• PN: B111191


45x Ab-conjugated beads (S4P5 - human OPN Ab-bead). PN: B111191A. One vial containing 100 µL of anti-human OPN conjugated to AimPlex Bead S4P5.

25x Biotin-detection Ab (human OPN Biotin-dAb). PN: B111191B. One vial containing 100 µL of biotinylated anti-human OPN.

Lyophilized Standard Mix-Human Group 4 Panel A. PN: HG4009A. One vial containing lyophilized recombinant human BDNF, beta-NGF, EGF, FGF basic, OPG, OPN, PDGF-AB and VEGF-C.   Note: If multiple analyte kits on the above target list are ordered as a panel, only one vial of standard mix is supplied for those analyte kits.

STORAGE:  2-8 C in the dark.

IMPORTANT: Sodium azide forms explosive compounds with heavy metals. These products contain <0.05% (w/w) azide which with repeated contact with lead and copper commonly found in plumbing drains may result in the buildup of shock sensitive compounds. Dispose in accordance with regulations from your institute.

APPLICATION: Optimal antibody pair and antigen standard for assaying human OPN.  Can be multiplexed with other analytes in Human Group 4.  To be used in conjunction with the AimPlex NR Basic Kit (PN: P100001) and a diluent kit. Refer to the AimPlex Multiplex Immunoassay User Manual and kit inserts for the assay procedure.

For Research Use Only.  Not for use in diagnostic procedures.

Assay Specifications:

Sample types: Cell culture supernatant, serum, plasma, bodily fluid and tissue/cell lysate

Sensitivity (LOD): < 5 pg/mL

Quantitation range:

LLOQ: < 10 pg/mL

ULOQ: > 5,000 pg/mL

Standard dose recovery: 70-130%

Intra-assay CV: < 10%

Inter-assay CV: < 20%

Cross-reactivity of analytes in Human Group 1: Negligible

Sample volume: 15 µL/test


Osteopontin (OPN), also known as bone sialoprotein I (BSP-1 or BNSP), early T-lymphocyte activation (ETA-1), and secreted phosphoprotein 1 (SPP1) is a protein that in humans is encoded by the SPP1 gene (secreted phosphoprotein 1). The murine ortholog is Spp1. Osteopontin is biosynthesized by a variety of tissue types including fibroblasts preosteoblasts, osteoblasts, osteocytes, odontoblasts, some bone marrow cells, hypertrophic chondrocytes, dendritic cells, macrophages, smooth muscle, skeletal muscle myoblasts, endothelial cells, and extraosseous cells in the inner ear, brain, kidney, deciduum, and placenta. Synthesis of osteopontin is stimulated by calcitriol. Diseases associated with SPP1 include tendinitis and calcific tendinitis. The fact that OPN interacts with multiple cell surface receptors that are ubiquitously expressed makes it an active player in many physiological and pathological processes including wound healing, bone turnover, tumorigenesis, inflammation, ischemia, and immune responses1. Therefore, manipulation of plasma (or local) OPN levels may be useful in the treatment of autoimmune diseases, cancer metastasis, bone (and tooth) mineralization diseases, osteoporosis, and some forms of stress.


1.      Wang KX, Denhardt DT (2008). "Osteopontin: role in immune regulation and stress responses". Cytokine Growth Factor Rev. 19 (5-6): 333–45. doi:10.1016/j.cytogfr.2008.08.001. PMID 18952487.

2.      Rangaswami H, Bulbule A, Kundu GC (February 2006). "Osteopontin: role in cell signaling and cancer progression". Trends Cell Biol. 16 (2): 79–87. doi:10.1016/j.tcb.2005.12.005. PMID 16406521.

3.      Young MF, Kerr JM, Termine JD, Wewer UM, Wang MG, McBride OW, Fisher LW (August 1990). "cDNA cloning, mRNA distribution and heterogeneity, chromosomal location, and RFLP analysis of human osteopontin (OPN)". Genomics. 7 (1): 491–502. doi:10.1016/0888-7543(90)90191-V. PMID 1974876.

4.      Sakata M, Tsuruha JI, Masuko-Hongo K, Nakamura H, Matsui T, Sudo A, Nishioka K, Kato T (July 2001). "Autoantibodies to osteopontin in patients with osteoarthritis and rheumatoid arthritis". J. Rheumatol. 28 (7): 1492–5. PMID 11469452