Objective: To observe the clinical effect of 20% deproteinized calfblood extract eye gel on the treatment of mechanical injury to corneal epithelium. Methods: 120 cases of patients with corneal epithelial defect cause...Objective: To observe the clinical effect of 20% deproteinized calfblood extract eye gel on the treatment of mechanical injury to corneal epithelium. Methods: 120 cases of patients with corneal epithelial defect caused by mechanical injury were selected and randomly divided into observation group (60 eyes, deproteinized calfblood extract eye gel in use) and control group (0.3% ofloxacin eye drops in use). Both two groups of patients were given eye gel or eye drops 4 times per day. Moreover, the two groups of eye symptoms and corneal epithelial healing were observed on the 3rd day and the 7th day after drug usage respectively. Results: The effective rates of 20% deproteinized calfblood extract eye gel on the treatment of mechanical corneal epithelial defect on the 3rd day and the 7th day were 78.33% and 93.33% respectively. Meanwhile, the effective rates of 0.3% ofloxacin eye drops were 55.00% and 71.67%. The difference in the comparison of the effective rate between two groups was of statistical significance (p < .05). Conclusions: 20% deproteinized calfblood extract eye gel can significantly promote the healing of corneal epithelium in a short time, and it is worthy to be widely applied clinically.展开更多
The present study describes the characterization of crude protease extract from Arthrobacter arilaitensis Re117 and its evaluation in solid and liquid detergent. One caseinolytic protease clear band was observed in zy...The present study describes the characterization of crude protease extract from Arthrobacter arilaitensis Re117 and its evaluation in solid and liquid detergent. One caseinolytic protease clear band was observed in zymogram. The crude alkaline protease showed optimum activity at pH 9.0 and 50°C, and it was highly stable over a wide range of pH from 8.0 to 9.0. Proteolytic enzymes showed extreme stability towards non-ionic surfactants (Tween 80, Tween 20 and Triton X-100) and stimulate activity towards oxidizing agents such as sodium perborate. They also showed high stability and compatibility with various laundry solid detergents from Tunisian market. The protease of A. arilaitensis Re117, was also tested for shrimp waste deproteinization to produce chitin. The protein removal with a ratio E/S of 20 was about 83%. The novelties of the Re117 protease include its high stability to organic solvents and surfactants. These unique properties make it an ideal choice for application in detergent formulations and enzymatic peptide synthesis. In addition, the enzyme may find potential applications in the deproteinization of shrimp wastes to produce chitin.展开更多
Objective： To explore suitable scaffold material for big segmental long bone defect by studying the properties of the prepared deproteinized bone. Methods： Cancellated bone were made as 30 mm × 3 mm × 3 m...Objective： To explore suitable scaffold material for big segmental long bone defect by studying the properties of the prepared deproteinized bone. Methods： Cancellated bone were made as 30 mm × 3 mm × 3 mm bone blocks from inferior extremity of pig femur along bone trabecula. The deproteinized bone was prepared with an improved method. Their morphological features, components, cell compatibility, mechanical and immunological properties were investigated respectively. Results： Deproteinized bone maintained natural re-ticular pore system. The main organic material is collagen I and inorganic composition is hydroxyapatite. It has good mechanical properties, cell adhesion rate and histocompatibility. Conlusion： This deproteinized bone can be applicable as scaffold for reparation of big segmental defect in long bone.展开更多
