Abstract:
:Polyamines are essential for cell growth and differentiation. Their specific uptake contributes to the regulation of intracellular polyamine levels. In this study, we describe the modulation of this transport mechanism in a rat tumoral pancreatic acinar cell line (AR4-2J) and analyze the transport system characteristics of the normal rat pancreatic acini. Normal acini had a common carrier for spermidine and spermine, like AR4-2J cells, but not a specific putrescine carrier. Intracellular polyamine deprivation enhanced putrescine and spermidine uptake of AR4-2J cells with no modification of polyamine carrier affinity. Uptake was modulated during growth and decreased for both polymaines at confluence. AR4-2J cell differentiation with dexamethasone prevented cell proliferation and diminished uptake of both putrescine and spermidine without affecting their respective carrier affinities. Our data show, first, that the polyamine transport system could be modulated by polyamine metabolism with no change in its affinity characteristics. Second, in rat pancreatic acinar cells, neoplastic transformation was partly characterized by induction of a high-affinity putrescine carrier. This phenotype was not reversed by dexamethasone-induced cell differentiation.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Nicolet T,Scemama JL,Pradayrol L,Berthélémy P,Seva C,Vaysse Ndoi
10.1002/ijc.2910490418subject
Has Abstractpub_date
1991-10-21 00:00:00pages
577-81issue
4eissn
0020-7136issn
1097-0215journal_volume
49pub_type
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