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Bakr NM, Balbola GA, Gawad Mohamed NA, Ahmed NA, Sapri AM, Mously EA, Felemban D, Elsayed SA, Hassan S. The effectiveness of Moringa oleifera in the preservation of periodontium after radiation therapy: An experimental animal study. Heliyon 2024; 10:e27495. [PMID: 38510057 PMCID: PMC10950587 DOI: 10.1016/j.heliyon.2024.e27495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 02/28/2024] [Accepted: 02/29/2024] [Indexed: 03/22/2024] Open
Abstract
Background Radiation therapy produces reactive oxygen species, which have been linked to various degenerative conditions in periodontal attachment. This study aimed to assess the beneficial effects of aqueous Moringa oleifera leaf extract on the periodontium of albino rats exposed to fractionated gamma radiation. Materials and methods This experimental study involved 24 adult male albino rats divided into three groups: Group M received M. oleifera leaf extract (300 mg/kg) intraperitoneally for 14 days; Group R received 20 Gy fractionated gamma irradiation; and Group MR received the same M. oleifera regimen as Group M and then fractionated gamma irradiation dose as Group R. On the first and seventh days post-radiation, bone, cementum, and periodontal ligament samples were histologically and histomorphometrically examined. Results The periodontal ligament, alveolar bone, and cementum showed structural damage in Group R. A relative persistence of normal periodontal tissue structures was seen in Group MR, showing less disruption of the periodontal ligament and greater trabecular bone thickness than Group R. The histomorphometric analysis showed that the mean periodontal ligament width was highest in Group R7 (245.20 μm) and lowest in Group M7 (54.55 μm). In addition, the mean cementum width was highest in Group R1 (88.99 μm) and lowest in Group M1R1 (17.87 μm) and differed significantly between groups. Conclusion Within the limitations of this study, Moringa oleifera leaf aqueous extract showed the potential to reduce the adverse effects of radiation, control inflammation, and support tissue healing in a rat model.
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Affiliation(s)
- Noura Mohammed Bakr
- Department of Oral and Dental Biology, Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt
| | - Gihan A. Balbola
- Department of Oral and Dental Pathology, Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt
| | - Nora Abdel Gawad Mohamed
- Department of Oral Medicine and Periodontology, Diagnosis and Radiology Department, Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt
| | - Nehad A. Ahmed
- Department of Oral and Dental Biology, Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt
| | - Ahmed Mohammed Sapri
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Mansoura University, Egypt
| | - Eihab A. Mously
- Department of Preventive Dental Sciences and Periodontology, College of Dentistry, TaibahUniversity, Saudi Arabia
| | - Doaa Felemban
- Department of Oral and Maxillofacial Diagnostic Sciences, College of Dentistry, Taibah University, Saudi Arabia
| | - Shadia A. Elsayed
- Department of Oral and Dental Biology, Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt
- Department of Oral and Maxillofacial Diagnostic Sciences, College of Dentistry, Taibah University, Saudi Arabia
| | - Sandy Hassan
- Department of Oral Medicine, Periodontology & Oral Diagnosis, Faculty of Dentistry, Fayoum University, Fayoum, Egypt
- Ahram Canadian University (ACU), Egypt
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de Oliveira SV, Dos Reis T, Amorim J, Rocha FS, Marques MM, Guerra ES, Hanna R, Gallo CB. Efficacy of photobiomodulation therapy on healing of ionizing irradiated bone: a systematic review of in vivo animal studies. Lasers Med Sci 2022; 37:3379-3392. [PMID: 36194304 DOI: 10.1007/s10103-022-03649-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 09/22/2022] [Indexed: 12/09/2022]
Abstract
This systematic review aimed to answer the research focused question: What are the effects of photobiomodulation (PBM) therapy on bone healing after ionizing irradiation in animal models? The EMBASE, LILACS, LIVIVO, PubMed, Scopus, and Web of Science databases, including gray literature, were searched using the following keywords: "Head and Neck Neoplasms"; "Ionizing Radiation"; "Low-Level Light Therapy"; and "Bone regeneration", focusing on the primary studies that assessed the effects of PBM therapy on animal models of irradiated bone. Six studies have met the eligibility criteria and presented an overall regular quality according to the risk of bias assessment tools. All the studies utilized rat animal model and near-infrared laser PBM at low power output setting. Most of the studies showed increased new bone formation, osteocytes, osteoblasts, and vascularization networking, as a result of PBM therapy. However, only one out of the six studies has not shown any differences in bone healing in both lased and non-lased animal groups. Nevertheless, PBM therapy is a potential tool to improve bone healing induced by ionizing radiation. However, due to the scarce number of studies and the great variability of laser parameters and treatment protocols, a clear conclusion cannot be drawn. Hence, extensive preclinical in vivo studies are warranted to ensure these beneficial effects have been addressed prior to translational clinical trials.
