blood platelet

Terbogrel is an oral thromboxane A2 receptor antagonist (IC50 is about 10 nM) and thromboxane A2 synthase inhibitor (IC50 is about 10 nM). Terbogrel is an antiplatelet compound that inhibits platelet aggregation and is a potential compound for the prevention of blood clots.

Pentoxifylline (PTX) modulates immunologic activity by stimulating cytokine production. Pentoxifylline is a methylxanthine derivative that inhibits phosphodiesterase and affects blood rheology. It also inhibits platelet aggregation and improves blood flow by increasing erythrocyte and leukocyte flexibility.

Adenosine (D-Adenosine) is a natural product, a ribonucleoside consisting of adenine bound to ribose. Adenosine has vasodilatory, antiarrhythmic and analgesic effects.

Eltrombopag (SB-497115-GR), an orally active thrombopoietin receptor agonist with megakaryopoiesis stimulating activity, binds to and stimulates the platelet thrombopoietin receptor (TPO-R or CD110).

Carbazochrome (Adchnon) is an antihemorrhagic, or hemostatic, agent that will cease blood flow by causing the aggregation and adhesion of platelets in the blood to form a platelet plug, ceasing blood flow from an open wound. It is hoped that this drug can be used in the future for preventing excessive blood flow during surgical operations and the treatment of hemorrhoids, but research on its effectiveness and the severity of possible side effects remains to be fairly inconclusive. Carbazochrome has been investigated for use in the treatment of hemorrhoids in a mixture with troxerutin.

Eltrombopag Olamine (Eltrombopag diethanolamine salt) is an orally active small-molecule, nonpeptide thrombopoietin receptor agonist that stimulates megakaryopoiesis. It binds to and activates the transmembrane domain of the platelet thrombopoietin receptor (TPO-R or CD110), promoting the proliferation and differentiation of megakaryocytic cells and enhancing platelet production.

Vicagrel is an effective, orally active antiplatelet compound that enhances the inhibitory effect of aspirin on platelet aggregation and thrombosis in rodents by irreversibly inhibiting P2Y12 receptors and reducing metabolic inactivation. Viagrel can be used to treat blood clots in coronary artery disease, peripheral vascular disease and cerebrovascular disease.

Prostaglandin E1 (Alprostadil) is the naturally occurring prostaglandin E1 (PGE1) which displays a variety of pharmacologic actions. Prostaglandin E1 is a potent vasodilator agent that increases peripheral blood flow, inhibits platelet aggregation, and induces bronchodilation. Used in the treatment of erectile dysfunction, this agent produces corporal smooth muscle relaxation by binding to PGE receptors, resulting in the activation of adenylate cyclase and the subsequent accumulation of 3'5'-cAMP.

Polydatin (Piceid), the glycoside of Resveratrol, is originally isolated from the Chinese herb Polygonum cuspidatum. The compound can inhibit platelet aggregation and elevate the ratios of LDL-C HDL-C and TC HDL-C. In the myocardial cell, white blood cell, vascular smooth muscle cell, and endothelial cell, Polydatin can inhibit ICAM-1 expression, elevate Ca2+, weaken white blood cell-endothelial cell adhesion, and activate KATP channels.

Aloxistatin (E64d) is an inhibitor of cysteine protease with blood platelet aggregation inhibiting activity. Aloxistatin is an irreversible, membrane-permeable inhibitor of lysosomal and cytosolic cysteine proteases with the ability to inhibit calpain activity in intact platelets.

DG-041 is an antagonist of high-affinity EP3 receptor (IC50s: 4.6 nM and 8.1 nM in the binding and FLIPR assay, respectively). DG-041 inhibits PGE2 facilitation of platelet aggregation and has the blood-brain barrier permeability.

Limaprost (17α,20-dimethyl-δ2-PGE1) is an analog of PGE1 with structural modifications intended to give it a prolonged half-life and greater potency.It is a potent and orally active vasodilator. Limaprost increases blood flow and inhibits platelet aggregation. Limaprost (17α,20-dimethyl-δ2-PGE1) can be used for pain relief, has antianginal effects, and has potential for ischaemic symptoms treatment.