Objective： To study biomechanical changes of newly formed bones 24 weeks after repairing large defects of long bones of goats using heterogeneous deproteinated bone （DPB） prepared by modified methods as an engineer...Objective： To study biomechanical changes of newly formed bones 24 weeks after repairing large defects of long bones of goats using heterogeneous deproteinated bone （DPB） prepared by modified methods as an engineering scaffold. Methods： According to a fully randomized design, 18 goats were evenly divided into three groups： normal bone control group （Group A）, autologous bone group （Group B） and experimental group （Group C）. Each goat in Groups B and C were subjected to the periosteum and bone defect at middle-lower part of the right tibia （20% of the whole tibia in length）, followed by autologous bone or DPB plus autolognus MSCs ＋ rhBMP2 implantation, respectively and semi- ring slot fixation; while goats in Group A did not perform osteotomy. At 24 weeks after surgery, biomechanical tests were carried out on the tibias. Results： At 24 weeks after surgery, the results of anticompression test on tibias in three groups were recorded by a functional recorder presented as linear pressure-deformation curve. The shapes of the curves and their change tendency were similar among three groups. The ultimate pressure values were 10.74 MPa±1.23 MPa, 10. 11 MPa±1.35 MPa and 10.22 MPa±1.32 MPa and fracture compression rates were 26.82%±0.87%, 27.17%±0.75% and 28.22%±1.12% in Groups A, B and C, respectively. Comparisons of anti-compression ultimate pressures and fracture compression rates among three groups demonstrated no significant difference （PAB=0.415, PBC=0.494）. Three-point antibend test on tibias was recorded as load-deformation curves, and the shapes of the curves and their change tendency were similar among three groups. The ultimate pressure values of the anti-bend test were 481.52 N±12.45 N, 478.34 N±14.68 N and 475.62 N±13.41 N and the fracture bend rates were 2.62 mm±0.12 mm, 2.61 mm±0.15 mm and 2.81 mm±0.13 mm in Groups A, B and C, respectively. There was no significant difference between groups （PAB=0.7, PBc=0.448）. The ultimate anti-torsion torque values were 6.55 N.mi-0.25 N.m, 6.34 N＇m^0.18 N＇m and 6.42 N＇m^0.21 N＇m and fracture torsion rates were 29.51°±1.64°, 28.88±1.46° and 28.81°±1.33° in Groups A, B and C, respectively. There was no significant difference between groups （PAB=0.123, PBc=0.346）. Conclusions： The biomechanical characteristics of newly formed bones from heterogeneous DPB for repairing large segmental long bone defect are comparable to those of normal bones and autologous bones. DPB has the potential for clinical usage as bone graft material.展开更多
Objective： To observe the immune response after the transplantation of a deproteinized heterogeneous bone scaffold and provides the theoretic reference for clinical practice. Methods： The fresh pig bone and deprote...Objective： To observe the immune response after the transplantation of a deproteinized heterogeneous bone scaffold and provides the theoretic reference for clinical practice. Methods： The fresh pig bone and deproteinized bone were transplanted respectively to establish BABL/C thigh muscle pouches model of male mice and take the samples for detection at 1, 2, 4, 6 weeks after operation. Lymphocyte stimulation index, subset analysis, serum specific antibody IgG, cytokine detection and topographic histologic reaction after implantation were investigated. Results： After the transplantation of deproteinized bone, lymphocyte stimulation index, CD4^＋ and CD8^＋ T-lymphocyte subsets, serum specific antibody IgG and cytokines in deproteinized bone group were significantly lower than those in fresh pig bone group at each time point （P〈0.05）. The histological examination found that in fresh bone group at each time point, a large quantity of inflammatory cells infiltrated in the surrounding of bone graft, and they were mainly lymphocytes, including macrophages and monocytes. In deproteinized bone group, there were few inflammatory cells infiltration around bone graft one week after operation. The lymphocytes were decreased as time went by. At 6 weeks, fibroblasts and fibrous tissue grew into the graft, and osteoclasts and osteoprogenitor cells appeared on the verge. Conclusions： The established heterogeneous deproteinized bone has low immunogenicity and is a potentially ideal scaffold material for bone tissue engineering.展开更多
