Abstract:
:Stimulation of amiloride-sensitive sodium (Na+) influx and the subsequent activation of NA+, K+-ATPase by serum or growth factors have been implicated as early events leading to initiation of cell proliferation. We recently demonstrated that amiloride inhibits thrombin-initiated DNA synthesis not by inhibiting an early event occurring during the first 8 hr, but rather by inhibiting some later event 8 to 12 hr after thrombin addition. To further probe the relationship between stimulation of ion influx and initiation of cell proliferation, human alpha-thrombin was converted to gamma-thrombin, nitro-alpha-thrombin, and diisopropylphospho (DIP)-alpha-thrombin. These derivatives retain either the capacity to bind cell surface alpha-thrombin receptors or thrombin esterase activity, but they do not initiate DNA synthesis. At low concentrations of alpha-thrombin or the various thrombin derivatives, only alpha-thrombin stimulates 86Rb+ influx, suggesting a correlation between stimulation of influx and the ability of these derivatives to initiate DNA synthesis. Concentrations of a DIP-alpha-thrombin that saturate the alpha-thrombin receptors (up to 2 micrograms/ml) do not stimulate either the early or late influx of 86Rb+, indicating that DIP-alpha-thrombin binding alone is not sufficient to stimulate ion fluxes. High concentrations of either gamma-thrombin or nitro-alpha-thrombin, however, stimulate both early and late 86RB+ uptake but do not initiate DNA synthesis. These results demonstrate that events leading to both the early and late stimulation of 86Rb+ influx by themselves are not sufficient to initiate cell proliferation. Thus, initiation may require a combination of events that can be independently regulated by different transmembrane signals.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Stiernberg J,Carney DH,Fenton JW 2nd,LaBelle EFdoi
10.1002/jcp.1041200305subject
Has Abstractpub_date
1984-09-01 00:00:00pages
289-95issue
3eissn
0021-9541issn
1097-4652journal_volume
120pub_type
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