共查询到20条相似文献,搜索用时 31 毫秒
1.
We demonstrated previously that local, intra-articular injection of an adenoviral vector expressing human tumor necrosis factor-related
apoptosis-inducing ligand (TRAIL) in a rabbit knee model of inflammatory arthritis stimulated synovial apoptosis and reduced
inflammation. To examine whether intra-articular injection of recombinant chimeric human TRAIL protein (rTRAIL) also induces
apoptosis of proliferating rabbit synovium and reduces inflammation, we used an experimental rabbit arthritis model of rheumatoid
arthritis, induced by intra-articular introduction of allogeneic fibroblasts genetically engineered to secrete human IL-1β.
Analysis of synovium isolated from the rabbits treated with intra-articular injection of rTRAIL, relative to saline control,
showed areas of extensive acellular debris and large fibrous regions devoid of intact cells, similar to adenoviral mediated
TRAIL gene transfer. Extensive apoptosis of the synovial lining was demonstrated using TUNEL analysis of the sections, corresponding
to the microscopic findings in hematoxylin and eosin staining. In addition, leukocyte infiltration into the synovial fluid
of the inflamed knee joints following rTRAIL treatment was reduced more than 50% compared with the saline control. Analysis
of the glycosaminoglycan synthetic rate by cultured cartilage using radiolabeled sulfur and cartilage histology demonstrated
that rTRAIL did not adversely affect cartilage metabolism and structure. Analysis of serum alanine aminotransferase showed
that intra-articular injection of rTRAIL did not have adverse effects on hepatic function. These results demonstrate that
intra-articular injection of rTRAIL could be therapeutic for treating pathologies associated with rheumatoid arthritis. 相似文献
2.
Liming Bian Michael Kaplun David Y. Williams Duo Xu Gerard A. Ateshian Clark T. Hung 《Journal of biomechanics》2009,42(3):286-290
A recent study [Basalo et al., 2007. Chondroitin sulfate reduces the friction coefficient of articular cartilage. J. Biomech. 40(8), 1847–1854] has shown that the friction coefficient of bovine articular cartilage is reduced significantly by the supplementation of chondroitin sulfate (CS) at a concentration of 100 mg/ml. This result suggests that intra-articular injection of CS may be used as a prophylactic treatment against the progression of osteoarthritis. The objective of this study was to test the hypothesis that long-term culture of cartilage explants in CS produces no adverse mechanical, biochemical, or cytotoxic effects, while reducing the friction coefficient relative to the control group. Long-term cultures of live bovine articular cartilage explants were performed with incubation in media containing CS of three different concentrations (0, 10 and 100 mg/ml). Frictional tests (cartilage-on-glass) were performed under constant stress (0.5 MPa) for 3600 s and the time-dependent friction coefficient was measured. Samples incubated in a 100 mg/ml of CS solution exhibited a significantly lower equilibrium friction coefficient than the control (0.05±0.01 vs. 0.18±0.02 on Day 0, 0.04±0.01 vs. 0.14±0.04 on Day 7 and 0.04±0.01 vs. 0.15±0.06 on Day 14). Samples incubated in 10 mg/ml of CS did not exhibit any significant decrease in the friction coefficient. Cell viability and DNA content were maintained in all groups. However, after 28 days of culture, the Young's modulus and glycosaminoglycan content of explants incubated in 100 mg/ml of CS decreased to 5% and 40% of their initial levels, respectively. Based on this adverse outcome the hypothesis of this study is rejected, dampening our enthusiasm for the use of intra-articular CS injections as a prophylactic treatment in osteoarthritis. 相似文献
3.
