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US20020005205A1 - Joint repair using mesenchymal stem cells - Google Patents

Joint repair using mesenchymal stem cells Download PDF

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US20020005205A1
US20020005205A1 US09/841,413 US84141301A US2002005205A1 US 20020005205 A1 US20020005205 A1 US 20020005205A1 US 84141301 A US84141301 A US 84141301A US 2002005205 A1 US2002005205 A1 US 2002005205A1
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joint
stem cells
mesenchymal stem
joints
pharmaceutical carrier
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Francis Barry
J. Murphy
Robert Deans
David Fink
Annemarie Moseley
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Mesoblast International SARL
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Priority to US09/841,413 priority Critical patent/US20020005205A1/en
Assigned to OSIRIS THERAPEUTICS, INC. reassignment OSIRIS THERAPEUTICS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FINK, DAVID J., DEANS, ROBERT, MOSELEY, ANNEMARIE, BARRY, FRANCIS P., MURPHY, J. MARY
Publication of US20020005205A1 publication Critical patent/US20020005205A1/en
Priority to US12/132,290 priority patent/US20090041730A1/en
Priority to US13/402,444 priority patent/US20120148548A1/en
Priority to US13/743,004 priority patent/US9050178B2/en
Assigned to MESOBLAST INTERNATIONAL SÀRL reassignment MESOBLAST INTERNATIONAL SÀRL ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OSIRIS THERAPEUTICS, INC.
Priority to US14/687,963 priority patent/US9814580B2/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30756—Cartilage endoprostheses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/38—Joints for elbows or knees
    • A61F2/3872—Meniscus for implantation between the natural bone surfaces
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K35/00—Medicinal preparations containing materials or reaction products thereof with undetermined constitution
    • A61K35/12—Materials from mammals; Compositions comprising non-specified tissues or cells; Compositions comprising non-embryonic stem cells; Genetically modified cells
    • A61K35/28—Bone marrow; Haematopoietic stem cells; Mesenchymal stem cells of any origin, e.g. adipose-derived stem cells
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/0012—Galenical forms characterised by the site of application
    • A61K9/0019—Injectable compositions; Intramuscular, intravenous, arterial, subcutaneous administration; Compositions to be administered through the skin in an invasive manner
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P19/00—Drugs for skeletal disorders
    • A61P19/02—Drugs for skeletal disorders for joint disorders, e.g. arthritis, arthrosis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P19/00—Drugs for skeletal disorders
    • A61P19/04—Drugs for skeletal disorders for non-specific disorders of the connective tissue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
    • C12N5/06—Animal cells or tissues; Human cells or tissues
    • C12N5/0602—Vertebrate cells
    • C12N5/0652—Cells of skeletal and connective tissues; Mesenchyme
    • C12N5/0662—Stem cells
    • C12N5/0663—Bone marrow mesenchymal stem cells (BM-MSC)
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K35/00—Medicinal preparations containing materials or reaction products thereof with undetermined constitution
    • A61K35/12—Materials from mammals; Compositions comprising non-specified tissues or cells; Compositions comprising non-embryonic stem cells; Genetically modified cells
    • A61K2035/124—Materials from mammals; Compositions comprising non-specified tissues or cells; Compositions comprising non-embryonic stem cells; Genetically modified cells the cells being hematopoietic, bone marrow derived or blood cells
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K35/00—Medicinal preparations containing materials or reaction products thereof with undetermined constitution
    • A61K35/12—Materials from mammals; Compositions comprising non-specified tissues or cells; Compositions comprising non-embryonic stem cells; Genetically modified cells
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2510/00—Genetically modified cells

Definitions

  • This invention relates to the repair of joints, which have been injured and/or been subjected to disorders such as osteoarthritis. More particularly, this invention relates to the repair of joints to preventing or reducing subchondral bone sclerosis in a joint, and to preventing damage to the articular cartilage in a joint, and to preventing or reducing the formation of osteophytes in a joint, by administering mesenchymal stem cells to a joint which is in need of repair.
  • Osteoarthritis is one of the most common diseases of the joint. There is radiological evidence of the disease in approximately 70% of individuals over 65 years, with a slightly higher incidence in females. In the age range of 45-65 years, the incidence approaches 30% of the population (American Academy of Orthopedic Surgeons, 1992). Osteoarthritis is a degenerative disease involving erosion of the articular surface at the ends of bones, leading ultimately to complete loss of the cartilage surface and exposure of the subchondral bone. These changes accompany the onset of severe symptoms including loss of motion, stiffness and joint pain. Articular cartilage, once damaged, does not demonstrate significant self-repair. What little tissue repair occurs is typically fibrous in nature and is an inadequate functional true substitute for articular cartilage. A variety of methods have been investigated to enhance the healing of defects in articular cartilage, with varying degrees of success.
