scholarly journals A role for intracellular histamine in collagen-induced platelet aggregation

Blood ◽  
1990 ◽  
Vol 75 (2) ◽  
pp. 407-414 ◽  
Author(s):  
SP Saxena ◽  
A McNicol ◽  
LJ Brandes ◽  
AB Becker ◽  
JM Gerrard
Keyword(s):  
Platelet Aggregation ◽  
Histidine Decarboxylase ◽  
Histamine Receptor ◽  
Cyclooxygenase Inhibitors ◽  
Histamine Synthesis ◽  
Serotonin Secretion ◽  
Histamine Production ◽  
Thromboxane Production ◽  
Induced Aggregation

Abstract We previously demonstrated that newly formed intracellular histamine mediates platelet aggregation in response to phorbol-12-myristate-13- acetate (PMA). We now report further investigations of the role of histamine during physiological activation of platelets by collagen. Platelets stirred with collagen produced histamine; the rise in histamine precedes the onset of aggregation. The dose response for collagen stimulation of histamine synthesis and platelet aggregation is similar. Inhibitors of histidine decarboxylase (HDC) block both aggregation and histamine synthesis in parallel. Histamine production is not dependent on aggregation; both the intracellular histamine receptor antagonist, N,N-diethyl-2-[4-(phenylmethyl)phenoxy]ethanamine- HCl (DPPE), and the cyclooxygenase inhibitors, aspirin and indomethacin, inhibit collagen-induced aggregation but not histamine synthesis. DPPE also inhibits collagen-induced serotonin secretion and thromboxane production. The effects of DPPE and HDC inhibitors are significantly reversed by the addition of histamine (0.1 to 10 mumol/L) to saponin-permeabilized platelets, though histamine alone has no pro- aggregatory effects. The results suggest that newly synthesized intracellular histamine has a role in collagen-induced platelet activation and that it may act to promote the generation of thromboxane and the secretion responses of platelet granules.

scholarly journals A role for intracellular histamine in collagen-induced platelet aggregation

Blood ◽  
1990 ◽  
Vol 75 (2) ◽  
pp. 407-414
Author(s):  
SP Saxena ◽  
A McNicol ◽  
LJ Brandes ◽  
AB Becker ◽  
JM Gerrard
Keyword(s):  
Platelet Aggregation ◽  
Histidine Decarboxylase ◽  
Histamine Receptor ◽  
Cyclooxygenase Inhibitors ◽  
Histamine Synthesis ◽  
Serotonin Secretion ◽  
Histamine Production ◽  
Thromboxane Production ◽  
Induced Aggregation

We previously demonstrated that newly formed intracellular histamine mediates platelet aggregation in response to phorbol-12-myristate-13- acetate (PMA). We now report further investigations of the role of histamine during physiological activation of platelets by collagen. Platelets stirred with collagen produced histamine; the rise in histamine precedes the onset of aggregation. The dose response for collagen stimulation of histamine synthesis and platelet aggregation is similar. Inhibitors of histidine decarboxylase (HDC) block both aggregation and histamine synthesis in parallel. Histamine production is not dependent on aggregation; both the intracellular histamine receptor antagonist, N,N-diethyl-2-[4-(phenylmethyl)phenoxy]ethanamine- HCl (DPPE), and the cyclooxygenase inhibitors, aspirin and indomethacin, inhibit collagen-induced aggregation but not histamine synthesis. DPPE also inhibits collagen-induced serotonin secretion and thromboxane production. The effects of DPPE and HDC inhibitors are significantly reversed by the addition of histamine (0.1 to 10 mumol/L) to saponin-permeabilized platelets, though histamine alone has no pro- aggregatory effects. The results suggest that newly synthesized intracellular histamine has a role in collagen-induced platelet activation and that it may act to promote the generation of thromboxane and the secretion responses of platelet granules.

Biochemical and Ultrastructural Studies Suggest that the Effects of Thapsigargin on Human Platelets Are Mediated by Changes in Intracellular Calcium but not by Intracellular Histamine

1992 ◽  
Vol 68 (06) ◽  
pp. 714-718 ◽  
Author(s):  
Satya P Saxena ◽  
Archibald McNicol ◽  
Allan B Becker ◽  
Lorne J Brandes ◽  
Ole Thastrup ◽  
...  
Keyword(s):  
Platelet Aggregation ◽  
Histidine Decarboxylase ◽  
Cytosolic Calcium ◽  
Histamine Receptor ◽  
Human Platelets ◽  
Ultrastructural Changes ◽  
Free Calcium ◽  
Primary Role ◽  
Ultrastructural Studies ◽  
Induced Aggregation