Bone morphogenetic protein-7 (BMP-7) regulates cartilage metabolism and promotes matrix synthesis. However, the effect of
BMP-7 on inflammatory arthritis remains unknown. We investigated the effect and mechanism of exogenous BMP-7 on cartilage
and synovium in vivo in rat zymosan-induced arthritis. Zymosan was injected into the left knees of Wistar rats. Phosphate-buffered
saline or BMP-7 at 10, 100, or 1000 ng per joint was injected into the left knee every 2 days. Normal joints acted as normal
controls. The knee joints were analyzed histologically and immunohistologically at 14 days. Joint swelling was evaluated by
measuring the transverse diameter of the knee joints. Synovial lysates were collected, and the concentrations of interleukin-1β
(IL-1β), IL-6, and IL-10 were measured by enzyme-linked immunosorbent assay. Intra-articular injection of zymosan resulted
in acute inflammation and was followed by cartilage degeneration. Local administrations of BMP-7 inhibited this loss of cartilage
matrix in a dose-dependent manner. Immunohistochemical analysis demonstrated enhanced type II collagen levels in cartilage
and enhanced BMP-7 levels in cartilage and synovium after exogenous BMP-7 treatment. Joint swelling and cell infiltration
into synovium were significantly reduced by BMP-7 injections. Administration of BMP-7 decreased IL-1β production significantly
and increased IL-10 production in the synovium. Thus, intra-articular injections of BMP-7 had a protective effect on cartilage
degeneration in the inflammatory arthritis model by enhancing levels of BMP-7 in cartilage and suppressing the production
of IL-1β in synovium. 相似文献
4.
Tommaso Iannitti Mohamed Elhensheri Ali Ö. Bingöl Beniamino Palmieri 《Journal of molecular histology》2013,44(2):191-201
Osteoarthritis is a degenerative joint disease mostly occurring in the knee and commonly seen in middle-aged and elderly adults. Intra-articular injection of hyaluronic acid has been widely used for treatment of knee osteoarthritis. The aim of this study was to evaluate the efficacy of intra-articular injection of a novel highly cross-linked hyaluronic acid, alone or in combination with ropivacaine hydrochloride and triamcinolone acetonide, on knee articular cartilage in a rabbit model of collagenase-induced knee osteoarthritis. After induction of experimental osteoarthritis by intra-articular injection of collagenase, adult New Zealand white rabbits (n = 12) were divided into 3 groups. Group 1 (control group) received 0.3 ml phosphate buffered saline into the right knee joint. Group 2 received 0.3 ml cross-linked hyaluronic acid (33 mg/ml) into the right knee joint. Group 3 received a mixture of 0.15 ml cross-linked hyaluronic acid (33 mg/ml), 0.05 ml ropivacaine hydrochloride 1 % and 0.1 ml triamcinolone acetonide (10 mg/ml) into the right knee joint. Intra-articular injections were given 4 weeks after first collagenase injection and were administered once a week for 3 weeks. Gross pathology and histological evaluation of rabbits’ knee joints were performed after 16 weeks following initial collagenase injection. Histological analysis of sections of right knee joints at lesion sites showed a significant decrease in Mankin’s score in groups treated with hyaluronic acid alone or in combination with ropivacaine hydrochloride and triamcinolone acetonide versus control group (p < 0.05 and p < 0.01 respectively). This evidence was consistent with strong articular degenerative changes in control right knee joints (grade III osteoarthritis), while the treated groups revealed less severe articular degenerative changes (grade II osteoarthritis). The present results show that cross-linked hyaluronic acid, alone or in combination with ropivacaine hydrochloride and triamcinolone acetonide, produces a significant improvement in knee articular cartilage degeneration in a rabbit model of collagenase-induced osteoarthritis. 相似文献
5.
We demonstrated previously that local, intra-articular injection of an adenoviral vector expressing human tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) in a rabbit knee model of inflammatory arthritis stimulated synovial apoptosis and reduced inflammation. To examine whether intra-articular injection of recombinant chimeric human TRAIL protein (rTRAIL) also induces apoptosis of proliferating rabbit synovium and reduces inflammation, we used an experimental rabbit arthritis model of rheumatoid arthritis, induced by intra-articular introduction of allogeneic fibroblasts genetically engineered to secrete human IL-1beta. Analysis of synovium isolated from the rabbits treated with intra-articular injection of rTRAIL, relative to saline control, showed areas of extensive acellular debris and large fibrous regions devoid of intact cells, similar to adenoviral mediated TRAIL gene transfer. Extensive apoptosis of the synovial lining was demonstrated using TUNEL analysis of the sections, corresponding to the microscopic findings in hematoxylin and eosin staining. In addition, leukocyte infiltration into the synovial fluid of the inflamed knee joints following rTRAIL treatment was reduced more than 50% compared with the saline control. Analysis of the glycosaminoglycan synthetic rate by cultured cartilage using radiolabeled sulfur and cartilage histology demonstrated that rTRAIL did not adversely affect cartilage metabolism and structure. Analysis of serum alanine aminotransferase showed that intra-articular injection of rTRAIL did not have adverse effects on hepatic function. These results demonstrate that intra-articular injection of rTRAIL could be therapeutic for treating pathologies associated with rheumatoid arthritis. 相似文献
6.
