A pilot study to determine the relationship of changes in the characteristics of β1- and β2-adrenoreceptors against the background of the use of β2-agonists with clinically significant parameters in patients with cardiovascular pathology

Abstract

Background: Comorbid cardiovascular and bronchoobstructive diseases worsens disease course and prognosis and causes difficulties in therapy. Effectiveness 2-agonists (cornerstone of bronchoobstructive pathology treatment) depends on -adrenoreceptors state. Therefore, a detailed study of the functional state of beta-adrenoreceptors is necessary.
 Aim: to evaluate the relationship of changes in the characteristics of 1- and 2-adrenoreceptors, against the background of the use of 2-agonists in patients with cardiovascular and bronchoobstructive diseases with clinically significant parameters.
 Methods: In the pilot single-center prospective study during 2.5 years 45 patients (15 with cardiovascular and 30 with bronchoobstructive diseases) were included. Anamnestic data and complaints were collected and laboratory and instrumental studies were performed. Modified radioligand analysis on blood T-lymphocytes using radiolabeled Cyanopindolol and unlabeled selective ligands (ICI 118551, CGP 20712) before and after salbutamol and formoterol was performed and the binding activity of 1- and 2-adrenoreceptors was determined.
 Results: The correlation analysis between clinically significant parameters and changes in the specific binding index of 1- and 2-adrenoreceptors confirmed its clinical relevance. In test with beta-agonists in cardiovascular and bronchoobstructive diseases patients, an increase in the specific binding index of 1-adrenoreceptors is associated with clinical, laboratory and instrumental parameters of a favorable course of the disease, and an increase in the specific binding index of 2-adrenoreceptors is associated with negative. In the cardiovascular group without bronchoobstructive diseases with salbutamol an increase in the specific binding index of 1-adrenoreceptors was associated with parameters of unfavorable disease course, while an increase in the specific binding index of 2-adrenoreceptors did not have a clear associative relationship with clinical characteristics.
 Conclusions: The association of changes in the specific binding index of 1- and 2-adrenoreceptors in patients with cardiovascular and bronchoobstructive diseases with clinically significant parameters during acute tests with short- and long-acting 2-agonists was revealed, which in the future may provide an opportunity to identify patients with an unfavorable course of the disease.