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Affiliation(s)
- Samanta Vicente de Oliveira
- Department of Stomatology, School of Dentistry of the Universidade de Sao Paulo, Av. Prof. Lineu Prestes, 2227 - Butantã, Sao Paulo, SP, Brazil
| | - Thaís Dos Reis
- Department of Stomatology, School of Dentistry of the Universidade de Sao Paulo, Av. Prof. Lineu Prestes, 2227 - Butantã, Sao Paulo, SP, Brazil
| | - Juliana Amorim
- Laboratory of Oral Histopathology, Health Sciences Faculty of the University of Brasília, Brasilia, DF, Brazil
| | - Flaviana Soares Rocha
- Laboratory of Oral Histopathology, Health Sciences Faculty of the University of Brasília, Brasilia, DF, Brazil
| | - Márcia Martins Marques
- Post Graduation Program, School of Dentistry, Ibirapuera University, Sao Paulo, SP, Brazil
| | - Eliete Silva Guerra
- Laboratory of Oral Histopathology, Health Sciences Faculty of the University of Brasília, Brasilia, DF, Brazil
| | - Reem Hanna
- Department of Surgical Sciences and Integrated Diagnostics, Laser Therapy Centre of the University of Genoa, Genoa, Italy.,Department of Oral Surgery, King's College Hospital NHS Foundation Trust, London, UK
| | - Camila Barros Gallo
- Department of Stomatology, School of Dentistry of the Universidade de Sao Paulo, Av. Prof. Lineu Prestes, 2227 - Butantã, Sao Paulo, SP, Brazil.
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Júnior LHF, Limirio PHJO, Soares PBF, Dechichi P, de Souza Castro Filice L, Quagliatto PS, Rocha FS. The effect of hyperbaric oxygen therapy on bone macroscopy, composition and biomechanical properties after ionizing radiation injury. Radiat Oncol 2020; 15:95. [PMID: 32375798 PMCID: PMC7201996 DOI: 10.1186/s13014-020-01542-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Accepted: 04/22/2020] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Radiotherapy used in tumor treatment compromises vascularization of bone tissue. Hyperbaric oxygenation (HBO) increases oxygen availability and improves vascularization, minimizing the deleterious effects of ionizing radiation (IR). Therefore, the aim of this study was to evaluate HBO therapy effect on bone macroscopy, composition and biomechanical properties after IR damage. METHODS Twenty male Wistar rats weighing 300 ± 20 g (10 weeks of age) were submitted to IR (30 Gy) to the left leg, where the right leg was not irradiated. After 30 days, ten animals were submitted to HBO therapy, which was performed daily for 1 week at 250 kPa for 90-min sessions. All animals were euthanized 37 days after irradiation and the tibia were separated into four groups (n = 10): from animals without HBO - right tibia Non-irradiated (noIRnoHBO) and left tibia Irradiated (IRnoHBO); and from animals with HBO - right tibiae Non-irradiated (noIRHBO) and left tibia Irradiated (IRHBO). The length (proximal-distal) and thickness (anteroposterior and mediolateral) of the tibiae were measured. Biomechanical analysis evaluated flexural strength and stiffness. Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR) was used to calculate the amide I ratio, crystallinity index, and matrix to mineral ratios. RESULTS In the macroscopic and ATR-FTIR analysis, the IRnoHBO showed lower values of length, thickness and amide I ratio, crystallinity index and matrix to mineral ratios compared to noIRnoHBO (p < 0.03). IRnoHBO showed no statistical difference compared to IRHBO for these analyses (p > 0.05). Biomechanics analysis showed that the IRnoHBO group had lower values of flexural strength and stiffness compared to noIRnoHBO and IRHBO groups (p < 0.04). In addition, the noIRHBO group showed higher value of flexural strength when compared to noIRnoHBO and IRHBO groups (p < 0.02). CONCLUSIONS The present study concluded that IR arrests bone development, decreases the collagen maturation and mineral deposition process, thus reducing the flexural strength and stiffness bone mechanical parameters. Moreover, HBO therapy minimizes deleterious effects of irradiation on flexural strength and the bone stiffness analysis.