Aleksandra Wysocka Karolina Mann Henryk Bursig Juliusz Dec Tadeusz S. Gaździk 《Cell and tissue banking》2010,11(2):209-215
Autologous chondrocyte implantation has been shown to be a promising method for treatment of deep articular cartilage defects.
The hyaline cartilage formed by implanted autologous chondrocytes has biomechanical properties similar to those of natural
articular cartilage. Between June 2006 and September 2008 we performed Autologous chondrocyte implantation (ACI) in 50 patients
and the chondrocytes were supported in fibrin glue. The cartilage biopsy samples were taken from the non-weight bearing area
of the patient’s femoral condyle and the samples were transferred to the cell culture laboratory. Chondrocyte were kept in
culture about 20 days. Fibrin glue was used as a three dimensional carrier for chondrocyte implantation. A 450 ml of patient’s
own blood was collected prior to transplantation to produce autologous fibrinogen. Alternatively the allogenic fibrinogen
was prepared from Regional Blood Center voluntary donors. Before surgery the chondrocyte suspension was mixed with fibrin
glue and gel—like fibrograft was prepared. The total number of cells and the size of fibrograft depended on the defect size
in the knee. Our results suggest that ACI technique with fibrin glue is a promising method for treatment of cartilage defect. 相似文献
7.
目的:探讨低分子量硫酸软骨素(CS)在兔软骨修复过程中对于IL-1β、TNF-α和TGF-β及血液中钙磷含量的影响。方法:36只成年新西兰大白兔,随机分成6组,分别为对照组、模型组、低分子量CS低剂量组、低分子量CS高剂量组、高分子量CS低剂量组、高分子量CS高剂量组,每组6只。通过在实验兔股骨髁关节面部位,钻出直径3mm,深度3mm的缺孔,造成其关节软骨的缺损。术后次日给予药物进行灌胃,每日1次,5周后取材。采用酶联免疫法测定关节液中IL-1β、TNF-α和TGF-β的含量,同时用全自动生化分析仪及其配套的试剂盒来测定兔血清中钙,磷含量。结果:低分子量CS和高分子量CS都能够减少关节液中炎性因子的含量和增加TGF-β的含量,且与模型组相比具有统计学意义(P0.05);同时低分子量CS与高分子量CS相比效果较好(P0.05);而高低剂量之间无统计学意义(P0.05)。与模型组相比,给予CS的组别,其血清中的钙磷含量相对较少(P0.05),但都高于对照组。结论:高、低分子量的CS都可以增加TGF-β的含量,降低IL-1β、TNF-α和血清中钙、磷的含量。而对于软骨修复,这可能是通过对上述因子的影响,从而产生积极的作用。 相似文献
8.
Bone repair is one of the major challenges facing reconstructive surgery. Bone regeneration is needed for the repair of large
defects and fractures. The ability of TGF-β1 and IGF-1 incorporated into hydrogel scaffold to induce bone regeneration was
evaluated in a rat tibia segmental defect model. External fixation was performed prior to the induction of the segmental bone
defect in order to stabilize the defect site. Hydrogel scaffold containing either TGF-β, IGF-1, TGF-β + IGF-1, hydrogel containing
saline or saline, were inserted in the defect. Calcified material was observed in the defects treated with TGF-β 2 weeks following
the start of treatment. Bone defects treated with TGF-β, IGF-1 or TGF-β + IGF-1 revealed significant bone formation after
4 and 6 weeks when compared to the control specimens. X-ray images showed that solid bone was present at the defect site after
6 weeks of treatment with TGF-β or TGF-β + IGF-1. A less pronounced bone induction was observed in the control specimens and
bones treated with IGF-1. Percent closure ratio of bone defects after 6 weeks were 40, 80, 89, and 97% for saline, hydrogel,
IGF-1, TGF-β and IGF-1 + TGF-β groups, respectively. It is concluded that hydrogel scaffold can serve as a good osteoconductive
matrix for growth factors, and that it provides a site for bone regeneration and enhances bone defect healing and could be
used as alternative graft material.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
9.
