M. Shamim

Publications16
h-index11
Citations970
Highly Influential Citations18
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1,3-Dialkyl-8-(p-sulfophenyl)xanthines: potent water-soluble antagonists for A1- and A2-adenosine receptors.
A series of 8-(substituted phenyl) derivatives of theophylline and other 1,3-dialkylxanthines were evaluated for potency and selectivity as antagonists at A1- and A2-adenosine receptors in brain… Expand
  • 215
  • 6
3,7-Dimethyl-1-propargylxanthine: a potent and selective in vivo antagonist of adenosine analogs.
3,7-Dimethyl-1-propargylxanthine (DMPX), a caffeine analog that exhibits in vitro selectivity for A2-adenosine receptors, compared to A1-adenosine receptors, has now been investigated with respect to… Expand
  • 132
  • 6
Caffeine and theophylline analogues: correlation of behavioral effects with activity as adenosine receptor antagonists and as phosphodiesterase inhibitors.
The behavioral stimulant effects of xanthines, such as caffeine and theophylline, appear to involve blockade of central adenosine receptors. However, 3-isobutyl-1-methylxanthine (IBMX), a potent… Expand
  • 183
  • 2
Analogues of caffeine and theophylline: effect of structural alterations on affinity at adenosine receptors.
A variety of analogues of caffeine and theophylline in which the 1-,3-, and 7-methyl substituents have been replaced with n-propyl, allyl, propargyl, and isobutyl and, in a few cases, with… Expand
  • 111
  • 2
Analogs of caffeine: antagonists with selectivity for A2 adenosine receptors.
Several analogs of caffeine have been investigated as antagonists at A2 adenosine receptors stimulatory to adenylate cyclase in membranes from rat pheochromocytoma PC12 cells and human platelets and… Expand
  • 88
  • 2
Effects of 8-phenyl and 8-cycloalkyl substituents on the activity of mono-, di-, and trisubstituted alkylxanthines with substitution at the 1-, 3-, and 7-positions.
The effects of 8-phenyl and 8-cycloalkyl substituents on the activity of theophylline, caffeine, 1,3-dipropylxanthine, 1,3-dipropyl-7-methylxanthine, 3-propylxanthine, and 1-propylxanthine at A1… Expand
  • 63
8-Aryl-and 8-cycloalkyl-1,3-dipropylxanthines: further potent and selective antagonists for A1-adenosine receptors.
A series of 1,3-dipropylxanthines were prepared with a variety of substituents at the 8-position. These included 8-aryl and 8-cycloalkyl groups. Polar carboxylate and carboxamide moieties were… Expand
  • 34
Non-xanthine heterocycles: activity as antagonists of A1- and A2-adenosine receptors.
A variety of non-xanthine heterocycles were found to be antagonists of binding of [3H]phenylisopropyladenosine to rat brain A1-adenosine receptors and of activation of adenylate cyclase via… Expand
  • 51
Analogues of 1,3-dipropyl-8-phenylxanthine: enhancement of selectivity at A1-adenosine receptors by aryl substituents.
The effect of a variety of aryl substituents on the potency and selectivity of 19 analogues of 1,3-dipropyl-8-phenylxanthine as antagonists at A1- and A2-adenosine receptors in brain tissue was… Expand
  • 28
A1- and A2-selective adenosine antagonists: in vivo characterization of cardiovascular effects.
Caffeine, a nonselective adenosine receptor antagonist, 7-methyl-1,3-dipropylxanthine, a purported A2 selective antagonist and a 1,3-dipropyl-8-phenylxanthine amine congener (XAC), an A1 selective… Expand
  • 37
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