Introduction
Materials and methods
Cartilage procurement and processing
Primary culture of chondrocytes
Chondrocyte metabolic labeling and differential treatment of SILAC cell populations
Processing of conditioned media for analysis by LC-MS
Nano-scale LC-MALDI-MS analysis
Data analysis
Real-time PCR assays
Western blot analysis
Immunohistochemical analysis
Statistical analysis
Results and discussion
Secretome profiling of IL-1β and CS-treated HACs
Symbol | Score | Peptides (95%) | Covariance (%) | Accession numbera | Name | Function | OA serum
[22]
| OA synovial fluid
[23]
|
---|---|---|---|---|---|---|---|---|
MMP2 | 20.24 | 17 | 36.4 | [P08253] | 72 kDa type IV collagenase | Angiogenesis/collagen degradation | x | |
A1AT | 2 | 2 | 6 | [P01009] | Alpha-1-antitrypsin | Inhibitor of serine proteases | ||
ANXA2 | 2 | 1 | 36 | [P07355] | Annexin A2 | Heat-stress response | ||
B2MG | 4 | 3 | 26.9 | [P61769] | Beta-2-microglobulin | Immunity | x | |
PGS1 | 4.03 | 3 | 13.9 | [P21810] | Biglycan | Collagen fiber assembly/ECM component | ||
CATB | 3.06 | 2 | 15.3 | [P07858] | Cathepsin B | Thiol protease | ||
CCL2 | 6 | 4 | 38.4 | [P13500] | C-C motif chemokine 2b | Inflammatory response | ||
CCL8 | 4 | 2 | 38.4 | [P80075] | C-C motif chemokine 8b | Inflammatory response | ||
CH3L1 | 63.26 | 96 | 82 | [P36222] | Chitinase-3-like protein 1 | ECM component | x | |
CH3L2 | 2 | 2 | 17.7 | [Q15782] | Chitinase-3-like protein 2b | ECM component | ||
CLUS | 10.09 | 9 | 43.2 | [P10909] | Clusterin | Immunity | x | x |
CCD80 | 2 | 1 | 23.3 | [Q76M96] | Coiled-coil domain-containing protein 80 | Cell adhesion and matrix assembly | ||
CO3A1 | 2.02 | 1 | 14.3 | [P02461] | Collagen alpha-1(III) chain | ECM component | ||
CO6A1 | 4.16 | 4 | 28.5 | [P12109] | Collagen alpha-1(VI) chain | ECM component | ||
COCA1 | 17.35 | 10 | 21.1 | [Q99715] | Collagen alpha-1(XII) chain | ECM component | ||
CO1A2 | 27.65 | 25 | 55.2 | [P08123] | Collagen alpha-2(I) chain | ECM component | ||
C1R | 8.13 | 7 | 31.5 | [P00736] | Complement C1r subcomponent | Immunity | x | x |
C1S | 10.6 | 9 | 27.3 | [P09871] | Complement C1s subcomponent | Immunity | x | x |
CO3 | 13.4 | 7 | 26.4 | [P01024] | Complement C3 | Immunity | x | |
CFAB | 8.29 | 6 | 17.2 | [P00751] | Complement factor B | Immunity | x | x |
CXCL3 | 4.01 | 4 | 69.2 | [P19876] | C-X-C motif chemokine 3b | inflammatory response | ||
CXCL5 | 2 | 1 | 20.2 | [P42830] | C-X-C motif chemokine 5b | Inflammatory response | ||
CXCL6 | 4.13 | 5 | 38.6 | [P80162] | C-X-C motif chemokine 6b | Inflammatory response | ||
CYTC | 4 | 3 | 67.1 | [P01034] | Cystatin-C | Inhibitor of cysteine proteinases | x | |
PGS2 | 23.72 | 22 | 56 | [P07585] | Decorin | ECM component | ||
DESP | 2 | 1 | 24.8 | [P15924] | Desmoplakinb | Cell junction | x | |
FBLN3 | 15.7 | 12 | 31.2 | [Q12805] | EGF-containing fibulin-like extracellular matrix protein 1 | Negative regulator of chondrocyte differentiation | x | x |