Tandutinib (CT53518) (MLN518, CT53518), an effective FLT3 antagonist (IC50: 0.22 μM), can also inhibit c-Kit and PDGFR, 15-20 fold higher potency for FLT3 versus CSF-1R and >100-fold selectivity for the same target versus FGFR, EGFR, and KDR.

BX 667 is a P2Y12 receptor antagonist. BX 667 blocks ADP-induced platelet aggregation in human, dog and rat blood with IC50 value of 97, 317 and 3000 nM respectively.

MK-287 (L-680573) is a platelet activator (PAF) antagonist that effectively inhibates the binding of [3H]C18-PAF to human platelets, polynucleated white blood cells (PMN), and pulmonary membranes. May be used to treat asthma,

AZD1283 is an effective P2Y12 receptor antagonist (EC50: 3.0 ug kg min, binding IC50: 11 nM). AZD1283 dose-dependently induced increases in blood flow and inhibition of ADP-induced platelet aggregation with antithrombotic ED50 values of 3.0 and 10 μg kg min, respectively. The doses induced the increase in bleeding time at 33 and 100 μg kg min for 3- and 13-fold, respectively. Thus, the therapeutic index (TI) was ≥10 for both compounds.

α-Linolenic acid (ALA) is an essential fatty acid found in leafy green vegetables. ALA, as part of a low saturated fat diet, helps prevent cardiovascular disease. ALA decreases blood pressure, serum cholesterol levels, and platelet aggregation.

Angiotensin II is a hormone that plays an important role in regulating blood pressure. Elevated levels of angiotensin II are implicated in inducing and maintaining hypertension, and also in the development of atherosclerosis. Both of these effects are mediated by the angiotensin II type 1 (AT1) receptor. Losartan is a mammalian AT1 receptor antagonist with a Ki value of 5-20 nM. In humans, losartan effectively controls hypertension while protecting renal function. Nitric oxide (NO) causes vasodilation and also inhibits platelet and neutrophil aggregation in the endothelium. NO-losartan A possesses similar anti-hypertensive effects to losartan, with the addition of the vasodilating effects of NO release.

4-hydroxy Valsartan is a major metabolite of the angiotensin II type 1 (AT1) receptor antagonist valsartan . It reduces platelet aggregation induced by epinephrine and collagen but not ADP in human whole blood.

TRAP-6 peptide is a hexapeptide corresponding to residues 42-47 of protease-activated receptor 1 (PAR1). It acts as an agonist of PAR1, inducing platelet aggregation in human platelet-rich plasma ex vivo (EC50 = 0.8 μM). TRAP-6 (0.3 and 0.6 mg/kg) has a triphasic effect on mean arterial blood pressure (MAP) in anesthetized rats with a short decrease, an increase, and then a longer decrease in MAP following intravenous administration.

Isoprostanes are produced by the non-enzymatic, free radical peroxidation of phospholipid-esterified arachidonic acid. They have been used as biomarkers of oxidative stress, but they also have been found to have potent biological activity. ent-8-iso-15(S)-Prostaglandin F2α (ent-8-iso-15(S)-PGF2α) is a potent vasoconstrictor of porcine retinal and brain microvessels with EC50 values of 15 and 24 nM, respectively. This isoprostane is about ten-fold more potent than 8-iso-PGF2α in a whole blood platelet aggregation inhibition assay.

15(S)-15-methyl Prostaglandin D2 (15(S)-15-methyl PGD2) is a metabolically stable synthetic analog of PGD2. Unlike PGD2, 15(S)-15-methyl PGD2 induces vasoconstriction, increases systemic blood pressure, and exhibits significantly reduced inhibitory activity on ADP-induced platelet aggregation. It also demonstrates strong antifertility activity in hamsters, being 200-fold more potent than PGD2.

8-iso PGE2 is one of several isoprostanes produced from arachidonic acid during lipid peroxidation. It is a potent renal vasoconstrictor in the rat. 8-iso PGE2 inhibits U-46619 or I-BOP-induced platelet aggregation with IC50 values of 0.5 and 5 μM, respectively. When infused into the renal artery of the rat at a concentration of 4 μg/kg/min, 8-iso PGE2 decreases the GFR and renal plasma flow by 80% without affecting blood pressure.

16,16-dimethyl PGD2 is a metabolically stable synthetic analog of PGD2. It enhances ADP-induced human platelet aggregation and increases systemic blood pressure in rats.