SummaryThe involvement of intracellular histamine in thapsigargin (Tg)-induced platelet aggregation was studied. Platelet aggregation induced by 0.25 and 0.5 µM Tg was not accompained by a rise in intracellular histamine but a significant (p <0.01) increase in the level of intracellular histamine was observed at 1 µM Tg. Preincubation of platelets with inhibitors of histamine metabolizing enzymes had little effect on intracellular histamine levels in platelets stimulated by 0.5 µM Tg. In addition, the inhibitors of histidine decarboxylase (HDC), α-methyl histidine (α-MH) and α-fluoromethyl histidine (α-FMH) failed to inhibit Tg-induced aggregation. The intracellular histamine receptor antagonist, N,N-diethyl-2-[4-(phenylmethyl)phenoxy] ethanamine. HC1 (DPPE), inhibited Tg-induced aggregation but with IC50 values dependent on the concentration of agonist used. The inhibitory effects of DPPE on Tg-induced aggregation were not reversed by the addition of histamine to saponin-permeabilized platelets suggesting non-histamine mediated effects of DPPE on Tg-induced aggregation. Tg stimulated an increase in the cytosolic free calcium concentration which was unaffected by DPPE indicating that the effects of DPPE are also not due to the inhibition of mobilization of cytosolic calcium. The ultrastructural studies suggest that the major Tg-induced changes (pseudopod formation and granule centralization) are consistent with a primary role for Tg to mobilize calcium; DPPE had very little effect on these ultrastructural changes. The results indicate that the effects of Tg on human platelets are mediated by an increase in cytosolic calcium but not by intracellular histamine.

On The Mechanism Of Heparin-Induced Potentiation Of Platelet Aggregation

1981 ◽  
Author(s):  
M Yamamoto ◽  
K Watanabe ◽  
Y Ando ◽  
H Iri ◽  
N Fujiyama ◽  
...  
Keyword(s):  
Platelet Aggregation ◽  
Platelet Activation ◽  
Coagulation Factors ◽  
Marked Enhancement ◽  
Matrix Bound ◽  
Induced Aggregation ◽  
Aggregation Of Platelets ◽  
Plasma Heparin

It has been suggested that heparin caused potentiation of aggregation induced by ADP or epinephrine. The exact mechanism of heparin-induced platelet activation, however, remained unknown. In this paper, we have investigated the role of anti-thrombin III ( AT ) in heparin-induced platelet activation using purified AT and AT depleted plasma. When ADP or epinephrine was added to citrated PRP one minute after addition of heparin ( 1 u/ml, porcine intestinal mucosal heparin, Sigma Co. USA ), marked enhancement of platelet aggregation was observed, compared with the degree of aggregation in the absence of heparin. However, in platelet suspensions prepared in modified Tyrode’s solution, heparin exhibited no potentiating effect on platelet aggregation induced by epinephrine or ADP. Potentiation of epinephrine- or ADP-induced platelet aggregation by heparin was demonstrated when purified AT was added to platelet suspensions at a concentration of 20 μg/ml. AT depleted plasma, which was prepared by immunosorption using matrix-bound antibodies to AT, retained no AT, while determination of α1-antitrypsinα2- macroglobulin and fibrinogen in AT depleted plasma produced values which corresponded to those of the original plasma when dilution factor was taken into account. The activities of coagulation factors were also comparable to those of the original plasma. Heparin exhibited potentiating effect on ADP- or epinephrine-induced aggregation of platelets in original plasma, but no effect in AT depleted plasma. When purified AT was added back to AT depleted plasma at a concentration of 20 μg/ml, potentiation of platelet aggregation by heparin was clearly demonstrated.Our results suggest that effect of heparin on platelet aggregation is also mediated by anti-thrombin III.

Testosterone Potentiation of Ionophore and ADP Induced Platelet Aggregation : Relationship to Arachidonic Acid Metabolism

1981 ◽  
Vol 46 (02) ◽  
pp. 538-542 ◽  
Author(s):  
R Pilo ◽  
D Aharony ◽  
A Raz
Keyword(s):  
Arachidonic Acid ◽  
Platelet Aggregation ◽  
Unsaturated Fatty Acids ◽  
Human Platelet ◽  
Platelet Rich Plasma ◽  
Arachidonic Acid Metabolism ◽  
Ionophore A23187 ◽  
Low Concentrations ◽  
Induced Aggregation

SummaryThe role of arachidonic acid oxygenated products in human platelet aggregation induced by the ionophore A23187 was investigated. The ionophore produced an increased release of both saturated and unsaturated fatty acids and a concomitant increased formation of TxA2 and other arachidonate products. TxA2 (and possibly other cyclo oxygenase products) appears to have a significant role in ionophore-induced aggregation only when low concentrations (<1 μM) of the ionophore are employed.Testosterone added to rat or human platelet-rich plasma (PRP) was shown previously to potentiate platelet aggregation induced by ADP, adrenaline, collagen and arachidonic acid (1, 2). We show that testosterone also potentiates ionophore induced aggregation in washed platelets and in PRP. This potentiation was dose and time dependent and resulted from increased lipolysis and concomitant generation of TxA2 and other prostaglandin products. The testosterone potentiating effect was abolished by preincubation of the platelets with indomethacin.

