Apr 15, 1976

The route of secretion of procollagen. The influence of alphaalpha'-bipyridyl, colchicine and antimycin A on the secretory process in embryonic-chick tendon and cartilage cells

The Biochemical Journal
R HarwoodD S Jackson

Abstract

I. Embryonic-chick tendon cells were pulse-labelled for 4 min with [14C]proline and the 14C-labelled polypeptides were chased with unlabelled proline for up to 30 min. Isolation of subcellular fractions during the chase period and their subsequent analysis for bacterial collagenase-susceptible 14C-labelled peptides demonstrated the transfer of procollagen polypeptides from rough to smooth microsomal fractions and thence to the extracellular medium. Parallel analyses of Golgi-enriched fractions indicated the involvement of this organelle in the secretory pathway of procollagen. Sodium dodecylsulphate/polyacrylamide-gel electrophoresis of the 14C-labelled polypeptides present in the Golgi-enriched fractions demonstrated that the procollagen polypeptides were all present as disulphide-linked pro-gamma components. 2. When similar kinetic studies of the intracellular transport of procollagen were conducted with embryonic-chick cartilage cells almost identical results were obtained, but the rate of translocation of cartilage procollagen was significantly slower than that observed for tendon procollagen. 3. When hydroxylation of procollagen polypeptides was inhibited by alphaalpha'-bipyridyl, the nascent polypeptides accumulated in th...Continue Reading

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Mentioned in this Paper

Embryo
Tendinopathy
Pyridines
Golgi Apparatus
Extracellular
Smooth Endoplasmic Reticulum
Secretory Pathway
Intracellular Transport
Protoplasm
Tendons, Para-Articular

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