Platelet-rich plasma (PRP) has offered great promise for the treatment of cartilage degradation, and has been proved to have positive effects on the restoration of cartilage lesions. But no comparative work has been done between PRP and hyaluronate acid (HA) concerning their restoring effect on cartilage defect, especially by means of animal experiments and histologic assessments. The purpose of the study was to compare the therapeutic effects of P-PRP and HA on osteoarthritis in rabbit knees. Thirty rabbits were used to establish the animal models by creating a cartilage defect of 5 mm in diameter on the condyles of the femurs, and were randomly divided into three groups: the P-PRP group, HA group and the control group. Then each group was treated with P-PRP, HA or saline solution, respectively. Six and twelve weeks later the rabbits were sacrificed and the samples were collected. The platelet number, the concentrations of growth factors of P-PRP and whole blood, and the IL-1β concentration in the joint fluid were investigated, and the histological assessment of the cartilage were performed according to Mankin''s scoring system. Micro-CT was also used to evaluate the restoration of subchondral bone. The platelet concentration in P-PRP is 6.8 fold of that in the whole blood. The IL-1β level in the P-PRP group was lower than in the HA group (p<0.01) and in the control group (p<0.01). The restoration of the defected cartilage as well as the subchondral bone was better in the P-PRP group than in the HA group or the control group (P<0.05). Our data showed that P-PRP is better than HA in promoting the restoration of the cartilage and alleviating the arthritis caused by cartilage damage. 相似文献
10.
In this study anti-inflammatory effects of the alpha-melanocyte stimulating hormone (α-MSH) on ocular inflammation caused
by extracapsular lens extraction (ECLE) have been investigated and the potential mechanism of an anti-inflammatory effect
is discussed. Pigmented rabbit eyes after ECLE were treated locally with α-MSH, dexamethasone, diclofenac, or saline 4 times
a day (q.i.d.) for 4 weeks. The inhibitory effect of α-MSH on infiltrating cells in the aqueous humor (AqH) was almost twice
as good as that of dexamethasone or diclofenac for 3 days, 1 week, and 2 weeks after the operation. The eyes of Sprague-Dawley
rats were treated with an intravenous injection of α-MSH or saline immediately after ECLE. Six hours postoperatively, the
iris/ciliary body exhibited increased expression of TNF-α and IL-6 mRNAs, which were significantly decreased after α-MSH treatment.
The number of activated NF-kappa B (NFκB)-positive cells in the iris/ciliary body was also significantly reduced by the α-MSH
treatment. These results suggested that α-MSH could effectively reduce ocular inflammation after ECLE, and the potential mechanism
for this is by down-regulating the expression of proinflammatory cytokines and inhibiting the NFκB-dependent signaling pathway. 相似文献
11.
《Saudi Journal of Biological Sciences》2023,30(8):103731
Guar Gum has been evaluated for its importance in food and pharmaceutical industry. A blended biopolymeric hydrogel was prepared by solution casting technique using guar gum (GG), chitosan (CS), polyvinyl alcohol (PVA), chemically crosslinked with tetra orthosilicate (TEOS) and impregnated with methotrexate (MTX) to assess its drug carrying capacity against colon cancer (HCT-116). The surface morphology, chemical bonding, hydrophilicity and water absorbing capacity were analyzed by atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), contact angle measurements and swelling properties in variable conditions. Furthermore, degradation, drug release kinetics, hemocompatibility, and cytotoxicity of MTX-loaded hydrogel was tested. The release of MTX from GG/CS/PVA biopolymeric blend occurred in sustained manner. Results displayed that in 7 h 25 min duration 96% of the drug was released in phosphate buffer saline (PBS) at pH 7.4. These blends were non-hemolytic, and antiproliferative against HCT-116. Furthermore, the MTT assay has revealed that MTX-loaded hydrogel had prominently decreased the cell viability (with IC50 11.7 µg/ml) as compared to free MTX (with IC50 21.57 µg/ml). Hence, these results suggest that guar gum based hydrogels are potential biomaterials for colon cancer treatment. 相似文献
12.
