Abstract
Enzymatic crosslinks stabilize type I collagen and are catalyzed by lysyl oxidase (LOX), a step interrupted through β-aminopropionitrile (BAPN) exposure. This study evaluated dose-dependent effects of BAPN on osteoblast gene expression of type I collagen, LOX, and genes associated with crosslink formation. The second objective was to characterize collagen produced in vitro after exposure to BAPN, and to explore changes to collagen properties under continuous cyclical substrate strain. To evaluate dose-dependent effects, osteoblasts were exposed to a range of BAPN dosages (0–10 mM) for gene expression analysis and cell proliferation. Results showed significant upregulation of BMP-1, POST, and COL1A1 and change in cell proliferation. Results also showed that while the gene encoding LOX was unaffected by BAPN treatment, other genes related to LOX activation and matrix production were upregulated. For the loading study, the combined effects of BAPN and mechanical loading were assessed. Gene expression was quantified, atomic force microscopy was used to extract elastic properties of the collagen matrix, and Fourier Transform infrared spectroscopy was used to assess collagen secondary structure for enzymatic crosslinking analysis. BAPN upregulated BMP-1 in static samples and BAPN combined with mechanical loading downregulated LOX when compared to control-static samples. Results showed a higher indentation modulus in BAPN-loaded samples compared to control-loaded samples. Loading increased the mature-to-immature crosslink ratios in control samples, and BAPN increased the height ratio in static samples. In summary, effects of BAPN (upregulation of genes involved in crosslinking, mature/immature crosslinking ratios, upward trend in collagen elasticity) were mitigated by mechanical loading.
This is a preview of subscription content, access via your institution.





References
Burr DB, Allen MR (2013) Basic and applied bone biology, 1st edn. Elsevier, San Diego
Boskey AL, Wright T, Blank R (1999) Collagen and bone strength. J Bone Miner Res 14:330–335
Burr DB (2002) The contribution of the organic matrix to bone’s material properties. Bone 31:8–11. https://doi.org/10.1016/S8756-3282(02)00815-3
Viguet-Carrin S, Garnero P, Delmas PD (2006) The role of collagen in bone strength. Osteoporos Int 17:319–336. https://doi.org/10.1007/s00198-005-2035-9
Avery NC, Sims TJ, Bailey AJ (2009) Quantitative determination of collagen cross-links. Methods Mol Niol 522:103–121. https://doi.org/10.1007/978-1-59745-413-1_6
Eyre DR, Paz M, Gallop P (1984) Cross-linking in collagen and elastin. Annu Rev Biochem 53:717–748. https://doi.org/10.1146/annurev.bi.53.070184.003441
Eyre DR, Wu J-J (2005) Collagen Cross-Links. Top Curr Chem 247:207–229. https://doi.org/10.1007/b103828
Saito M, Marumo K (2010) Collagen cross-links as a determinant of bone quality: a possible explanation for bone fragility in aging, osteoporosis, and diabetes mellitus. Osteoporos Int 21:195–214. https://doi.org/10.1007/s00198-009-1066-z
Dasler W (1954) Isolation of toxic crystals from sweet peas (Lathyrus odoratus). Science 120:307–308
Nimni ME (1977) Mechanism of inhibition of collagen crosslinking by penicillamine. Proc R Soc Med 70(Suppl 3):65–72
Peng J, Jiang Z, Qin G, Huang Q, Li Y, Jiao Z, Zhang F, Li Z, Zhang J, Lu Y, Liu X, Liu J (2007) Impact of activity space on the reproductive behaviour of giant panda (Ailuropoda melanoleuca) in captivity. Appl Anim Behav Sci 104:151–161. https://doi.org/10.1016/j.applanim.2006.04.029
Norris RA, Damon B, Mironov V, Kasyanov V, Ramamurthi A, Moreno-Rodriguez R, Trusk T, Potts JD, Goodwin RL, Davis J, Hoffman S, Wen X, Sugi Y, Kern CB, Mjaatvedt CH, Turner DK, Oka T, Conway SJ, Molkentin JD, Forgacs G, Markwald RR (2007) Periostin regulates collagen fibrillogenesis and the biomechanical properties of connective tissues. J Cell Biochem 101:695–711. https://doi.org/10.1002/jcb.21224
Maruhashi T, Kii I, Saito M, Kudo A (2010) Interaction between Periostin and BMP-1 promotes proteolytic activation of lysyl oxidase. J Biol Chem 285:13294–13303. https://doi.org/10.1074/jbc.M109.088864
Fogelgren B, Polgár N, Szauter KM, Újfaludi Z, Laczkó R, Fong KS, Csiszar K (2005) Cellular fibronectin binds to lysyl oxidase with high affinity and is critical for its proteolytic activation. J Biol Chem 280:24690–24697. https://doi.org/10.1074/jbc.M412979200
Turner CH, Pavalko FM (1998) Mechanotransduction and functional response of the skeleton to physical stress: the mechanisms and mechanics of bone adaptation. J Orthop Sci 3:346–355. https://doi.org/10.1007/s007760050064
Ward DF, Salasznyk RM, Klees RF, Backiel J, Agius P, Bennett K, Boskey A, Plopper GE (2007) Mechanical strain enhances extracellular matrix-induced gene focusing and promotes osteogenic differentiation of human mesenchymal stem cells through an extracellular-related kinase-dependent pathway. Stem Cells Dev 16:467–480. https://doi.org/10.1089/scd.2007.0034