Collagen-Induced Platelet Aggregation: -Evidence Against the Essential Role of Platelet Adenosine Diphosphate

1979 ◽  
Vol 42 (04) ◽  
pp. 1193-1206 ◽  
Author(s):  
Barbara Nunn
Keyword(s):  
Platelet Aggregation ◽  
Time Course ◽  
Essential Role ◽  
Atp Release ◽  
Adenosine Diphosphate ◽  
Human Platelets ◽  
High Doses ◽  
Induced Aggregation

SummaryThe hypothesis that platelet ADP is responsible for collagen-induced aggregation has been re-examined. It was found that the concentration of ADP obtaining in human PRP at the onset of aggregation was not sufficient to account for that aggregation. Furthermore, the time-course of collagen-induced release in human PRP was the same as that in sheep PRP where ADP does not cause release. These findings are not consistent with claims that ADP alone perpetuates a collagen-initiated release-aggregation-release sequence. The effects of high doses of collagen, which released 4-5 μM ADP, were not inhibited by 500 pM adenosine, a concentration that greatly reduced the effect of 300 μM ADP. Collagen caused aggregation in ADP-refractory PRP and in platelet suspensions unresponsive to 1 mM ADP. Thus human platelets can aggregate in response to collagen under circumstances in which they cannot respond to ADP. Apyrase inhibited aggregation and ATP release in platelet suspensions but not in human PRP. Evidence is presented that the means currently used to examine the role of ADP in aggregation require investigation.

The influence of lysophosphatidic acid on platelet protein phosphorylation

1987 ◽  
Vol 65 (7) ◽  
pp. 642-650 ◽  
Author(s):  
Jon. M. Gerrard ◽  
Laura L. Beattie ◽  
Jan M. McCrae ◽  
Sandra Singhroy
Keyword(s):  
Platelet Aggregation ◽  
Protein Phosphorylation ◽  
Lysophosphatidic Acid ◽  
Calcium Ionophore ◽  
Actin Binding ◽  
Time Points ◽  
Platelet Protein ◽  
Serotonin Secretion ◽  
Mlc Phosphorylation ◽  
Induced Aggregation

Lysophosphatidic acid (LPA) is a lysophospholipid that is produced during thrombin stimulation of platelets, which can promote platelet aggregation. The mechanism of the effect of LPA was explored in normal platelets and in platelets from a patient with a storage pool deficiency (SPD). A comparison with other lysophospholipids showed that only LPA exerted significant effects to cause or potentiate platelet aggregation. Aspirin, an inhibitor of prostaglandin endoperoxide synthetase, had little effect on LPA-induced aggregation, but completely blocked LPA-induced serotonin secretion. LPA also promoted phosphorylation of myosin light chain (MLC), a 47 kilodalton (kDa) protein, and actin-binding protein. Aspirin significantly inhibited the phosphorylation of the 47-kDa and actin-binding proteins at 3–8 min after the addition of LPA, but had no effect on protein phosphorylation within the 1st min and had no significant effect on MLC phosphorylation. In SPD platelets, aspirin partially inhibited both aggregation and phosphorylation of the 47-kDa protein (< 30% inhibition) and MLC (< 40% inhibition) at time points of 1 min or less. The addition of ADP to SPD platelets enhanced the LPA response in platelets either pretreated or not pretreated with aspirin. Studies with SPD platelets indicate that thromboxane and secreted ADP contribute to, but are not necessary for, LPA-induced aggregation and phosphorylation. A23187 (a calcium ionophore) and LPA showed some selectivity to promote MLC as opposed to the 47-kDa protein phosphorylation, particularly at low concentrations of agonists and at earlier time points. The protein phosphorylation changes seen are consistent with a role for MLC phosphorylation in the granule centralization promoted with LPA.

