Effect of inhibitors of mitogen-activated protein kinase kinase on α1B-adrenoceptor phosphorylation

R. Alcántara-Hernández, J. Adolfo García-Sáinz
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引用次数: 1

Abstract

1 Mitogen-activated protein kinases mediate hormone/neurotransmitter action on proliferation and differentiation and participate in receptor regulation. The effect of inhibitors of mitogen-activated kinase kinase (MEK) on α1B-adrenoceptor phosphorylation state and function was studied using different cell lines. It was observed that at nanomolar concentrations the MEK inhibitors, PD98059 (2′-amino-3′-methoxyflavone) and UO126 [1,4-(diamino-2,3-dicyano/1,4-bis-(2-aminophenylthio)-butadiene], increased α1B-adrenoceptor phosphorylation and diminished the functional response of this receptor to noradrenaline. These agents did not alter the action of lysophosphatidic acid.

2 Staurosporine (IC50 ≈ 0.8 nm) (a general protein kinase inhibitor) and bis-indolyl-maleimide I (IC50 ≈ 200 nm) (a selective protein kinase C inhibitor) inhibited PD98059-induced α1B-adrenoceptor phosphorylation. In contrast, neither wortmannin (phosphoinositide 3-kinase inhibitor) nor genistein (protein tyrosine kinase inhibitor) had any effect. The data suggest the possibility that MEK might exert control on the activity of the enzymes that regulate receptor phosphorylation, such as G-protein-coupled receptor kinases, protein kinase C or serine/threonine protein phosphatases.

3 Coimmunoprecipitation studies showed a constant association of total extracellular signal-regulated kinase 2 (ERK2) with α1B-adrenoceptors. Association of phospho-ERK 1/2 to α1B-adrenoceptors increased not only in response to agonist but also in response to agents that increase α1B-adrenoceptor and ERK1/2 phosphorylation [such as endothelin-1, phorbol 12-myristate-13-acetate (PMA) and epidermal growth factor (EGF)]; not surprisingly, PD98059 decreased this effect.

4 Our data show that blockade of MEK activity results in increased α1B-adrenoceptor phosphorylation, diminished adrenoceptor function and perturbation of receptor–ERK1/2 interaction.

丝裂原活化蛋白激酶激酶抑制剂对α 1b肾上腺素能受体磷酸化的影响
1有丝分裂原活化蛋白激酶介导激素/神经递质对细胞增殖和分化的作用,并参与受体调节。采用不同细胞系研究了丝裂原活化激酶(MEK)抑制剂对α 1b -肾上腺素能受体磷酸化状态和功能的影响。在纳米摩尔浓度下,MEK抑制剂PD98059(2′-氨基-3′-甲氧基黄酮)和UO126[1,4-(二氨基-2,3-二氨基/1,4-双-(2-氨基苯基硫)-丁二烯]增加α 1b -肾上腺素受体磷酸化,降低该受体对去甲肾上腺素的功能反应。这些制剂不改变溶血磷脂酸的作用。2 Staurosporine (IC50≈0.8 nm)(一种普通蛋白激酶抑制剂)和bisindolyl -马来酰亚胺I (IC50≈200 nm)(一种选择性蛋白激酶C抑制剂)抑制pd98059诱导的α 1b -肾上腺素能受体磷酸化。相比之下,wortmannin(磷酸肌苷3-激酶抑制剂)和染料木素(蛋白酪氨酸激酶抑制剂)都没有任何作用。这些数据表明,MEK可能会控制调节受体磷酸化的酶的活性,如g蛋白偶联受体激酶、蛋白激酶C或丝氨酸/苏氨酸蛋白磷酸酶。共免疫沉淀研究显示总胞外信号调节激酶2 (ERK2)与α 1b肾上腺素受体之间存在恒定的关联。磷酸化- ERK1/2与α 1b -肾上腺素受体的关联不仅在激动剂的作用下增加,而且在增加α 1b -肾上腺素受体和ERK1/2磷酸化的药物(如内皮素-1、phorbol 12-肉豆酸-13-乙酸酯(PMA)和表皮生长因子(EGF))作用下也增加;毫不奇怪,PD98059降低了这种影响。我们的数据表明,阻断MEK活性导致α 1b -肾上腺素能受体磷酸化增加,肾上腺素能受体功能减弱,受体- erk1 /2相互作用受到干扰。
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