Alfredas Staponas Vida Gražienë Laima Leonavičienë 《Central European Journal of Biology》2007,2(1):87-98
In the present study, we investigate the capability of low concentrations of Papain to stimulate cartilage mesenchymal cells
proliferation and transformation to chondrocytes and evaluate the healing capability of partial thickness defects in medial
condyle cartilage of 30 rabbits’ knee joints. Papain 0.1 mg/ml and Ringer saline l ml each were injected intra-articularly
to rabbits of experimental and control groups (15 animals each). Healthy cartilage from lateral condyle and cartilage from
medial condyle where the surgical defect was created were studied histologically and by TEM. The study revealed that 0.1 mg/ml
Papain activates proliferation and spreading of mesenchymal stem cells to young forms of chondrocyte from perichondrium to the upper layers of healthy cartilage. In only 22.27% cases of the experimental group, surgical defects filled with cartilaginous tissue on the background of distinct
destruction of collagenous matrix in the native cartilage. However, in 55.5% of the control group the defect was spontaneously
healed by hyaline cartilaginous tissue completely or partially on the basis of slight destruction of collagenous matrix. The
defect site was filled with activated chondrocyte-like cells from the subchondral plate (not perichondrium) in both groups, which acquired some cisterns of rough endoplasmic reticulum (RER) and produced matrix
proteins. The results suggest that Papain did not ameliorate the recovery of cartilage defects acquired through surgically-induced
injury of collagenous matrix in native cartilage. We observed that articular cartilage is the source of mesenchymal stem cells
which have the ability to transform into young forms of chondrocytes. This transformation process depends on the level of
destruction of native cartilage collagen matrix induced by the defect or by Papain. 相似文献
13.
The feasibility of using genipin cross-linked type II collagen scaffold with rabbit bone marrow mesenchymal stem cells (RBMSCs)
to repair cartilage defect was herein studied. Induction of RBMSCs into chondrocytic phenotype on type II collagen scaffold
in vitro was conducted using TGF-β 3 containing medium. After 3-weeks of induction, chondrocytic behavior, including marker
genes expression and specific extracellular matrix (ECM) secretion, was observed. In the in vivo evaluation experiment, the
scaffolds containing RBMSCs without prior induction were autologous implanted into the articular cartilage defects made by
subchondral drilling. The repairing ability was evaluated. After 2 months, chondrocyte-like cells with lacuna structure and
corresponding ECM were found in the repaired sites without apparent inflammation. After 24 weeks, we could easily find cartilage
structure the same with normal cartilage in the repair site. In conclusion, it was shown that the scaffolds in combination
of in vivo conditions can induce RBMSCs into chondrocytes in repaired area and would be a possible method for articular cartilage
repair in clinic and cartilage tissue engineering. 相似文献
14.
The acidic α-mannosidase was purified 4400-fold by affinity chromatography on Concavalin A-Sepharose and heat treatment at
65‡C in the presence of 1 mM zinc ion. The enzyme did not resolve into multiple forms as in the case of enzymes from human
liver and human kidney. The pH optimum of the enzyme was 4.2 in citrate-phosphate buffer. The Km value for p-nitrophenyl-α-D-mannose was 1.9 mM. The molecular weight of the enzyme determined by gel filtration was 300,000.
The enzyme contained 10.6% neutral sugars. 相似文献
15.
Delivering isolated chondrocytes with matrix is a promising approach to promote the cartilage repair. The present study attempted to combine the advantages of porous scaffold and hydrogel in delivering chondrocytes to partial-thickness cartilage defects. An electrospun, gelatin-incorporated PLCL scaffold mechanically similar to natural cartilage was fabricated, and chondrocytes were seeded using an injectable heparin-based hydrogel for efficient cell seeding. The scaffold/hydrogel composite showed more enhanced expression of chondrogenic genes and production of GAGs than those prepared without hydrogel. In addition, significant cartilage formation showing good integration with surrounding, similar to natural cartilage, was observed by scaffold/hydrogel composite system in partial-thickness defects of rabbit knees while no regeneration was observed in control defects. Although no exogenous chondrogenic factors were added, it was evident that the scaffold/hydrogel composite system was highly effective and better than the scaffold alone system without hydrogel for cartilage regeneration both in vitro and in vivo. 相似文献
16.
The synthesis of cartilage collagen by rabbit and human chondrocytes in primary cell culture 总被引:2,自引:0,他引:2
Fred H. Schindler Marsha A. Ose Michael Solursh 《In vitro cellular & developmental biology. Plant》1976,12(1):44-47
Summary This report describes a method for preparing primary cell cultures of differentiated rabbit sternal and human vertebral cartilage
cells. These cell cultures were shown to synthesize primarily α1 chains, which is taken to mean that at least 82% of the collagen
produced is cartilage specific collagen (type II).
This work was supported in part by grant HD-05505 from NIH. 相似文献
17.
18.
