Effects of secreted factors in culture medium of annulus fibrosus cells on microvascular endothelial cells: elucidating the possible pathomechanisms of.

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Presentation transcript:

Effects of secreted factors in culture medium of annulus fibrosus cells on microvascular endothelial cells: elucidating the possible pathomechanisms of matrix degradation and nerve in-growth in disc degeneration H.J. Moon, T. Yurube, T.P. Lozito, P. Pohl, R.A. Hartman, G.A. Sowa, J.D. Kang, N.V. Vo Osteoarthritis and Cartilage Volume 22, Issue 2, Pages 344-354 (February 2014) DOI: 10.1016/j.joca.2013.12.008 Copyright © 2014 Terms and Conditions

Fig. 1 Experimental design. The media collected from AF culture (STEP 1) is referred in text as AFCM. HMEC-1 cells were then cultured with AFCM for 48 h (STEP 2) to obtain experimental conditioned media (ExpCM) and experimental endothelial cells (ExpEC). For controls, HMEC-1 cells were cultured with naïve media to obtain control conditioned media (CtrCM) and control endothelial cells (CtrEC). VEGF and IL-8 from AFCM were determined by ELISA. MMP and PDGF mRNA levels from expEC and ctrEC were determined by RT-PCR. MMP and PDGF proteins from expCM and ctrCM were measured by ELISA and Western. Intracellular PDGF of expEC and ctrEC was assayed by immunofluorescence. The independent samples from four different patients were tested, each sample was done in duplicate. Values represent the average of four independent experiments (VEGF and IL-8 measurement were from seven independent experiments) ± 95% confidence interval (95% CI). Osteoarthritis and Cartilage 2014 22, 344-354DOI: (10.1016/j.joca.2013.12.008) Copyright © 2014 Terms and Conditions

Fig. 2 Morphological characterization of HMEC-1 cells. The formation of capillary-like structures was observed in HMEC-1 cell culture on the Matrigel (100× magnification). Six hours after seeding on the Matrigel, the cells began to coalesce to form branching network (B), and this continued (C–D) until 24 h when a network of interconnected thickened loops was completed. These cellular morphologies are characteristic of ECs grown on Matrigel. Osteoarthritis and Cartilage 2014 22, 344-354DOI: (10.1016/j.joca.2013.12.008) Copyright © 2014 Terms and Conditions

Fig. 3 Effect of HMEC-1 on matrix gene expression of AF cells. AF cells were exposed for 2 days to the conditioned culture media of HMEC-1 (ECCM) or naïve media as a control (A) and qRT-PCR was performed to measure the levels matrix gene expression of aggrecan, collagen type 1 and type 2. Compared to naïve media, AF cultured in ECCM expressed lower mRNA level of collagen II (0.48×) while mRNA levels of collagen I and aggrecan showed no significant differences between the two groups. Values are mean ± 95% CI of n = 4. *: P < 0.05 vs CtrAF. Osteoarthritis and Cartilage 2014 22, 344-354DOI: (10.1016/j.joca.2013.12.008) Copyright © 2014 Terms and Conditions

Fig. 4 VEGF and IL-8 production from AF cell culture. AF cell culture derived from degenerative disc tissue, in the absence of any additional stimulus, expressed and secreted considerable amounts of the key pro-angiogenic activators of ECs, VEGF and IL-8. (A) VEGF and IL-8 from AFCM were measured by ELISA. Values are mean ± 95% CI of n = 7. (B) Immunofluorescence also revealed intracellular distribution of VEGF throughout the AF cells. Osteoarthritis and Cartilage 2014 22, 344-354DOI: (10.1016/j.joca.2013.12.008) Copyright © 2014 Terms and Conditions

Fig. 5 Influence of AF cell culture conditioned media on PDGF expression from HMEC-1 cells. (A) Compared to ECs cultured in naïve media (CtrEC; circles), ECs cultured in AFCM (ExpEC; triangles) expressed significantly higher amount of PDGF-B mRNA at all the time points tested. Values are mean ± 95% CI of n = 4. *P < 0.05 vs CtrEC. (B) Western analysis detected secretion of PDGF-B only in ExpCM and not in AFCM or CtrCM. (n = 4). (C) Immunofluorescence data revealed condensed cytoplasmic PDGF-B localized into a Golgi in HMEC-1 cultured in AFCM (bottom panel) for extracellular release by exocytosis, whereas HMEC-1 cultured in naïve media display a nuclear staining for PDGF-B (top panel). Osteoarthritis and Cartilage 2014 22, 344-354DOI: (10.1016/j.joca.2013.12.008) Copyright © 2014 Terms and Conditions

Fig. 6 Influence of AF cell culture conditioned media on MMPs expression from HMEC-1 cells. (A) qRT-PCR measurement of MMP mRNAs. Compared to ECs exposed to naïve media (CtrEC), ECs cells exposed to AF conditioned media (ExpEC) significantly up-regulated MMP-2 and MMP-13 while down regulated MMP-1 mRNA expression. MMP-14 mRNA levels remained unchanged between the two groups. Values are mean ± 95% CI of n = 4. *: P < 0.05 vs CtrEC. (B) Western analysis of MMP proteins in culture condition media. Western results confirmed mRNA results, showing enhanced secretion of MMP-2 and MMP-13 in ExpCM compared to those in AFCM and CtrCM. MMP-2 in ExpCM was not only up-regulated in total amount, but the increase was also mainly in the active form (66 kDa) of MMP-2. MMP-14 protein was not significantly changed in ExpEC relative to CtrEC. “Relative Expression Change” represented relative value compared to reference value of AFCM, which is normalized to 1. Values of each quantification are mean ± 95% CI of n = 4. *: P < 0.05. Osteoarthritis and Cartilage 2014 22, 344-354DOI: (10.1016/j.joca.2013.12.008) Copyright © 2014 Terms and Conditions

Fig. 7 Influence of AF cell culture conditioned media on NGF expression from HMEC-1 cells. (A) ELISA assay showed that ECs cells exposed to AF conditioned media (ExpCM) significantly up-regulated NGF in a time-dependent manner. This is in contrast to the undetectable level of NGF in the culture media of ECs exposed to naïve media (CtrCM). (B) Immunofluorescence assay revealed an increase in intracellular NGF in HMEC-1 treated with AF conditioned media (ExpEC) compared to HMEC-1 culture alone (CtrEC). However, the presence of NGF-immunopositive cells in the CtrEC group suggests that HMEC-1 express but do not secrete NGF under unstimulated condition. Values are mean ± 95% CI of n = 4. *P < 0.05. Osteoarthritis and Cartilage 2014 22, 344-354DOI: (10.1016/j.joca.2013.12.008) Copyright © 2014 Terms and Conditions

Fig. 8 A schematic summary of the paracrine interaction between ECs and AF cells. AF cells secrete factors, possibly IL-8 and VEGF, which upregulate EC production of key MMPs (A) and NGF (C). NGF and MMP are important mediators of nerve in-growth and matrix degradation, respectively. Conversely, ECs secrete factors which alter matrix gene expression of AF cells (B). Osteoarthritis and Cartilage 2014 22, 344-354DOI: (10.1016/j.joca.2013.12.008) Copyright © 2014 Terms and Conditions