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Affiliation(s)
- Luiz Henrique Ferreira Júnior
- Integrated Dental Clinic Program, Faculty of Dentistry, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais 38.400-902 Brazil
| | - Pedro Henrique Justino Oliveira Limirio
- Integrated Dental Clinic Program, Faculty of Dentistry, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais 38.400-902 Brazil
| | - Priscilla Barbosa Ferreira Soares
- Department of Periodontology and Oral Implantology, Faculty of Dentistry, Federal University of Uberlândia, Avenida Pará s/nº, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais 38.400-902 Brazil
| | - Paula Dechichi
- Department of Cell Biology, Histology and Embryology, Faculty of Dentistry, Federal University of Uberlândia, Avenida Pará s/nº, Campus Umuarama, Bloco 2B, Bairro Umuarama, Uberlândia, Minas Gerais 38.400-902 Brazil
| | - Letícia de Souza Castro Filice
- Department of Clinical Medicine, Histology and Embryology, Faculty of Medicine, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4U, Bairro Umuarama, Uberlândia, Minas Gerais 38.400-902 Brazil
| | - Paulo Sérgio Quagliatto
- Department of Dentistry and Dental Materials, Faculty of Dentistry, Federal University of Uberlândia, Avenida Pará s/nº, Campus Umuarama, Bloco 2B, Bairro Umuarama, Uberlândia, Minas Gerais 38.400-902 Brazil
| | - Flaviana Soares Rocha
- Department of Oral and Maxillofacial Surgery and Traumatology and Implantology, Faculty of Dentistry, Federal University of Uberlândia, Avenida Pará s/nº, Campus Umuarama, Bloco 2B, Bairro Umuarama, Uberlândia, Minas Gerais 38.400-902 Brazil
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Limirio PHJO, Soares PBF, Emi ETP, Lopes CDCA, Rocha FS, Batista JD, Rabelo GD, Dechichi P. Ionizing radiation and bone quality: time-dependent effects. Radiat Oncol 2019; 14:15. [PMID: 30670063 PMCID: PMC6343359 DOI: 10.1186/s13014-019-1219-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 01/14/2019] [Indexed: 12/31/2022] Open
Abstract
Background The aim of this study was to evaluate the ionizing radiation (IR) effects on rat bone 30 and 60 days after irradiation. Methods Wistar rats were submitted to IR (30 Gy) on the left leg and were euthanized after 30 and 60 days. The legs were divided into four groups according to the treatment and euthanization time: C30 and C60 (right leg–without IR), IR30 and IR60 (left leg-with IR). Results CT analysis showed more radiodensity in C60 compared with other groups, and IR60 showed more radiodensity than IR30. In histomorphometric analysis, C30 showed lower bone matrix values compared with IR30 and C60. Lacunarity analyses showed more homogeneous bone channel distribution in C30 than IR30. ATR-FTIR showed decrease in ratio of mature and immature crosslinks in IR30 compared with C30. Crystallinity Index was decrease in IR60 compared with C60. The Amide III + Collagen/HA ratio was increased in C60 compared with C30; however this ratio decreased in IR60 compared with IR30. Biomechanical analysis showed lower values in IR groups in both time. Conclusions IR damaged bone quality and decreased stiffness. Moreover, the results suggested that the deleterious effects of IR increased in the late time points.