  • osteoarthritis is a major disease affecting a large proportion of the population, the causative factors are unknown. Knee injuries involving the meniscus or the anterior cruciate ligament (ACL) significantly increase the development of radiographic gonarthrosis. Meniscal injury alone results in a 20-fold increase in the risk of developing osteoarthritis. In patients that suffer injury to the ACL or other ligaments in combination with meniscus rupture, there is a very high likelihood that osteoarthritis of the knee will develop. (Gillquist and Messner, Sports Med., Vol. 27, pgs. 143-156 (1999)).
  • the adult goat has the advantage of being active and having a structural and tissue organization in the stifle joint that compares well with the human knee.
  • transection of the anterior cruciate ligament resulted in focal defects on the condylar cartilage (Ho, et al., Invest. Radiol., Vol. 27, pgs. 84-90, 1992).
  • surgical transection of the cruciate ligament failed to produce osteoarthritic changes after 8 months in young, confined goats (Rorvik and Tiege, Acta. Vet. Scand., Vol. 37, pgs. 265-272, 1996).
  • ACL resection resulted in osteophyte formation and other subchondral changes and fibrillation of the cartilage surface primarily on the anterior medial condyle.
  • Medial meniscectomy also induced osteophyte formation and other subchondral changes and cartilage lesions mainly confined to the middle medial condyle. These changes were more severe than those found as a result of ACL resection.
  • Medial meniscectomy in combination with ACL resection resulted in advanced osteoarthritic changes to both hard and soft tissue in the goat stifle after 12 weeks.
  • Cartilage on the unprotected medial tibial plateau also was affected although there is some degree of spontaneous osteoarthritis at this site.
  • a method of repairing a joint in an animal comprises administering to the joint mesenchymal stem cells.
  • the animal may be a mammal, and in particular, may be a human or non-human primate.
  • the mesenchymal stem cells may be autologous to the recipient, or may be allogeneic to the recipient.
  • the mesenchymal stem cells may be obtained by means known to those skilled in the art.
  • the mesenchymal stem cells may be obtained from a bone marrow aspirate, and then expanded in culture. Once expanded in culture, the mesenchymal stem cells are administered to the joint.
  • the mesenchymal stem cells may be administered to the joint in conjunction with an acceptable pharmaceutical carrier.
  • a suitable carrier includes, but are not limited to, hyaluronan, chemically modified hyaluronan, saline, phosphate buffered saline, chondroitin sulfate, glucosamine, mannosamine, proteoglycan, proteoglycan fragments, chitin, chitosan, or other polysaccharide or polymer material.
  • mesenchymal stem cells when administered to a joint, provide for the repair and stabilization of a damaged joint, where such damage is due to injury, inflammation, and/or a disease or disorder such as osteoarthritis, for example.
  • the mesenchymal stem cells need not be administered in a scaffold, although a scaffold can be employed.
  • the mesenchymal stem cells When administered to a joint, the mesenchymal stem cells differentiate into cartilaginous tissue, including meniscal tissue.
  • the mesenchymal stem cells when administered to the joint, respond to the destructive forces on the joint, due to the missing and/or damaged tissue, whereby the mesenchymal stem cells differentiate into fibrocartilage tissue.
  • the mesenchymal stem cells when administered to a joint, are capable of replacing missing and/or damaged tissue in the joint, including meniscal tissue.
  • the administration of mesenchymal stem cells to a joint provides for regeneration of cartilaginous tissue, including meniscal tissue, in the joint, thereby providing for repair and stabilization of the joint, as well as reducing pain in the joint and reducing subchondral bone sclerosis.
  • the mesenchymal stem cells may be administered to a joint to provide for the repair and stabilization of damaged, injured, or inflamed joints.
  • the damage, injury, or inflammation may be associated with a disease or disorder, such as osteoarthritis, rheumatoid arthritis, gout, reactive arthritis, psoriatic arthritis, or juvenile arthritis, for example. It also may result from an osteoarthrosis or chronic disease of the joint of noninflammatory character.
  • Joints which may be repaired and/or stabilized, and/or in which inflammation may be reduced, include, but are not limited to, knee joints, hip joints, shoulder joints, elbow joints, ankle joints, tarsal and metatarsal joints, wrist joints, spine, carpal and metacarpal joints, and the temporal mandibular joint.