目的:经微创手术制备膝关节软骨缺损动物模型,减少因手术创伤造成对实验结果的影响。方法:关节镜下对9只山羊(9膝)进行关节面钻孔术,造成软骨缺损模型,对其缺损位置进行准确定位。结果:9只山羊(9膝)均在关节镜下顺利进行了关节软骨缺损模型的建立,并进行了缺损部位的定位。结论:对比开放性手术,经关节镜制备关节缺损模型是一种对实验干预最少的微创方法,有助于减少手术本身造成的实验误差。 相似文献
19.
Yong-Beom Park Chul-Won Ha Jin-A Kim Ji-Heon Rhim Yong-Geun Park Jun Young Chung Han-Jun Lee 《PloS one》2016,11(11)
BackgroundMesenchymal stem cells (MSCs) are known to have therapeutic potential for cartilage repair. However, the optimal concentration of MSCs for cartilage repair remains unclear. Therefore, we aimed to explore the feasibility of cartilage repair by human umbilical cord blood-derived MSCs (hUCB-MSCs) and to determine the optimal concentrations of the MSCs in a rabbit model.MethodsOsteochondral defects were created in the trochlear groove of femur in 55 rabbits. Four experimental groups (11 rabbits/group) were treated by transplanting the composite of hUCB-MSCs and HA with various MSCs concentrations (0.1, 0.5, 1.0, and 1.5 x 107 cells/ml). One control group was left untreated. At 4, 8, and 16 weeks post-transplantation, the degree of cartilage repair was evaluated grossly and histologically.FindingsOverall, transplanting hUCB-MSCs and HA hydrogel resulted in cartilage repair tissue with better quality than the control without transplantation (P = 0.015 in 0.1, P = 0.004 in 0.5, P = 0.004 in 1.0, P = 0.132 in 1.5 x 107 cells/ml). Interestingly, high cell concentration of hUCB-MSCs (1.5×107 cells/ml) was inferior to low cell concentrations (0.1, 0.5, and 1.0 x 107 cells/ml) in cartilage repair (P = 0.394,P = 0.041, P = 0.699, respectively). The 0.5 x 107 cells/ml group showed the highest cartilage repair score at 4, 8 and 16 weeks post transplantation, and followed by 0.1x107 cells/ml group or 1.0 x 107 cell/ml group.ConclusionsThe results of this study suggest that transplantation of the composite of hUCB-MSCs and HA is beneficial for cartilage repair. In addition, this study shows that optimal MSC concentration needs to be determined for better cartilage repair. 相似文献
20.
Janelle-Montcalm A Boileau C Poirier F Pelletier JP Guévremont M Duval N Martel-Pelletier J Reboul P 《Arthritis research & therapy》2007,9(1):R20
In this study we examine the extracellular role of galectin-3 (gal-3) in joint tissues. Following intra-articular injection
of gal-3 or vehicle in knee joints of mice, histological evaluation of articular cartilage and subchondral bone was performed.
Further studies were then performed using human osteoarthritic (OA) chondrocytes and subchondral bone osteoblasts, in which
the effect of gal-3 (0 to 10 μg/ml) was analyzed. Osteoblasts were incubated in the presence of vitamin D3 (50 nM), which is an inducer of osteocalcin, encoded by an osteoblast terminal differentiation gene. Genes of interest mainly
expressed in either chondrocytes or osteoblasts were analyzed with real-time RT-PCR and enzyme immunoassays. Signalling pathways
regulating osteocalcin were analyzed in the presence of gal-3. Intra-articular injection of gal-3 induced knee swelling and
lesions in both cartilage and subchondral bone. On human OA chondrocytes, gal-3 at 1 μg/ml stimulated ADAMTS-5 expression
in chondrocytes and, at higher concentrations (5 and 10 μg/ml), matrix metalloproteinase-3 expression. Experiments performed
with osteoblasts showed a weak but bipolar effect on alkaline phosphatase expression: stimulation at 1 μg/ml or inhibition
at 10 μg/ml. In the absence of vitamin D3, type I collagen alpha 1 chain expression was inhibited by 10 μg/ml of gal-3. The vitamin D3induced osteocalcin was strongly inhibited in a dose-dependent manner in the presence of gal-3, at both the mRNA and protein
levels. This inhibition was mainly mediated by phosphatidylinositol-3-kinase. These findings indicate that high levels of
extracellular gal-3, which could be encountered locally during the inflammatory process, have deleterious effects in both
cartilage and subchondral bone tissues. 相似文献