Studies show that kidneys produce 2 ,3 -cAMP, 2 ,3 -cAMP is exported and metabolized to 2 -AMP and 3 -AMP, 2 -AMP and 3 -AMP are metabolized to adenosine, 2 ,3 -cAMP inhibits proliferation of preglomerular vascular smooth muscle cells (PGVSMCs) and glomerular mesangial cells (GMCs), and A2B (not A1, A2A, or A3) adenosine receptors mediate part of the antiproliferative effects of 2 ,3 -cAMP. The...

The uroepithelium of the bladder forms an impermeable barrier that is maintained in part by regulated membrane turnover in the outermost umbrella cell layer. Other than bladder filling, few physiological regulators of this process are known. Western blot analysis established that all four adenosine receptors (A1, A2a, A2b, and A3) are expressed in the uroepithelium. A1 receptors were prominentl...

Background: Adenosine plays the role of regulating cell differentiation, proliferation, and apoptosis in various kinds cells through B-cell lymphoma 2 (BCL2) pathway. Objectives: Since anti-apoptotic expression a controlling some lines, this study was designed to investigate whether adenosine analogue, NECA (non-selective receptors agonist), selective A2B receptor antagonist, PSB 603, A2A agoni...

The effect of theta pulse stimulation (TPS) on pentylenetetrazol (PTZ)-induced long-term potentiation of population spikes (PS) was studied in the hippocampal CA1 in vitro. A transient PTZ application produced a long-lasting enhancement of PS amplitude. A 3-min episode of TPS delivered at a higher intensity produced complete reversal of the PTZ potentiation when delivered during the last minute...

Studies show that kidneys produce 2',3'-cAMP, 2',3'-cAMP is exported and metabolized to 2'-AMP and 3'-AMP, 2'-AMP and 3'-AMP are metabolized to adenosine, 2',3'-cAMP inhibits proliferation of preglomerular vascular smooth muscle cells (PGVSMCs) and glomerular mesangial cells (GMCs), and A(2B) (not A(1), A(2A), or A(3)) adenosine receptors mediate part of the antiproliferative effects of 2',3'-c...

The 'omnipresence' of adenosine in all nervous system cells (neurons and glia) together with the intensive release of adenosine following insults, makes adenosine as a sort of 'maestro' of synapses leading to the homeostatic coordination of brain function. Besides direct actions of adenosine on the neurosecretory mechanisms, where adenosine operates to tune neurotransmitter release, receptor-re...

Excitatory glutamatergic synapses in the hippocampal CA1 region of rats are potently inhibited by purines, including adenosine, ATP, and ATP analogs. Adenosine A(1) receptors are known to mediate at least part of the response to adenine nucleotides, either because adenine nucleotides activate A(1) receptors directly, or activate them secondarily upon the nucleotides' conversion to adenosine. In...

BACKGROUND Increased sympathetic activity has been implicated in hypertension. Adenosine has been shown to play a role in blood flow regulation. In the present study, the endogenous adenosine neuromodulatory role, in mesenteric arteries from normotensive and spontaneously hypertensive rats, was investigated. METHODS AND RESULTS The role of endogenous adenosine in sympathetic neurotransmission...

Adenosine is an ubiquitous nucleoside present in all body cells. It is released from metabolically active or stressed cells and subsequently acts as a regulatory molecule through binding to specific A1, A2A, A2B and A3 cell surface receptors. The synthesis of agonists and antagonists to the adenosine receptors and their cloning enabled the exploration of their physiological functions. As nearly...

Adenosine regulates a wide variety of physiological processes including heart rate, vasodilation and inflammation through the activation of specific cell surface adenosine receptors. In addition to these well-established roles of adenosine, recent genetic and pharmacological research has implicated adenosine as an important regulator in bone remodeling. The secretion of adenosine and the presen...