  • the mesenchymal stem cells are administered in an amount effective to repair and/or stabilize a joint in the recipient.
  • the mesenchymal stem cells are administered in an amount ranging from about 1 ⁇ 10 4 to about 1.5 ⁇ 10 8 , preferably from about 1 ⁇ 10 5 to about 1 ⁇ 10 8 , more preferably from about 1 ⁇ 10 6 to about 1 ⁇ 10 7 .
  • the exact number of cells is dependent upon a variety of factors, including, but not limited to, the age, weight, and sex of the patient, the extent and severity of the damage or injury to the joint, or of the disease affecting the joint, the degree of exudation within the joint, the joint space, and other anatomical characteristics that will influence the delivery.
  • Injury to a specific joint may be determined by common medical practice, including but not limited to X-ray and MRI data, visualization by arthroscopy, and the review of a medical history and physical examination of the patient.
  • FIG. 1 Effect of MSCs on the formation of meniscal-like tissue in goat knees previously destabilized by a combination of ACL resection and medial meniscectomy.
  • Immature meniscal-like tissue black arrow was formed in the area between the medial condyle (MC) and medial tibial plateau (MTP) in knees, previously destabilized by ACL resection and medial meniscectomy and exposed to MSCs, of G151 (A), G154 (B) and G163 (C).
  • FIG. 2 Effect of MSCs on the development of cartilage lesions on the middle medial condyle in goat knees previously destabilized by a combination of ACL resection and medial meniscectomy.
  • Cartilage lesions graded as described in Table 2 and with scores indicated in Table 3 developed on the middle medial condyle of vehicle-only goats (G102, G127, and G143, top panel left, middle and right images, respectively).
  • MSCs injected along with the vehicle prevented the development of severe lesions at this site in several animals, for example, in the case of G151 (bottom panel, middle image) but not in all cases, as in the case of G166 (bottom panel, right image).
  • FIG. 3 Gross appearance of tissue 6 months post-surgery. Gross appearance of the tibial surfaces with menisci attached (A and C) and the anterior and middle medial condyle (B and D) of an osteoarthritic goat knee injected with HA (A and B) and with GFP-transduced MSCs plus HA (C and D). Arrows indicate the meniscal neotissue formed in a joint exposed to MSCs and to a synovial-like proliferation noted in a control goat knee. Asterisk indicates osteophyte formation.
  • FIG. 4 Histological Analysis of Meniscal Neotissue. Fluorescence micrographs of meniscal tissue show GFP-positive cells at the condylar surface of the meniscal neotissue (B and C). A negative micrograph was taken of the posterior of the cut tissue not exposed to the joint environment. Cells in the center of the tissue bound the anti-Type II collagen antibody (D through F). Original magnification was 200 ⁇ for A through E and 100 ⁇ for F.
  • HA-treated group intraarticular injection of sodium hyaluronan
  • H+MSC-treated group intraarticular injection of MSCs suspended in sodium hyaluronan
  • FIG. 6 Macroscopic appearance of tibial plateau of animals treated with allogeneic cells suspended in a solution of sodium hyaluronan either 1 or 6 weeks following complete medial meniscectomy. Control animals were treated by injection with sodium hyaluronan only. In the treated groups the neomeniscal tissue was detached from the tibial plateau and appeared to provide a bearing surface.
  • a total of 12 castrated male Western Cross goats were obtained that were confirmed to be negative for Q fever, brucellosis, and Caprine Arthritis Encephalitis.
  • MSCs mesenchymal stem cells
  • marrow was aspirated from the iliac crest of each goat and mesenchymal stem cells were isolated and cultured from the aspirates using the following procedure. Marrow was added to Complete Human MSC (hMSC) Medium (low-glucose DMEM containing 10% fetal bovine serum from selected lots, and Penicillin-Streptomycin at 10 mL per liter) and centrifuged to pellet the cells and remove the fat layer. The cells were washed with medium and plated on culture dishes at 100,000-400,000 cells/cm 2 . All preparations were cultured at 37° C. in a humidified atmosphere containing 5% CO 2 .
  • hMSC Complete Human MSC
  • DMEM low-glucose DMEM containing 10% fetal bovine serum from selected lots, and Penicillin-Streptomycin at 10 mL per liter
  • Non-adherent cells were removed 3-5 days after plating at the time of the first medium change, and the medium was changed twice weekly thereafter. When culture dishes became almost confluent, cells were detached with 0.05% (w/v) trypsin containing 1 mM EDTA for 5 min at 37° C. For subculturing, MSCs were plated in T-185 flasks at 0.5-1.0 ⁇ 10 6 cells per flask in 35 mL Complete hMSC Medium. MSCs not immediately used were cryopreserved by freezing in MSC Freezing Medium (40 ml of Complete MSC Medium, 5 ml of FBS, and 5 ml of DMSO).
