Comparative Biophysical Studies of Sartan Class Drug Molecules Losartan and Candesartan (CV-11974) with Membrane Bilayers

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• 作者：Charalambos Fotakis ; Dionysios Christodouleas ; Panagiotis Zoumpoulakis ; Eftichia Kritsi ; Nikolas-Ploutarch Benetis ; Thomas Mavromoustakos ; Heribert Reis ; Argiro Gili ; Manthos G. Papadopoulos ; Maria Zervou
• 刊名：Journal of Physical Chemistry B
• 出版年：2011
• 出版时间：May 19, 2011
• 年：2011
• 卷：115
• 期：19
• 页码：6180-6192
• 全文大小：1157K
• 年卷期：v.115,no.19(May 19, 2011)
• ISSN：1520-5207

文摘

The interactions of the antihypertensive AT₁ antagonists candesartan and losartan with membrane bilayers were studied through the application of DSC, Raman, and solid state ³¹P NMR spectroscopies. ¹H and ¹³C NMR resonances of candesartan were assigned on the basis of 1D and 2D NMR spectroscopy. A ³¹P CP NMR broadline fitting methodology in combination with ab initio computations was implemented and, in conjunction with DSC and Raman results, provided valuable information regarding the perturbation, localization, orientation, and dynamic properties of the drugs in membrane models. In particular, results indicate that losartan anchors in the mesophase region of the lipid bilayers with the tetrazole group oriented toward the polar headgroup, whereas candesartan has less definite localization spanning from water interface toward the mesophase and upper segment of the hydrophobic region. Both sartan molecules decrease the mobilization of the phospholipids alkyl chains. Losartan exerts stronger interactions compared with candesartan, as depicted by the more prominent thermal, structural, and dipolar ¹H鈥?sup>31P changes that are caused in the lipid bilayers. At higher concentrations, candesartan strengthens the polar interactions and induces increased order at the bilayer surface. At the highest concentration used (20 mol %), only losartan induces formation of microdomains attributed to the flexibility of its alkyl chain. These results in correlation to reported data with other AT₁ antagonists strengthen the hypothesis that this class of molecules may approach the active site of the receptor by insertion in the lipid core, followed by lateral diffusion toward the binding site. Further, the similarities and differences of these drugs in their interactions with lipid bilayers establish, at least in part, their pharmacological properties.