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Affiliation(s)
- Pedro Henrique Justino Oliveira Limirio
- Integrated Dental Clinic Program, Faculty of Dentistry, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38.400-902, Brazil
| | - Priscilla Barbosa Ferreira Soares
- Integrated Dental Clinic Program, Faculty of Dentistry, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38.400-902, Brazil
| | - Eduardo Tadashi Pinto Emi
- Integrated Dental Clinic Program, Faculty of Dentistry, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38.400-902, Brazil
| | - Camila de Carvalho Almança Lopes
- Integrated Dental Clinic Program, Faculty of Dentistry, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38.400-902, Brazil
| | - Flaviana Soares Rocha
- Integrated Dental Clinic Program, Faculty of Dentistry, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38.400-902, Brazil
| | - Jonas Dantas Batista
- Integrated Dental Clinic Program, Faculty of Dentistry, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38.400-902, Brazil
| | - Gustavo Davi Rabelo
- Faculty of Dentistry, Federal University of Juiz de Fora, Faculdade de Odontologia - Campus Universitário - Bairro Martelos -, Juiz de Fora, Minas Gerais, 36036-300, Brazil
| | - Paula Dechichi
- Integrated Dental Clinic Program, Faculty of Dentistry, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38.400-902, Brazil.
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Rottensteiner-Brandl U, Distel L, Stumpf M, Fey T, Köhn K, Bertram U, Lingens LF, Greil P, Horch RE, Arkudas A. Influence of Different Irradiation Protocols on Vascularization and Bone Formation Parameters in Rat Femora. Tissue Eng Part C Methods 2017; 23:583-591. [PMID: 28741426 DOI: 10.1089/ten.tec.2017.0170] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Aim of the present study was the establishment of an efficient and reproducible model for irradiation of rat femora as a model for impaired osteogenesis and angiogenesis. Four different irradiation protocols were compared: single irradiation of the left femur with 20 Gy and explantation after 4 or 8 weeks (group A, B) and three irradiation fractions at 3-4 days intervals with 10 Gy and explantation after 4 or 8 weeks (group C, D). The contralateral, unirradiated femur served as control. Evaluation included histology, microcomputertomography (μCT), and real-time polymerase chain reaction. Histology showed a pronounced increase of vacuoles in bone marrow after irradiation, especially after 4 weeks (group A and C), demonstrating bone marrow edema and fatty degeneration. Irradiation provoked a decrease of total cell numbers in cortical bone and of hypoxia-inducible factor 1 alpha (HIF1α)-positive cells in bone marrow. The expression of several markers (osteocalcin [OCN], runt-related transcription factor 2 [RUNX2], transforming growth factor beta 1 [TGFβ1], tumor necrosis factor alpha [TNFα], vascular endothelial growth factor A [VEGFA], and HIF1α) was decreased in group A after irradiation. This might suggest a decreased metabolism after irradiation. A significant decrease in small-sized vessels was seen in μCT evaluation in group A and D. Single irradiation with 20 Gy had the most severe and reproducible impact on osteogenesis and angiogenesis after 4 weeks while being well tolerated by all animals, thus making it an excellent model for evaluation of bone healing and vascularization in irradiated tissue.
