| | - Katalin Kauser
- Alucent Biomedical Inc., Salt Lake City, UT, United States
| |
Collapse
|
7
|
Ansari E, Anderson B, Kauser K. Retained Functionality of Atherosclerotic Human Arteries Following Photoactivated Linking of the Extracellular Matrix by Natural Vascular Scaffolding Treatment. J Cardiovasc Transl Res 2020; 14:441-448. [PMID: 32748207 PMCID: PMC8219574 DOI: 10.1007/s12265-020-10063-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 07/24/2020] [Indexed: 01/08/2023]
Abstract
In this study, we investigated natural vascular scaffolding (NVS) treatment on vascular functionality using freshly isolated human popliteal arteries in vitro. Arteries were exposed to intraluminal NVS treatment consisting of a compound (4 amino-1,8-naphthalimide) photoactivated by a 450-nm light-emitting light fiber placed inside the artery. This procedure results in covalent linking between the extracellular matrix proteins to achieve a larger vessel diameter post-angioplasty and minimizing elastic recoil. Immediately following NVS treatment, rings were cut from the treated arteries and mounted in organ baths for contractility testing in response to U46619 and sodium nitroprusside. We also investigated the effect of NVS treatment on IL-6 cytokine release from vascular rings following a 4-h organoculture post-NVS treatment. Based on our results, we conclude that exposure of the vessels to NVS treatment does not adversely affect the contractile responsiveness of the vascular smooth muscle and exerts no pro-inflammatory effect. Graphical abstract.
Collapse
Affiliation(s)
| | - Blake Anderson
- Alucent Biomedical Inc., 675 Arapeen Dr Ste 102, Salt Lake City, UT, 84108, USA
| | - Katalin Kauser
- Alucent Biomedical Inc., 675 Arapeen Dr Ste 102, Salt Lake City, UT, 84108, USA.
| |
Collapse
|
8
|
Alexandrescu VA, Houbiers A. Commentary: Limb-Based Patency for Chronic Limb-Threatening Ischemia Treatment: Do We Face a Threshold for Redefining Current Revascularization Practice? J Endovasc Ther 2020; 27:595-598. [PMID: 32495681 DOI: 10.1177/1526602820926953] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Vlad-Adrian Alexandrescu
- Cardio-Vascular Department, CHU Sart-Tilman University Hospital Liège, Belgium.,Department of Vascular and General Surgery, Princess Paola Hospital, Vivalia, Marche-en-Famenne, Belgium
| | - Arthur Houbiers
- Department of Vascular and General Surgery, Princess Paola Hospital, Vivalia, Marche-en-Famenne, Belgium
| |
Collapse
|
9
|
Sova S, Kelly LA. Enzyme Modification and Oxidative Cross-linking Using Carboxylate-, Phenol- and Catechol-Conjugated 1,8-Naphthalimides. Photochem Photobiol 2019; 95:1169-1178. [PMID: 30993721 DOI: 10.1111/php.13110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 04/10/2019] [Indexed: 11/27/2022]
Abstract
The ground- and excited-state interactions of β-alanine, tyrosine and l-dopa substituted 1,8 naphthalimides (NI-Ala, NI-Tyr and NI-Dopa) with lysozyme and mushroom tyrosinase were evaluated to understand the mechanism of oxidative modification. Photooxidative cross-linking of lysozyme was observed for all three conjugates. The yield was significantly reduced for NI-Tyr and NI-Dopa due to intramolecular electron transfer to the excited singlet state of the 1,8-naphthalimide. Incubation of NI-Tyr and NI-Dopa with mushroom tyrosinase resulted in an increased fluorescence from the naphthalimide, suggesting that the phenol and catechol portion of the conjugates are oxidized by the enzyme. This result demonstrates that the compounds bind in the active site of mushroom tyrosinase. The catalytic activity of mushroom tyrosinase to oxidize both tyrosine (monophenolase) and l-dopa (diphenolase) was modified by NI-Tyr and NI-Dopa. Monophenolase activity was inhibited, and the diphenolase activity was enhanced in the presence of these conjugates. Detailed Michaelis-Menten studies show that both Vmax and Km are modified, consistent with a mixed inhibition mechanism. Collectively, the results show that the compounds interact in the enzyme's active site, but also modify the distribution of the enzyme's oxidation states that are responsible for catalysis.
Collapse
Affiliation(s)
- Stacey Sova
- Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, MD
| | - Lisa A Kelly
- Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, MD
| |
Collapse
|
10
|
Gu L, Shan T, Ma YX, Tay FR, Niu L. Novel Biomedical Applications of Crosslinked Collagen. Trends Biotechnol 2018; 37:464-491. [PMID: 30447877 DOI: 10.1016/j.tibtech.2018.10.007] [Citation(s) in RCA: 153] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Revised: 10/19/2018] [Accepted: 10/19/2018] [Indexed: 02/08/2023]
Abstract
Collagen is one of the most useful biopolymers because of its low immunogenicity and biocompatibility. The biomedical potential of natural collagen is limited by its poor mechanical strength, thermal stability, and enzyme resistance, but exogenous chemical, physical, or biological crosslinks have been used to modify the molecular structure of collagen to minimize degradation and enhance mechanical stability. Although crosslinked collagen-based materials have been widely used in biomedicine, there is no standard crosslinking protocol that can achieve a perfect balance between stability and functional remodeling of collagen. Understanding the role of crosslinking agents in the modification of collagen performance and their potential biomedical applications are crucial for developing novel collagen-based biopolymers for therapeutic gain.
Collapse
Affiliation(s)
- Lisha Gu
- Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology and Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, PR China
| | - Tiantian Shan
- Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology and Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, PR China
| | - Yu-Xuan Ma
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases and Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China
| | - Franklin R Tay
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases and Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China; The Dental College of Georgia, Augusta University, Augusta, GA, USA.
| | - Lina Niu
- State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases and Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China; The Dental College of Georgia, Augusta University, Augusta, GA, USA.
| |
Collapse
|