By Harold C. Slavkin
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Extra info for The Comparative Molecular Biology of Extracellular Matrices
1 9 7 2 ) PNAS 6 9 , 5* p . I 2 5 3 ) . If during this period bromodeoxyuridine (Brdll) is incorporated into the medium at a c o n centration of 1 χ 1 0 " 5 M , subsequent subculture i η the absence of BrdU does not result in c h o n d r o g e n e s i s . Addition of thymidine during subculture over agar inhibits the effect of BrdU; addition of excess thymidine during subculture does not promote chondrog e n e s i s . We have subcultured BrdU-treated cells in the absence of BrdU (up to five times) for a period of kO days with no evidence of c h o n d r o g e n e s i s .
And 15 E X T R A C E L L U L A R MATRICES 50 50 © I DAYS 2 4 6 S DAYS HOURS DAYS 2 4 6 24 Fig. 1-1 Observations on living c u l t u r e s , contrasting agar cultures (c) with liquid medium cultures (d). Chondrogenic differentiation is delayed in cultures floating on liquid medium. Criteria used included visual observations of cartilage nodules in living cultures and histological ρ rocedu res. Fig. 1-2 Observations on living cultures. The improved criterion used in these experiments was the appearance of hyaline zones adjacent to the notochord in agar c u l t u r e s .
They are secreting the components of the matrix similar 23 E X T R A C E L L U L A R MATRICES to a homotypic inductor situation. It could be that the actual inducer is nothing other than the matrix components themselves. By being surrounded by chondrogenic matrix these cells are then turned on to make m o r e ! There is a little evidence from various sources that by adding chondromucoprotein to cells that have developed the ability to form matrix they will form more of them. How or when the cells acquire the ability to chondrify, I have no i dea.
The Comparative Molecular Biology of Extracellular Matrices by Harold C. Slavkin