Abstract
A single exposure to a wide range of concentrations (10−13−10−5 mol/L) of the powerful, complete tumour promoter 12-O-tetradecanoylphorbol-13-acetate (TPA) stimulated 4-day-old primary neonatal rat hepatocytes to synthesize new DNA and to divide within 24 hours independently on the actual (either high [1.8 mmol/L] or low [0.01 mmol/L]) concentration of calcium (Ca2+) in the surrounding HiWoBa2000 synthetic growth medium. Conversely, the exposure to the same range of doses of sapintoxin A (SAP A; a fluorescent phorbol ester activating the Ca2+/phospholipid-dependent protein kinase [PK-C]) without acting by itself either as a complete or as a second-stage tumour promoter) enhanced the proliferative activity of primary hepatocytes only on condition that a high level of Ca2+ was present in the growth medium. On the other hand, studies on the kinetics of the inhibition of new DNA synthesis showed that the induction of the G0/G1 and G1/S transitions by TPA in hepatocytes incubated in the Ca2+-devoid HiWoBa20000 medium still required cellular Ca2+-, CaM-, and PK-C-dependent metabolic events. Hence, the diverse conditioning of the mitogenic activity of tumour promoting and non-promoting phorbol esters by the level of extracellular Ca2+ suggests as a quite likely event the involvement in the process of differently Ca2+-dependent isoenzymes of their receptor PK-C.
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Abbreviations
- Ca2+ :
-
calcium
- CaM:
-
calmodulin
- CsA:
-
cyclosporin A
- H-7:
-
1-(5-isoquinolinylsulfonyl)-2-methyl-piperazine
- La3+ :
-
lanthanum
- PK-C:
-
(Ca2+/phospholipid-dependent)protein kinase C
- R-24571:
-
calmidazolium
- SAP A:
-
sapintoxin A
- TFP:
-
trifluoperazine
- TPA:
-
12-O-tetradecanoylphorbol- 13-acetate
- TLCK:
-
N-α-p-tosyl-L-lysine chloromethyl ketone
- TMB-8:
-
3,4,5-trimethoxybenzoic acid 8-(diethylamino) octyl ester
- W-13:
-
N-(4-aminobutyl)- 5- chloro-2-naphthalene sulfonamide.
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Menapace, L., Zuch, C., Romano, M.F., Evans, A.T., Evans, F.J., Armato, U. (1991). The Different Calcium Requirements of the Mitogenic Effects Elicited in Primary Neonatal Rat Hepatocytes by the Diterpene Phorbol Esters 12-O-Tetradecanoylphorbol-13-Acetate and Sapintoxin A. In: Columbano, A., Feo, F., Pascale, R., Pani, P. (eds) Chemical Carcinogenesis 2. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3694-9_23
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