FINC | 152.34 | 150 | 58.9 | [P02751] | Fibronectin | ECM component | x | x |
FBLN1 | 2 | 1 | 11.2 | [P23142] | Fibulin-1 | Cell adhesion/ECM organization | x | |
FSTL1 | 2.1 | 2 | 16.2 | [Q12841] | Follistatin-related protein 1 | Cell proliferation and differentiation | ||
GDN | 24.73 | 23 | 54.5 | [P07093] | Glia-derived nexin | Serine protease inhibitor | ||
GROA | 4 | 5 | 54.2 | [P09341] | Growth-regulated alpha protein | Inflammatory response | ||
IBP3 | 12.02 | 12 | 57.7 | [P17936] | Insulin-like growth factor-binding protein 3 | Cell proliferation and differentiation | x | |
IBP4 | 3.36 | 3 | 37.6 | [P22692] | Insulin-like growth factor-binding protein 4 | Cell proliferation and differentiation | ||
IBP5 | 4.03 | 2 | 55.5 | [P24593] | Insulin-like growth factor-binding protein 5 | Cell proliferation and differentiation | ||
IBP6 | 3.85 | 3 | 43.8 | [P24592] | Insulin-like growth factor-binding protein 6 | Cell proliferation and differentiation | x | |
IBP7 | 2.15 | 3 | 29.1 | [Q16270] | Insulin-like growth factor-binding protein 7 | Cell proliferation and differentiation | ||
IL6 | 16 | 16 | 42 | [P05231] | IL-6 | Inflammatory response | ||
IL8 | 4.24 | 6 | 57.6 | [P10145] | IL-8 | Inflammatory response | ||
MMP1 | 35.12 | 38 | 50.1 | [P03956] | Interstitial collagenase | Collagen degradation | ||
K1C10 | 60.82 | 36 | 66.8 | [P13645] | Keratin, type I cytoskeletal 10 | Intermediate filament | x | x |
K1C14 | 11.36 | 7 | 44.9 | [P02533] | Keratin, type I cytoskeletal 14b | Intermediate filament | ||
K1C16 | 15.45 | 8 | 48 | [P08779] | Keratin, type I cytoskeletal 16b | Intermediate filament | ||
K1C9 | 30.98 | 19 | 60.2 | [P35527] | Keratin, type I cytoskeletal 9 | Intermediate filament | x | x |
K2C1 | 70.89 | 41 | 69.6 | [P04264] | Keratin, type II cytoskeletal 1 | Intermediate filament | x | x |
K22E | 43.26 | 22 | 69.2 | [P35908] | Keratin, type II cytoskeletal 2 epidermal | Intermediate filament | x | x |
K2C6B | 20.77 | 11 | 53.9 | [P04259] | Keratin, type II cytoskeletal 6Bb | Intermediate filament | x | |
MFGM | 6.01 | 4 | 20.9 | [Q08431] | Lactadherin | Angiogenesis | ||
LUM | 28.15 | 30 | 60.7 | [P51884] | Lumican | ECM component | x | x |
CSF1 | 4.01 | 2 | 17.3 | [P09603] | Macrophage colony-stimulating factor 1b | Inflammatory response | ||
TIMP1 | 17.8 | 16 | 57.5 | [P01033] | Metalloproteinase inhibitor 1 | Metalloprotease inhibitor | x | |
TIMP2 | 4 | 3 | 32.7 | [P16035] | Metalloproteinase inhibitor 2 | Metalloprotease inhibitor | ||
PTX3 | 2.02 | 2 | 14.4 | [P26022] | Pentraxin-related protein PTX3 | Inflammatory response | ||
PLTP | 5.8 | 4 | 31 | [P55058] | Phospholipid transfer protein | Lipid transport | x | x |
IC1 | 4 | 2 | 18.8 | [P05155] | Plasma protease C1 inhibitor | Immunity | x | x |
POTEF | 2.03 | 1 | 27.6 | [A5A3E0] | POTE ankyrin domain family member Fb | Unknown | ||