  • Human MSCs may be isolated and cultured according to the method disclosed in U.S. Pat. No. 5,486,359. Human MSCs also may be purchased from BioWhittaker (Walkersville, Md.). The use of allogeneic MSCs is discussed in PCT Application No. PCT/US99/05351.
  • a lateral arthrotomy was performed and the anterior (cranial) cruciate ligament was excised from its attachment on the medial aspect of the lateral femoral condyle using a #11 blade. This proximal attachment was brought forward (anterior) and the entire cruciate ligament was excised from its tibial attachment. The caudal horn of the meniscus was grasped with hemostat and its axial (lateral) attachment was excised from its tibial attachment. Working from caudal to lateral, then cranial, the meniscus was excised from attachments until it was completely removed. The stifle was moved in a drawer test to assure that the entire cruciate ligament had been excised.
  • the joint capsule was closed using absorbable synthetic suture material (examples include Vicryl, PSD, Dexon, Maxon, etc.) in a simple continuous or cruciate pattern.
  • the lateral fascia was closed using 0 or 2-0 absorbable synthetic suture material in a continuous pattern.
  • the subcutaneous tissues were closed using 2-0 absorbable synthetic suture material in a subcuticular pattern.
  • the skin was closed using skin staples.
  • Analgesics were given twice a day for three days, post-operatively. The incision was monitored for signs of infection, including redness, exudate, and excessive swelling. The skin staples/sutures were removed in two weeks. After a recovery period of two weeks, all animals were exercised for five days a week until sacrifice. The exercise regimen consisted of a run approximately 90 m in length.
  • the plasmid pOT24 which includes a polynucleotide sequence encoding GFP protein, was transfected into the GP+E86 packaging cell line, and virus was produced by the modified GP+E86 cells. This virus then was transduced into the PG13 packaging cell line, and virus was produced by the modified PG13 cells.
  • MSCs cryopreserved at the end of primary culture, were thawed and transduced with retrovirus produced from the PG13 (mouse 3T3-based) packaging cell line containing a gibbon-ape envelope (Coffin et al, Retroviruses, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y., pgs. 71-119, 1997).
  • the virus carried the sequence for the enhanced green fluorescent protein of the jellyfish Aequorea victoria.
  • the standard transduction was performed as follows: goat mesenchymal stem cells were cultured at 37° C.
  • Vials containing the cryopreserved transduced goat MSCs were thawed rapidly at 37° C. and added to 40 ml of hMSC Complete Medium. The cells were centrifuged for 5 min at 1500 rpm and 20° C. and resuspended in 5 ml PBS. 50 ⁇ l cell suspension was removed for determination of viable cell count using Trypan Blue. A total of 10 ⁇ 10 6 cells were washed with 20 ml PBS twice and resuspended in 5 ml of 4 mg/ml Hyalartin V (Pharmacia) using a 12-ml syringe with an 18 G needle attached. The cell suspension was aspirated into the syringe for injection into the goat knee and 1-mI PBS added to the tube for washing.
  • the goats were weighed and blood was collected to obtain serum.
  • the knee area was shaved and the goats were anesthetized and intubated.
  • the goat was placed in dorsal recumbency with the knee to be injected held up.
  • the area around the knee was sterilized and the knee was flexed and extended 20 times to circulate synovial fluid.
  • the knee placed in 70-90° flexion, as much fluid as possible was aspirated from the joint and retained for analysis.
  • 10-20 ml PBS was injected into the joint laterally.
  • An 18 G needle was inserted just proximal to the meniscus and posterior to the lateral edge of the patellar ligament, through the triangle formed by the epicondyle of the femur, the meniscal/tibial plateau and the notch formed by their junction. After flexing and extending 20 times the lavage was aspirated from the joint and retained.
  • a three-way stopcock with an 18 G needle attached was inserted into the triangle described above on the medial side of the joint, just medial to the patellar ligament. With the stopcock in the open position, the syringe containing the cell suspension prepared as described above was attached to the stopcock and the cell suspension injected into the joint capsule. Any suspension remaining in the stopcock was washed with 1 ml PBS. The joint was flexed and extended 20 times and the goat was maintained in this position for at least 10 min before recovery and transfer to the holding pen.
  • Group 1 and 2 goats were sacrificed six weeks after injection of transduced cells into the joint.