Tooth presents an intriguing option as a bone graft due to its compositional similarity to bone.However,the deproteinized human demineralized tooth matrix(dpDTM),developed to overcome the limited availability of autol...Tooth presents an intriguing option as a bone graft due to its compositional similarity to bone.However,the deproteinized human demineralized tooth matrix(dpDTM),developed to overcome the limited availability of autologous tooth grafts,has suboptimal pore size and surface roughness.This study aimed to fabricate a surface-modified dpDTM using acid etching and collagen coating,followed by in vitro evaluation of physicochemical and biological properties.The dpDTM was modified into two protocols:Acid-modified dpDTM(A-dpDTM)and collagen-modified dpDTM(C-dpDTM).Results demonstrated that A-dpDTM and C-dpDTM had increased pore sizes and rougher surfaces compared to dpDTM.Collagen immobilization was evidenced by nitrogen presence exclusively in C-dpDTM.All groups had a Ca/P molar ratio of 1.67 and hydroxyapatite as the sole constituent,with 65-67%crystallinity.Degradation rates significantly increased to 30%and 20%for C-dpDTM and A-dpDTM,respectively,compared to 10%for dpDTM after 120 days.Cumulative collagen release of C-dpDTM on Day 30 was 45.16 mg/ml.Osteoblasts attachment and proliferation were enhanced on all scaffolds,especially C-dpDTM,which displayed the highest proliferation and differentiation rates.In conclusion,surface modified of dpDTM,including A-dpDTM and C-dpDTM,significantly enhances bioactivity by altering surface properties and promoting osteoblast activity,thereby demonstrating promise for bone regeneration applications.展开更多
文摘Objective: To observe the clinical effect of 20% deproteinized calfblood extract eye gel on the treatment of mechanical injury to corneal epithelium. Methods: 120 cases of patients with corneal epithelial defect caused by mechanical injury were selected and randomly divided into observation group (60 eyes, deproteinized calfblood extract eye gel in use) and control group (0.3% ofloxacin eye drops in use). Both two groups of patients were given eye gel or eye drops 4 times per day. Moreover, the two groups of eye symptoms and corneal epithelial healing were observed on the 3rd day and the 7th day after drug usage respectively. Results: The effective rates of 20% deproteinized calfblood extract eye gel on the treatment of mechanical corneal epithelial defect on the 3rd day and the 7th day were 78.33% and 93.33% respectively. Meanwhile, the effective rates of 0.3% ofloxacin eye drops were 55.00% and 71.67%. The difference in the comparison of the effective rate between two groups was of statistical significance (p < .05). Conclusions: 20% deproteinized calfblood extract eye gel can significantly promote the healing of corneal epithelium in a short time, and it is worthy to be widely applied clinically.
文摘The present study describes the characterization of crude protease extract from Arthrobacter arilaitensis Re117 and its evaluation in solid and liquid detergent. One caseinolytic protease clear band was observed in zymogram. The crude alkaline protease showed optimum activity at pH 9.0 and 50°C, and it was highly stable over a wide range of pH from 8.0 to 9.0. Proteolytic enzymes showed extreme stability towards non-ionic surfactants (Tween 80, Tween 20 and Triton X-100) and stimulate activity towards oxidizing agents such as sodium perborate. They also showed high stability and compatibility with various laundry solid detergents from Tunisian market. The protease of A. arilaitensis Re117, was also tested for shrimp waste deproteinization to produce chitin. The protein removal with a ratio E/S of 20 was about 83%. The novelties of the Re117 protease include its high stability to organic solvents and surfactants. These unique properties make it an ideal choice for application in detergent formulations and enzymatic peptide synthesis. In addition, the enzyme may find potential applications in the deproteinization of shrimp wastes to produce chitin.
文摘Objective： To explore suitable scaffold material for big segmental long bone defect by studying the properties of the prepared deproteinized bone. Methods： Cancellated bone were made as 30 mm × 3 mm × 3 mm bone blocks from inferior extremity of pig femur along bone trabecula. The deproteinized bone was prepared with an improved method. Their morphological features, components, cell compatibility, mechanical and immunological properties were investigated respectively. Results： Deproteinized bone maintained natural re-ticular pore system. The main organic material is collagen I and inorganic composition is hydroxyapatite. It has good mechanical properties, cell adhesion rate and histocompatibility. Conlusion： This deproteinized bone can be applicable as scaffold for reparation of big segmental defect in long bone.