Warden SJ, Galley MR, Hurd AL, Wallace JM, Gallant MA, Richard JS, George LA (2013) Elevated mechanical loading when young provides lifelong benefits to cortical bone properties in female rats independent of a surgically induced menopause. Endocrinology 154:3178–3187. https://doi.org/10.1210/en.2013-1227
McNerny EM, Gong B, Morris MD, Kohn DH (2015) Bone fracture toughness and strength correlate with collagen cross-link maturity in a dose-controlled lathyrism mouse model. J Bone Miner Res 30:455–464. https://doi.org/10.1002/jbmr.2356
Hammond MA, Wallace JM (2015) Exercise prevents β-aminopropionitrile-induced morphological changes to type I collagen in murine bone. Bonekey Rep 4:645. https://doi.org/10.1038/bonekey.2015.12
Canelón SP, Wallace JM (2016) β-Aminopropionitrile-induced reduction in enzymatic crosslinking causes in vitro changes in collagen morphology and molecular composition. PLoS ONE 11:1–13. https://doi.org/10.1371/journal.pone.0166392
Fernandes H (2009) The role of collagen crosslinking in differentiation of human mesenchymal stem cells and MC3T3-E1 cells. Tissue Eng A 15:3857–3867
Thaler R, Spitzer S, Rumpler M, Fratzl-Zelman N, Klaushofer K, Paschalis E, Varga F (2010) Differential effects of homocysteine and beta aminopropionitrile on preosteoblastic MC3T3-E1 cells. Bone 46:703–709. https://doi.org/10.1016/j.bone.2009.10.038
Turecek C, Fratzl-Zelman N, Rumpler M, Buchinger B, Spitzer S, Zoehrer R, Durchschlag E, Klaushofer K, Paschalis E, Varga F (2008) Collagen cross-linking influences osteoblastic differentiation. Calcif Tissue Int 82:392–400. https://doi.org/10.1007/s00223-008-9136-3
Schmittgen TD, Zakrajsek BA (2000) Effect of experimental treatment on housekeeping gene expression: validation by real-time, quantitative RT-PCR. J Biochem Biophys Methods 46:69–81. https://doi.org/10.1016/S0165-022X(00)00129-9
Pfaffl MW (2001) A new mathematical model for relative quantification in real-time RT-PCR. Nucleic Acids Res 29:45e-45. https://doi.org/10.1093/nar/29.9.e45
Pfaffl MW, Horgan GW, Dempfle L (2002) Relative expression software tool (REST(C)) for group-wise comparison and statistical analysis of relative expression results in real-time PCR. Nucleic Acids Res 30:36e-36. https://doi.org/10.1093/nar/30.9.e36
Vande Geest JP, Di Martino ES, Vorp DA (2004) An analysis of the complete strain field within Flexercell(TM) membranes. J Biomech 37:1923–1928. https://doi.org/10.1016/j.jbiomech.2004.02.022
Yang H, Yang S, Kong J, Dong A, Yu S (2015) Obtaining information about protein secondary structures in aqueous solution using Fourier transform IR spectroscopy. Nat Protoc 10:382–396. https://doi.org/10.1038/nprot.2015.024
Dong A, Huang P, Caughey WS (1990) Protein secondary structures in water from second-derivative amide I infrared spectra. Biochemistry 29:3303–3308. https://doi.org/10.1021/bi00465a022
Paschalis E, Verdelis K, Doty SB, Boskey AL, Mendelsohn R, Yamauchi M (2001) Spectroscopic characterization of collagen cross-links in bone. J Bone Miner Res 16:1821–1828. https://doi.org/10.1359/jbmr.2001.16.10.1821
Paschalis E, Gamsjaeger S, Tatakis D, Hassler N, Robins S, Klaushofer K (2014) Fourier transform infrared spectroscopic characterization of mineralizing type I collagen enzymatic trivalent cross-links. Calcif Tissue Int 96:18–29. https://doi.org/10.1007/s00223-014-9933-9
Kemp AD, Harding CC, Cabral WA, Marini JC, Wallace JM (2012) Effects of tissue hydration on nanoscale structural morphology and mechanics of individual Type I collagen fibrils in the Brtl mouse model of Osteogenesis Imperfecta. J Struct Biol 180:428–438. https://doi.org/10.1016/j.jsb.2012.09.012
Quarles LD, Yohay DA, Lever LW, Caton R, Wenstrup RJ (1992) Distinct proliferative and differentiated stages of murine MC3T3-E1 cells in culture: an in vitro model of osteoblast development. J Bone Miner Res 7:683–692. https://doi.org/10.1002/jbmr.5650070613
Acknowledgements
The authors are grateful to the IU School of Medicine Department of Anatomy & Cell Biology, particularly Dr. William Thopmson, for providing access to the Flexcell system and laboratory space, as well as Donna Roskowski in the IUPUI Department of Chemistry and Chemical Biology for providing access to the Nicolet iN 10 infrared microscope.
Funding
This work was supported by funding from the National Institutes of Health (AR072609, AR067221).
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflict of interest
Silvia P. Canelón, Joseph M. Wallace have stated that they have no conflicts of interest.
Human and Animal Rights
This article does not contain any studies with human participants or animals performed by any of the authors.
Informed Consent
This article does not contain any studies with human participants performed by any of the authors.
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Canelón, S.P., Wallace, J.M. Substrate Strain Mitigates Effects of β-Aminopropionitrile-Induced Reduction in Enzymatic Crosslinking. Calcif Tissue Int 105, 660–669 (2019). https://doi.org/10.1007/s00223-019-00603-3
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00223-019-00603-3