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- W2023304887 abstract "We have previously shown that SV40 large T oncogene is able to induce mouse chondrocyte proliferation without loss of expression of types II, IX, and XI collagen, as well as cartilage aggrecan and link protein. The cell line obtained (termed MC 615) also expressed some type I collagen in monolayer and we have investigated if anchorage-independent conditions could inhibit type I collagen synthesis and promote hypertrophy and type X collagen synthesis. The MC 615 cells were grown in agarose in the presence of serum, and GAG accumulation, DNA content, and matrix synthesis rates were monitored after incubation with [35S]sulfate and [3H]- or [14C]proline. SDS-PAGE analysis of pepsin-extracted samples showed that type I collagen was still synthesized by the MC 615 cells, from the beginning of the culture and at low or high density. Type II collagen synthesis was demonstrated by immunoblotting, but type X collagen synthesis was not detected, indicating that the MC 615 chondrocytes immortalized by large T were still blocked in their maturation pathway. The cells were also grown over agarose and electron microscopy (E. M.) analysis of the cell aggregates showed an extracellular matrix rich in proteoglycans and in type II-containing collagen fibrils. To gain insight into the role of type IX collagen in cartilage collagen assembly and/or matrix organization, we also immortalized embryonic chondrocytes isolated from mice lacking α1 (IX) collagen and obtained a clone termed 4KO 91. As found for the MC 615 cells, the 4KO 91 cells synthesized type II collagen as demonstrated by Western blotting and some type I collagen identified by the presence of α2(I) chains after electrophoretic analysis of pepsin-digested collagen chains. E. M. analysis of the extracellular matrices synthesized by the two cell lines revealed differences in collagen structure and organization. In the absence of α1(IX) collagen chains, the collagen fibrils seemed to fuse laterally, suggesting that collagen IX acts as a spacer between fibrils, to keep them apart." @default.
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- W2023304887 title "A new method for measuring the local pulse wave velocity by correlating adjacent doppler signals from blood flow" @default.
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