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Affiliation(s)
- Ulrike Rottensteiner-Brandl
- 1 Department of Plastic and Hand Surgery, University Hospital Erlangen, Friedrich Alexander University Erlangen-Nürnberg FAU , Erlangen, Germany .,2 Department of Biochemistry, Friedrich-Alexander-University Erlangen-Nürnberg FAU , Erlangen, Germany
| | - Luitpold Distel
- 3 Department of Radiation Oncology, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg FAU , Erlangen, Germany
| | - Martin Stumpf
- 4 Department of Materials Science (Glass and Ceramics), Friedrich-Alexander-University Erlangen-Nürnberg FAU , Erlangen, Germany
| | - Tobias Fey
- 4 Department of Materials Science (Glass and Ceramics), Friedrich-Alexander-University Erlangen-Nürnberg FAU , Erlangen, Germany
| | - Katrin Köhn
- 1 Department of Plastic and Hand Surgery, University Hospital Erlangen, Friedrich Alexander University Erlangen-Nürnberg FAU , Erlangen, Germany
| | - Ulf Bertram
- 1 Department of Plastic and Hand Surgery, University Hospital Erlangen, Friedrich Alexander University Erlangen-Nürnberg FAU , Erlangen, Germany
| | - Lara F Lingens
- 1 Department of Plastic and Hand Surgery, University Hospital Erlangen, Friedrich Alexander University Erlangen-Nürnberg FAU , Erlangen, Germany
| | - Peter Greil
- 4 Department of Materials Science (Glass and Ceramics), Friedrich-Alexander-University Erlangen-Nürnberg FAU , Erlangen, Germany
| | - Raymund E Horch
- 1 Department of Plastic and Hand Surgery, University Hospital Erlangen, Friedrich Alexander University Erlangen-Nürnberg FAU , Erlangen, Germany
| | - Andreas Arkudas
- 1 Department of Plastic and Hand Surgery, University Hospital Erlangen, Friedrich Alexander University Erlangen-Nürnberg FAU , Erlangen, Germany
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Acauan MD, Figueiredo MAZ, Cherubini K, Gomes APN, Salum FG. Radiotherapy-induced salivary dysfunction: Structural changes, pathogenetic mechanisms and therapies. Arch Oral Biol 2015; 60:1802-10. [DOI: 10.1016/j.archoralbio.2015.09.014] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Revised: 09/18/2015] [Accepted: 09/20/2015] [Indexed: 01/01/2023]
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Açil Y, Gierloff M, Behrens C, Möller B, Gassling V, Niehoff P, Wiltfang J, Simon M. Effects of zoledronate on irradiated bone in vivo: analysis of the collagen types I, V and their cross-links lysylpyridinoline, hydroxylysylpyridinoline and hydroxyproline. Calcif Tissue Int 2013. [PMID: 23179106 DOI: 10.1007/s00223-012-9676-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Radiotherapy can lead to a reduction of bone density with an increased risk of pathological fractures. Bisphosphonates may represent a preventive treatment option by increasing the density of anorganic bone mineral. Yet it is unknown how bisphosphonates act on irradiated collagen cross-links, which play an essential role for the mechanical stability of bone. The aim of this study was to evaluate the effects of zoledronate on bone collagens and their cross-links after irradiation. The right femur of 37 rats was irradiated with a single dose of 9.5 Gy at a high dose rate using an afterloading machine. Half of the rats (n=18) received additionally a single dose zoledronate (0.1 mg/kg body weight). Fourteen and 100 days after irradiation the femora were collected for histologic evaluation and determination of the collagen cross-links lysylpyridinoline, hydroxylysylpyridinoline, and hydroxyproline. The collagen types were characterized by sodium dodecyl sulfate polyacrylamide gel electrophoresis. Fourteen days after treatment the lysylpyridinoline levels of all treatment groups were significantly lower compared to the untreated control. After 100 days, in the combined radiotherapy+zoledronate group significantly lower lysylpyridinoline values were determined (p=0.009). Radiotherapy and/or zoledronate did not change significantly the level of hydroxylysylpyridinoline. The concentration of hydroxyproline was 14 days after irradiation significantly higher in the combined treatment group compared to the control. No significant differences were observed 100 days after treatment. Zoledronate does not have the ability to restore the physiological bone collagen cross-link levels after radiotherapy. However, this would be necessary for regaining the physiological mechanical stability of bone after irradiation and therefore to prevent effectively radiation-induced fractures.
