Herein, we showed that conditioned media derived from human fetal MSC (CM-hfMSCs) expressed high level of the insulin growth factor binding proteins IGFBPs and can sequester free insulin-like growth factors (IGFs) to inhibit HCC cell proliferation.
Culture media derived from these experiments were used in in-vitro Treg differentiation assays.
As shown in Fig. 5A, media derived from M10 cells presented high MMP-2 and MMP-9 activity.
Mammospheres grown as described above were incubated for 5 days in 25% (volume) conditioned media derived from MSC spheroids.
Zymography was used to detect protease activity of conditioned media derived from cells representing the ECM modifying phenotypes.
Zymography assay was done on serum-free conditioned media derived from control cells or cells stably transfected with α1-PDX [25], [32].
Media derived from LoVo cells transfected with proVEGF-C alone, failed to induce significant Akt (Fig. 3A, Control) and ERK (Fig. 3B, Control) tyrosine phosphorylation.
Similarly, pretreatment of ZF4 cells with media derived from LoVo cells transfected with vectors expressing mutated unprocessed proVEGF-C for 6 h, prior their incubation with media derived from LoVo cells transfected with vector expressing wild-type proVEGF-C inhibited cell proliferation induced by media containing processed VEGF-C (Fig.8C).
Similarly, incubation of ZF4 cells with media derived from LoVo cells co-transfected with proVEGF-C and Furin constructs significantly induced cell proliferation as compared to media derived from LoVo cells transfected with empty vector (Control) or proVEGF-C alone (Fig. 4A).
Analysis of media derived from LoVo cells co-transfected with proVEGF-C and empty vector (Control) revealed only one immunoreactive protein with an apparent molecular mass of ∼59 kDa, corresponding to the intact zebrafish proVEGF-C precursor (Fig. 1B).
Figure 6 depicts in-vitro differentiation of CD4+CD3+GFP− cells from the spleen of Foxp3gfp.KI mice in response to conditioned media derived from untreated, interleukin-4, or IFN-γ primed; LPS-stimulated macrophages.
