Our aim is to gain a better understanding of the structural features necessary for agonist and antagonist activity at alpha-adrenoceptros. The proposed work is centered around the use of imidazoline derivatives as molecules to probe the stereochemical requirement for alpha-adrenoceptors. Recently, alpha-adrenoceptors have been subclassified alpha 1 and alpha 2, and little data is available which attempts to characterize and to optimize the interaction of imidazoline drugs with the different alpha-adrenoceptors.
Our specific aims are (1) to design, synthesize, isolate and characterize a series of imidazoline analogs, (2) in those instances where appropriate, to separate geometrical isomers and resolve optical isomers for their respective biological studies, (3) to carry out pharmacological studies on the imidazoline derivatives on selected tissues in vitro, and in vivo to quantitative significant activity on the alpha-adrenoceptor subtypes, (4) to examine the imidazoline optical isomer analogs on alpha-adrenoceptors to see what the relationship is to the classical Easson-Stedman Hypothesis for phenethanolamines, (5) to examine the effects of cross desensitization and of selected group reagents in an attempt to differentiate between the action of imidazoline and phenethanolamine derivatives at alpha-adrenoceptors, (6) to initiate studies to evaluate the action of imidazoline analogs on thymidine incorporation into primary hepatocyte cultures that contain alpha 1-adrenoceptors which regulate cell growth, and (7) to determine for these molecules possessing significant alpha-adrenoceptor activities a profile of pharmacological activity including beta-adrenoceptor (beta 1 and beta 2) and histamine (H-1 and H-2) receptors. The studies should provide new insights into what effects substitutions have on known imidazoline agonist and antagonist and provide new findings as to the stereochemical requirements for alpha 1 and alpha 2-adrenoceptors. These drugs will enhance our understanding of the structural requirements for the subtypes of adrenoceptors and provide a more selective emans of treating nasal congestion, depresion, liver cell degeneration or proliferation, hypertension, hypotension and cardiovascular disorders.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM029358-08
Application #
3276936
Study Section
Bio-Organic and Natural Products Chemistry Study Section (BNP)
Project Start
1983-04-01
Project End
1990-07-31
Budget Start
1987-08-01
Budget End
1988-07-31
Support Year
8
Fiscal Year
1987
Total Cost
Indirect Cost
Name
Ohio State University
Department
Type
Schools of Pharmacy
DUNS #
098987217
City
Columbus
State
OH
Country
United States
Zip Code
43210
Bavadekar, Supriya A; Hong, Seoung-Soo; Lee, Sang-Ii et al. (2008) Bioisosteric phentolamine analogs as selective human alpha(2)- versus alpha(1)-adrenoceptor ligands. Eur J Pharmacol 590:53-60
Bavadekar, Supriya A; Ma, Guoyi; Mustafa, Suni M et al. (2006) Tethered yohimbine analogs as selective human alpha2C-adrenergic receptor ligands. J Pharmacol Exp Ther 319:739-48
Salazar-Bookaman, M M; Miller, D D; Patil, P N (2006) Antagonism by imidazoline-type drugs of muscarinic and other receptors in the guinea-pig ileum. Auton Autacoid Pharmacol 26:267-73
Lalchandani, Shilpa G; Lei, Longping; Zheng, Weiping et al. (2002) Yohimbine dimers exhibiting selectivity for the human alpha 2C-adrenoceptor subtype. J Pharmacol Exp Ther 303:979-84
Zheng, W; Lei, L; Lalchandani, S et al. (2000) Yohimbine dimers exhibiting binding selectivities for human alpha2a- versus alpha2b-adrenergic receptors. Bioorg Med Chem Lett 10:627-30
Lei, L; Vaghy, P L; Slavica, M et al. (1998) Activation of L-type calcium channel by tolazoline derivatives: role of isothiocyanate moiety. J Cardiovasc Pharmacol 31:721-33
Boronat, M A; Olmos, G; Miller, D D et al. (1998) Isothiocyanatobenzyl imidazoline is an alkylating agent for I2-imidazoline binding sites in rat and rabbit tissues. Naunyn Schmiedebergs Arch Pharmacol 357:351-5
Zhang, X; De Los Angeles, J E; He, M Y et al. (1997) Medetomidine analogs as alpha 2-adrenergic ligands. 3. Synthesis and biological evaluation of a new series of medetomidine analogs and their potential binding interactions with alpha 2-adrenoceptors involving a ""methyl pocket"". J Med Chem 40:3014-24
Ishikawa, H; Miller, D D; Patil, P N (1996) Comparison of post-junctional alpha-adrenoceptors in iris dilator muscle of humans, and albino and pigmented rabbits. Naunyn Schmiedebergs Arch Pharmacol 354:765-72
Patil, P N; Eraundorfer, P; Dutta, P K (1996) Stereoselective modification of circular dichroism spectra of rat lung beta-adrenoceptor protein preparation by enantiomers of epinephrine. Chirality 8:463-5

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