Recycling of epidermal growth factor in a human pancreatic carcinoma cell line

M. Korc, B. E. Magun

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

PANC-1 human pancreatic carcinoma cells readily bound and internalized 125I-labeled epidermal growth factor (EGF). Bound 125I-labeled EGF was then partially processed to a number of high molecular weight acidic species. Percoll gradient centrifugation of cell homogenates indicated that the majority of 125I activity localized to several intracellular vesicular compartments. Both intact EGF and its processed species were subsequently released into the incubation medium. A major portion of the released radioactivity was capable of rebinding to the cell. Only a small amount of bound 125I-labeled EGF was degraded to low molecular weight products, and this degradation was completely blocked by methylamine. This lysosomotropic compound did not arrest either the generation or the extrusion of the major high molecular weight species of processed EGF (pI 4.2). These findings suggest that in PANC-1 cells, bound EGF undergoes only limited processing. Both intact EGF and its major processed species bypass the cellular degradative pathways, are slowly released from the cell, and then rebind to the cell.

Original languageEnglish (US)
Pages (from-to)6172-6175
Number of pages4
JournalProceedings of the National Academy of Sciences of the United States of America
Volume82
Issue number18
DOIs
StatePublished - 1985

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