  • the popliteal and inguinal lymph nodes were collected from both operated and contralateral control limbs before disarticulation at the hip. Radiographs were taken and synovial fluid was collected without lavage and also after a 10 ml PBS lavage. After aspirating the lavage the joint was dissected and the following tissues collected: joint/synovial capsule lining, fat pad, extensor digitorum longus tendon, posterior cruciate ligament and lateral meniscus. Any repair medial meniscal tissue was also collected.
  • the selected areas were located on the protected and unprotected sections of the medial and lateral tibial plateaus, the anterior, middle and posterior sections of the medial condyle, the middle and posterior sections of the lateral condyle, the lateral, central and medial sections of the trochlear ridge and on the patella.
  • cartilage samples from the middle and lateral medial condyles, and from the unprotected area of the medial and lateral tibial plateaus were obtained. Portions of all tissues collected were snap frozen for molecular analysis and fixed in formalin for histological analysis. The joints also were fixed in formalin.
  • Radiography was performed prior to initial surgery, at injection, and at sacrifice.
  • FIGS. 1A, 1B, and 1 C show the appearance and location of the repair tissue for G151, G154 and G163, respectively. In these cases the newly regenerated tissue occupied a slightly posterior location in the joint because of the altered mechanical environment. In the two cases where the tissue was most organized and not as posterior on the joint (G154 and G163), there appeared to be some protection of the cartilage on the middle medial condyle and less osteophyte formation on the femoral condyle and groove indicating less sever osteoarthritis.
  • FIG. 2 shows the degree of protection afforded by the meniscal-like tissue in G151 and G154 (bottom panel).
  • Cartilage damage was significantly less in these joints, which had been injected with MSCs, compared to that found in vehicle-only joints (FIG. 2, top panel).
  • Osteophyte formation on the medial aspect of the medial condyle also was significantly less in these MSC injected joints compared to ‘Vehicle Only’ goats (FIG. 2).
  • Limited fibrous, poorly organized, meniscal repair was observed in 2 of 3 ‘Vehicle Only’ goats on the anterior aspect of the joint. In neither case was the mass or degree of organization as significant as that observed in the ‘+Cells’ group, and there was no apparent protection of the joint as indicated by the Cartilage Score (Table 4).
  • FIG. 3B shows the appearance of the medial condyle of a 6-month control goat with complete degradation of articular cartilage across the entire surface and repopulation of the area with osteophyte. Protection of this surface was noted in test joints exposed to MSCs (FIG. 3D). This effect was not observed in the vehicle only, control joints. Other changes such as joint effusion, osteophyte formation on the femoral condyle and joint broadening also were reduced, consistent with the protective effect of the MSC treatment.
  • One application of the discovery is the reduction of pain by way of meniscal tissue regeneration between opposing bone or osteochondral surfaces.
  • Another application of the above results is to forestall or eliminate the need for joint replacement. Still another application is the reduction of inflammation in a damaged or diseased joint, thus leading to the reduction of pain and to the restoration of function of the joint.
  • Osteophytes were particularly prominent in the control group (FIG. 5, left panel) and these are marked with an arrow.
  • the treated group there was significantly less osteophyte formation associated with those joints where there was evidence of meniscal regeneration (FIG. 5, middle panel) and the condyles had a more symmetrical appearance, suggesting that they may have been less exposed to abnormal mechanical forces.
  • the medial condyles from 2 of the 6 treated animals showed evidence of significant osteophyte formation (FIG. 5, right panel, marked with arrow). In these joints there was less evidence of formation of neomeniscal tissue.
  • the exercise regimen began two weeks after injection and was maintained until sacrifice at 12 weeks following the surgical procedure. Cranial to caudal and lateral radiographs of both stifles were taken prior to the initial surgery and at sacrifice.
  • Exercise The exercise regimen consisted of 12 runs on a circular track of outside circumference of 28.6 m and inside circumference of 16.3 m. This was carried out once a day, five days per week.

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US13/402,444 US20120148548A1 (en) 2000-04-25 2012-02-22 Joint Repair Using Mesenchymal Stem Cells
US13/743,004 US9050178B2 (en) 2000-04-25 2013-01-16 Joint repair using mesenchymal stem cells
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CA2405345A1 (en) 2001-11-01
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PT1276486E (pt) 2011-02-07
US20090041730A1 (en) 2009-02-12
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US9050178B2 (en) 2015-06-09
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JP5090604B2 (ja) 2012-12-05
WO2001080865A9 (en) 2002-12-27
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US20150216904A1 (en) 2015-08-06
US20130131804A1 (en) 2013-05-23
AU2001257236B2 (en) 2006-03-09
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