Constitutive expression of parathyroid hormone-related peptide (PTHrP) stimulates growth and inhibits differentiation of CFK2 chondrocytes.

Abstract:

:We have examined the effects of constitutive expression of PTHrP on the growth and differentiation of populations of cells derived from a clonal chondrocytic cell line, CFK2. Cells were stably transfected with cDNA encoding either full-length, secretory PTHrP (CFK2P) or nonsecretory PTHrP (CFK2P-SS). In cultures of cells plated at low density, secretory PTHrP acted as a potent mitogen compared with nonsecretory PTHrP or exogenous PTHrP-(1-34), both of which stimulated only a minor increase in proliferation. In populations of control cells maintained postconfluent for several weeks, there was a dramatic increase in expression of mRNA for type II collagen, aggrecan, and link protein. Addition of exogenous PTHrP-(1-34) at a concentration of 10(-8) M to these cultures was ineffective in inhibiting this time-dependent increase in expression of matrix proteins. In contrast, populations of cells producing either secretory or nonsecretory forms of PTHrP, maintained over the same time period, demonstrated an almost complete inhibition of mRNA expression for matrix proteins. These observations demonstrate that PTHrP acts as a bifunctional modulator of chondrogenesis and that some of its biological activity is exerted via a mechanism distinct from the recognised signal transduction pathways linked to the PTH/PTHrP receptor.

journal_name

J Cell Physiol

authors

Henderson JE,He B,Goltzman D,Karaplis AC

doi

10.1002/(SICI)1097-4652(199610)169:1<33::AID-JCP4>

subject

Has Abstract

pub_date

1996-10-01 00:00:00

pages

33-41

issue

1

eissn

0021-9541

issn

1097-4652

pii

10.1002/(SICI)1097-4652(199610)169:1<33::AID-JCP4>

journal_volume

169

pub_type

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