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Affiliation(s)
- Yahya Açil
- Department of Oral and Maxillofacial Surgery, UK-SH, Campus Kiel, Germany
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Vieillard MH, Paccou J, Cortet B, Biver E, Salleron J, Falgayrac G, Penel G. Effects of high dose of zoledronic acid on superficial vascular network of membranous bone sites: an intravital study on rat calvarium. Osteoporos Int 2010; 21:1919-25. [PMID: 20020279 DOI: 10.1007/s00198-009-1146-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2009] [Accepted: 11/09/2009] [Indexed: 10/20/2022]
Abstract
UNLABELLED We evaluated the impact of high dose of zoledronic acid on the superficial vascular network parameters of a membranous bone site. During a 5-day follow-up, significant reduction of the vascular density is observed only in the treated group. INTRODUCTION The superficial vascularization is of great importance in membranous bone-healing process. A new rat calvarium intravital model was developed to study the short-term effect of a single high dose of zoledronic acid infusion on the superficial vascularization. METHODS Optical bone chambers were implanted in the bone tissue surface of Sprague-Dawley rats' calvarium. Nine rats were injected i.v. with 400 µg/kg of zoledronic acid (Z group), and nine rats were injected with vehicle (PSS group). A 5-day follow-up of the vascular network was made by the use of pictures analysis method. RESULTS The vascular density significantly decreases only in Z group but there was no significant difference between groups at individual time points. The total length of the vascular network decreases significantly in Z group only (p=0.003) with a significant higher decrease at D3 (p=0.04) and D5 (p=0.02) compared with control. The vascular density related to the smaller vessels (width, 5-10 µm) decreases significantly between T0 and D5 in Z group only (p=0.002). CONCLUSIONS With the help of an original intravital animal model a significant modifications on the total length of the vascular network and the vascular density of small vessels are highlighted on a membranous bone site.
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Affiliation(s)
- M H Vieillard
- Department of Rheumatology, Hôpital Roger Salengro, University Lille Nord de France, CHRU Lille, 59037, Lille cedex, France.
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Desmons SO, Salleron J, Delfosse CJ, Falgayrac G, Penel G, Mordon SR. Laser preconditioning on cranial bone site: analysis of morphological vascular parameters. Lasers Surg Med 2010; 42:631-7. [PMID: 20976803 DOI: 10.1002/lsm.20971] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND AND OBJECTIVES Bone vascularization is a key factor in the bone healing process following X-ray irradiation. Preserving the vascular network from X-ray-induced injury is a relevant approach in the promotion of bone healing. Previously, we developed a protocol of laser preconditioning (810 nm diode laser, 36 J/cm²) prior to X-ray radiation (18.75 Gy) which protects the bone vascular network from deleterious effects of X-ray radiation. The aim of this present work is to characterize the effects of laser preconditioning on the bone through a morphological analysis of vascular parameters. MATERIALS AND METHODS Digital images of the vascular plexus were taken through an optical bone chamber which was implanted onto the calvaria of rabbits. Bespoke software was used for the quantification of the vessels (classified in four groups according to their diameter), vessel length, and number of nodes at weeks 0, 4, and 8. Twenty rabbits were divided into four groups: control group #1 (n = 5); laser group #2 (n = 5). X-ray radiation group #3 (n = 5), laser preconditioning 24 hours prior to X-ray radiation group #4 (n = 5). RESULTS The bone vascular network was stable for groups #1 and #2. Statistical analysis showed a significant reduction of each observed vascular parameter for groups #3 and #4. In the laser preconditioned group #4 the loss was less marked than in the X-ray group #3, especially for large vessels (diameter >50 µm). DISCUSSION AND CONCLUSION We provide in vivo microcirculatory evidence to support the concept of laser preconditioning of bone. A computer-based semi-automatic system is described to quantify superficial bone vascular network parameters that had been treated by laser preconditioning prior to X-ray radiation. Laser preconditioning significantly attenuates the deletion of the superficial bone vascular network irradiated by X-ray, especially concerning large diameter vessels.
