Abstract
Besides the regulation of hepatic metabolic pathways in which adrenoceptors are mainly involved, their effect on the second messenger cAMP is thought to be related to the growth and differentiation of neoplastic cells. However, few studies have been done on the status of these structures in the human liver affected by cholangiocarcinoma (CC). Thus, in this study, changes in densities of α1- and β2-adrenoceptors (α1-and β2-ARs) were investigated in membranes of human liver with cholangiocarcinoma, and for comparison, in membranes of non-adjacent non-tumour liver using the potent antagonists [3H]-prazosin and [1I]-iodocyanopindolol (ICYP) respectively. In addition, the activity of membrane-bound phospholipase C (PLC) and adenylate cyclase (AC) was also studied. In CC liver, the density of α1-and β2-ARs was significantly reduced, compared with non-tumour liver tissues (α1-ARs: 23.38±4.69 vs 80.35±10.52, P=0.0002 β2-ARs: 14.27±2.93 vs 33.22±4.32 fmol/mg protein, P=0.03), whereas the ligand affinities (KD) remained unchanged. The β2-selective antagonist ICI 118,551 was about 100 times more potent in inhibiting ICYP binding than the β1-selective antagonist CGP 20712A; thus, more than 98% of the β-ARs were of the β2-subtypes. The AC activity upon stimulants acting on β-AR (isoprenaline), G-protein (GTP, NaF) and AC (forskolin) was decreased in CC liver. Similarly, noradrenaline-stimulated PLC activity was significantly reduced in tumour tissues. In conclusion, in CC liver the α1- and β2-ARs density was down-regulated and the neoplastic invasion blunted AC and PLC activity. These quantitative changes may help to elucidate not fully understood pathogenetic mechanisms of disturbed hepatic metabolic processes, such as hypoglycemia during cancer in human liver.
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Kassahun, W.T., Günl, B., Tannapfel, A. et al. Alpha1-and beta2-adrenoceptors in the human liver with mass-forming intrahepatic cholangiocarcinoma: density and coupling to adenylate cyclase and phospholipase C. Naunyn Schmied Arch Pharmacol 372, 171–181 (2005). https://doi.org/10.1007/s00210-005-0017-2
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DOI: https://doi.org/10.1007/s00210-005-0017-2