SAP | 2 | 1 | 5 | [P07602] | Proactivator polypeptideb | Lipid metabolism | ||
PCOC1 | 5.93 | 4 | 19.8 | [Q15113] | Procollagen C-endopeptidase enhancer 1 | Collagen metabolism | x | |
S10A8 | 1.54 | 1 | 35.5 | [P05109] | Protein S100-A8b | Inflammatory response | x | |
S10A9 | 4 | 2 | 34.2 | [P06702] | Protein S100-A9b | Inflammatory response | x | |
PRG4 | 3.7 | 3 | 21.9 | [Q92954] | Proteoglycan 4b | ECM component | x | x |
TRY6 | 4 | 2 | 15.4 | [Q8NHM4] | Putative trypsin-6b | Serine protease | ||
NPT2C | 2 | 1 | 10.9 | [Q8N130] | Sodium-dependent phosphate transport protein 2Cb | Ion transport | ||
SPRC | 2 | 2 | 7.3 | [P09486] | SPARC | Cell proliferation and differentiation | x | |
MMP3 | 48.64 | 47 | 71.9 | [P08254] | Stromelysin-1 | Collagen degradation | x | |
QSOX1 | 4.87 | 4 | 16.3 | [O00391] | Sulfhydryl oxidase 1 | Cell redox homeostasis | x | |
SDC4 | 2 | 1 | 13.6 | [P31431] | Syndecan-4 | ECM component | ||
TARSH | 8.86 | 9 | 27.4 | [Q7Z7G0] | Target of Nesh-SH3 | Cell proliferation and differentiation | x | |
TENA | 13.36 | 8 | 22.5 | [P24821] | Tenascin | Cell adhesion/ECM organization | ||
TETN | 4 | 4 | 34.2 | [P05452] | Tetranectin | Bone mineralization | x | x |
TSP1 | 2.36 | 2 | 18.5 | [P07996] | Thrombospondin-1 | Angiogenesis | x | |
BGH3 | 2 | 1 | 22.6 | [Q15582] | TGF-beta-induced protein ig-h3 | TGF-beta signaling | x | |
TSG6 | 28.35 | 30 | 69.3 | [P98066] | TNF-inducible gene 6 protein | Cell adhesion | ||
VCAM1 | 2 | 1 | 12.2 | [P19320] | Vascular cell adhesion protein 1 | Cell adhesion | x | |
VASN | 2 | 2 | 14.7 | [Q6EMK4] | Vasorin | TGF-beta signaling | x |
CS-mediated changes in the chondrocyte secretome
Accession numbera | Name | Symbol | Ratiob | Pvalue | Error factorc |
---|---|---|---|---|---|
[P00751] | Complement factor B | CFAB | 0.5566 | 0.0064 | 1.397 |
[Q08431] | Lactadherin | MFGM | 0.597 | 0.0151 | 1.3855 |
[Q7Z7G0] | Target of Nesh-SH3 | TARSH | 0.7017 | 0.006 | 1.2209 |
[P09871] | Complement C1s subcomponent | C1S | 0.7085 | 0.0007 | 1.1398 |
[P01024] | Complement C3 | CO3 | 0.7241 | 0.0023 | 1.1999 |
[P02751] | Fibronectin | FINC | 0.7321 | 0.0006 | 1.1891 |
[P03956] | Interstitial collagenase | MMP1 | 0.7113 | 0 | 1.0977 |
[P00736] | Complement C1r subcomponent | C1R | 0.7734 | 0.0071 | 1.1755 |
[P08253] | 72 kDa type IV collagenase | MMP2 | 0.7759 | 0.0001 | 1.0999 |
[P36222] | Chitinase-3-like protein 1 | CH3L1 | 0.8088 | 0.0216 | 1.4096 |
[P10909] | Clusterin | CLUS | 0.8224 | 0.05 | 1.2162 |
[P08254] | Stromelysin-1 | MMP3 | 0.8256 | 0.0086 | 1.1378 |
[P07093] | Glia-derived nexin | GDN | 1.2894 | 0.0031 | 1.1664 |
[O00391] | Sulfhydryl oxidase 1 | QSOX1 | 1.3064 | 0.0382 | 1.2709 |
[Q92954] | Proteoglycan 4 | PRG4 | 1.4393 | 0.05 | 1.445 |
[P98066] | TNF-inducible gene 6 protein | TSG6 | 1.7773 | 0.0007 | 1.3371 |
[P61769] | Beta-2-microglobulin | B2MG | 2.1652 | 0.0125 | 1.4553 |
[P07996] | Thrombospondin-1 | TSP1 | 89.1678 | 0 | >2 |