文摘Objective： To study biomechanical changes of newly formed bones 24 weeks after repairing large defects of long bones of goats using heterogeneous deproteinated bone （DPB） prepared by modified methods as an engineering scaffold. Methods： According to a fully randomized design, 18 goats were evenly divided into three groups： normal bone control group （Group A）, autologous bone group （Group B） and experimental group （Group C）. Each goat in Groups B and C were subjected to the periosteum and bone defect at middle-lower part of the right tibia （20% of the whole tibia in length）, followed by autologous bone or DPB plus autolognus MSCs ＋ rhBMP2 implantation, respectively and semi- ring slot fixation; while goats in Group A did not perform osteotomy. At 24 weeks after surgery, biomechanical tests were carried out on the tibias. Results： At 24 weeks after surgery, the results of anticompression test on tibias in three groups were recorded by a functional recorder presented as linear pressure-deformation curve. The shapes of the curves and their change tendency were similar among three groups. The ultimate pressure values were 10.74 MPa±1.23 MPa, 10. 11 MPa±1.35 MPa and 10.22 MPa±1.32 MPa and fracture compression rates were 26.82%±0.87%, 27.17%±0.75% and 28.22%±1.12% in Groups A, B and C, respectively. Comparisons of anti-compression ultimate pressures and fracture compression rates among three groups demonstrated no significant difference （PAB=0.415, PBC=0.494）. Three-point antibend test on tibias was recorded as load-deformation curves, and the shapes of the curves and their change tendency were similar among three groups. The ultimate pressure values of the anti-bend test were 481.52 N±12.45 N, 478.34 N±14.68 N and 475.62 N±13.41 N and the fracture bend rates were 2.62 mm±0.12 mm, 2.61 mm±0.15 mm and 2.81 mm±0.13 mm in Groups A, B and C, respectively. There was no significant difference between groups （PAB=0.7, PBc=0.448）. The ultimate anti-torsion torque values were 6.55 N.mi-0.25 N.m, 6.34 N＇m^0.18 N＇m and 6.42 N＇m^0.21 N＇m and fracture torsion rates were 29.51°±1.64°, 28.88±1.46° and 28.81°±1.33° in Groups A, B and C, respectively. There was no significant difference between groups （PAB=0.123, PBc=0.346）. Conclusions： The biomechanical characteristics of newly formed bones from heterogeneous DPB for repairing large segmental long bone defect are comparable to those of normal bones and autologous bones. DPB has the potential for clinical usage as bone graft material.
文摘Objective： To observe the immune response after the transplantation of a deproteinized heterogeneous bone scaffold and provides the theoretic reference for clinical practice. Methods： The fresh pig bone and deproteinized bone were transplanted respectively to establish BABL/C thigh muscle pouches model of male mice and take the samples for detection at 1, 2, 4, 6 weeks after operation. Lymphocyte stimulation index, subset analysis, serum specific antibody IgG, cytokine detection and topographic histologic reaction after implantation were investigated. Results： After the transplantation of deproteinized bone, lymphocyte stimulation index, CD4^＋ and CD8^＋ T-lymphocyte subsets, serum specific antibody IgG and cytokines in deproteinized bone group were significantly lower than those in fresh pig bone group at each time point （P〈0.05）. The histological examination found that in fresh bone group at each time point, a large quantity of inflammatory cells infiltrated in the surrounding of bone graft, and they were mainly lymphocytes, including macrophages and monocytes. In deproteinized bone group, there were few inflammatory cells infiltration around bone graft one week after operation. The lymphocytes were decreased as time went by. At 6 weeks, fibroblasts and fibrous tissue grew into the graft, and osteoclasts and osteoprogenitor cells appeared on the verge. Conclusions： The established heterogeneous deproteinized bone has low immunogenicity and is a potentially ideal scaffold material for bone tissue engineering.
基金supported by National Science,Research and Innovation Fund(NSRF)and Prince of Songkla University(Ref.No.DEN6701281S)Cranio-Maxillofacial Hard Tissue Engineering Center,Faculty of Dentistry,Prince of Songkla University.
文摘Tooth presents an intriguing option as a bone graft due to its compositional similarity to bone.However,the deproteinized human demineralized tooth matrix(dpDTM),developed to overcome the limited availability of autologous tooth grafts,has suboptimal pore size and surface roughness.This study aimed to fabricate a surface-modified dpDTM using acid etching and collagen coating,followed by in vitro evaluation of physicochemical and biological properties.The dpDTM was modified into two protocols:Acid-modified dpDTM(A-dpDTM)and collagen-modified dpDTM(C-dpDTM).Results demonstrated that A-dpDTM and C-dpDTM had increased pore sizes and rougher surfaces compared to dpDTM.Collagen immobilization was evidenced by nitrogen presence exclusively in C-dpDTM.All groups had a Ca/P molar ratio of 1.67 and hydroxyapatite as the sole constituent,with 65-67%crystallinity.Degradation rates significantly increased to 30%and 20%for C-dpDTM and A-dpDTM,respectively,compared to 10%for dpDTM after 120 days.Cumulative collagen release of C-dpDTM on Day 30 was 45.16 mg/ml.Osteoblasts attachment and proliferation were enhanced on all scaffolds,especially C-dpDTM,which displayed the highest proliferation and differentiation rates.In conclusion,surface modified of dpDTM,including A-dpDTM and C-dpDTM,significantly enhances bioactivity by altering surface properties and promoting osteoblast activity,thereby demonstrating promise for bone regeneration applications.
