Membrane function in cystic fibrosis. I. Putrescine transport in normal and cystic fibrosis fibroblasts.

Putrescine transport was examined in normal and cystic fibrosis fibroblasts. No differences 
were observed in accumulation pattern, kinetics of uptake, or efflux between 
CF and normal cells. In both growing and growth-arrested CF and 
normal fibroblasts, exogenously supplied putrescine remained unchanged for at least 60 
min. Some differences were observed in the response of CF and 
normal cells to environmental (media) changes. 