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Hyperbaric Oxygen Therapy in the Management of Radiation-Induced Injury in the Head and Neck Region: A Review of the Literature. J Oral Maxillofac Surg 2010; 68:1732-9. [DOI: 10.1016/j.joms.2010.02.040] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2009] [Revised: 11/09/2009] [Accepted: 02/18/2010] [Indexed: 11/21/2022]
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Biver E, Vieillard MH, Cortet B, Salleron J, Falgayrac G, Penel G. No anti-angiogenic effect of clinical dosing regimens of a single zoledronic acid injection in an experimental bone healing site. Bone 2010; 46:643-8. [PMID: 19895916 DOI: 10.1016/j.bone.2009.10.034] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2009] [Revised: 10/15/2009] [Accepted: 10/28/2009] [Indexed: 02/06/2023]
Abstract
INTRODUCTION An anti-angiogenic effect of bisphosphonates has been reported in different experimental models. Zoledronic acid is currently administered in osteoporotic patients as a single 5 mg injection once a year and its vascular effect in bone has not been yet evaluated. MATERIALS AND METHODS The vascular dose effect of a single injection of zoledronic acid was evaluated on healing vascularization developed under a bone chamber implanted on the calvaria of 30 rats. After 3 weeks of healing, the rats were randomized into 3 groups receiving an injection of either physiologic saline solution (PSS) or zoledronic acid tested at 120 microg/kg, the equivalent of a 5 mg dose of zoledronic acid in humans (Z120), and 400 microg/kg, a supra-pharmacologic dose (Z400). A longitudinal follow-up of the healing vascular network was carried out at days (D) 1, 3, 6, 9, 12, 15 and 28 after injection by intravital imaging. Variations in vascular density, total length of the vascular network and mean diameter of vascular network branches were determined by image analysis (Aphelion software). RESULTS A decrease was observed in both vascular density and total length of the network in control and treated groups (time effect). No difference in variation in vascular density was observed between the PSS group and the Z120 group at any time point (p=NS). A trend to a higher decrease in vascular density was noted between D12 and D15 in the Z400 group. A significant decrease in total length was noted at D15 in the Z400 group (p=0.03) compared to the PSS group, whereas no change was noted in rats treated with 120 microg/kg compared to PSS rats on any of the follow-up days (p=0.2). No variation in mean diameter of vascular network branches was noted in any of the three groups at any of the follow-up days (p=0.53). CONCLUSION A single injection of clinically relevant dosing regimens of zoledronic acid may not have a notable impact on vascularization in bone sites. The anti-angiogenic effect of bisphosphonates seems to express itself, in our model, at higher doses than those used in patients treated for osteoporosis.
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Affiliation(s)
- E Biver
- Department of Rheumatology, CHRU Lille, University Lille Nord de France, 59037 Lille, France.
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Weinstein RS. Glucocorticoids, osteocytes, and skeletal fragility: the role of bone vascularity. Bone 2010; 46:564-70. [PMID: 19591965 PMCID: PMC2823999 DOI: 10.1016/j.bone.2009.06.030] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Revised: 06/30/2009] [Accepted: 06/30/2009] [Indexed: 01/23/2023]
Abstract
Glucocorticoid administration is required for many inflammatory and autoimmune diseases, but use of these drugs is associated with skeletal side effects including bone loss, fractures, and osteonecrosis. Fractures often occur without a reduction in bone mineral density, strongly suggesting that glucocorticoid excess adversely affects other aspects of bone strength. Although the primary effects of glucocorticoid excess on the skeleton are directly on bone cells, a vascular connection between these cells and the loss of bone strength appears likely. This review examines this connection and how it may explain the greater decline in bone strength than loss of bone mass that occurs with glucocorticoid excess.
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Affiliation(s)
- Robert S Weinstein
- Department of Internal Medicine and the Central Arkansas Veterans Healthcare System,University of Arkansas for Medical Sciences, Little Rock, AR 72205-7199, USA.
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