Effect of selective inhibition of the p38 MAP kinase pathway on platelet aggregation

2004 ◽  
Vol 92 (12) ◽  
pp. 1387-1393 ◽  
Author(s):  
Athan Kuliopulos ◽  
Ramon Mohanlal ◽  
Lidija Covic
Keyword(s):  
Platelet Aggregation ◽  
P38 Mapk ◽  
Coronary Intervention ◽  
Selective Inhibition ◽  
P38 Map Kinase ◽  
Significant Inhibition ◽  
Mitogen Activated Protein Kinase ◽  
Thromboxane Production ◽  
Mapk Inhibitor

SummarySystemic inflammation has been shown to be a contributing factor to the instability of atherosclerotic plaques in patients with acute coronary syndromes (ACS). VX-702, a novel p38 mitogen-activated protein kinase (MAPK) inhibitor, is currently under investigation in ACS patients with unstable angina to evaluate its safety and efficacy during percutaneous coronary intervention (PCI).The role of p38 MAPK in platelet aggregation of normal individuals was examined using the selective second generation p38 MAPK inhibitor VX-702. Treatment of platelets with thrombin (activates PAR1 and PAR4 thrombin receptors), SFLLRN (PAR1), AYPGKF (PAR4), collagen (α2β1 and GPVI/FCγIIR receptors) and U46619 (TXA2) resulted in strong activation of p38 MAPK. Activation of the GPIb von Willebrand factor receptor with ristocetin did not stimulate p38 MAPK. Pre-treatment of platelets with 1 μM VX-702 completely inhibited activation of p38 MAPK by thrombin, SFLLRN, AYPGKF, U46619, and collagen. There was no effect of VX-702 on platelet aggregation induced by any of the agonists in the presence or absence of aspirin, heparin or apyrase. It has been postulated that a potential role of p38 MAPK is to activate phospholipase A2 (cPLA2) which catalyses formation of arachidonic acid leading to production of thromboxane. Interestingly, we show contrasting effects of p38 MAPK inhibition as compared to aspirin inhibition on platelet aggregation in response to collagen. Blockade of TXA2 production by aspirin results in significant inhibition of collagen activation. However, VX-702 has no effect on collagen-mediated platelet aggregation, suggesting that blocking p38 MAPK does not effect thromboxane production in human platelets. Therefore, unlike aspirin blockade of thromboxane production in platelets, p38 MAPK inhibitors such as VX-702 do not significantly affect platelet function and would not be expected to contribute to an elevated risk of bleeding side-effects in treated patients.

scholarly journals Hematopoietic progenitors and interleukin-3-dependent cell lines synthesize histamine in response to calcium ionophore

Blood ◽  
1996 ◽  
Vol 87 (8) ◽  
pp. 3161-3169 ◽  
Author(s):  
M Dy ◽  
A Arnould ◽  
FM Lemoine ◽  
F Machavoine ◽  
H Ziltener ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Mrna Expression ◽  
Cell Lines ◽  
Histidine Decarboxylase ◽  
Calcium Ionophore ◽  
Ionophore A23187 ◽  
Hematopoietic Progenitors ◽  
Histamine Synthesis ◽  
Histamine Production ◽  
Dependent Cell

The calcium ionophore A23187 promotes histamine synthesis in murine bone marrow cells by increasing the expression of mRNA encoding histidine decarboxylase (HDC), the histamine-forming enzyme. The cells responsible for this biological activity copurify with hematopoietic progenitors in terms of density, light scatter characteristics, and rhodamine retention, similar to interleukin (IL) 3-induced histamine- producing cells. Yet, the effect of calcium ionophore is not mediated by IL-3. The most purified rhodamine-bright bone marrow subset contains 80% cells that respond to calcium ionophore by increased HDC mRNA expression. This high frequency makes the involvement of one particular progenitor subset in histamine synthesis unlikely. The finding that all IL-3-dependent cell lines tested so far exhibit increased histamine production and HDC mRNA expression in response to calcium influx lends further support to this notion. Cell lines requiring other growth factors or proliferating spontaneously lack this ability. Finally, it should be noted that IL-3-dependent cell lines do not produce histamine in response to their growth factor. It might, therefore, be suggested that the pathway transducing the signal for increased histamine synthesis after IL-3 receptor binding in normal hematopoietic progenitors is modified in these cell lines.

l-Histidine decarboxylase decreases its own transcription through downregulation of ERK activity

2001 ◽  
Vol 281 (4) ◽  
pp. G1081-G1091 ◽  
Author(s):  
Rocchina Colucci ◽  
John V. Fleming ◽  
Ramnik Xavier ◽  
Timothy C. Wang
Keyword(s):  
Histidine Decarboxylase ◽  
Histamine Receptor ◽  
Inhibitory Effect ◽  
Protein Levels ◽  
Amino Terminal ◽  
Histamine Production ◽  
Extracellular Signal ◽  
Dose Dependent Fashion ◽  
Erk Activity ◽  
Dose Dependent

A poorly defined negative feedback loop decreases transcription of thel-histidine decarboxylase (HDC) gene. To help understand this regulation, we have studied the effect of HDC protein expression on HDC gene transcription in transfected AGS-B cells. Expression of the rat HDC protein inhibited HDC promoter activity in a dose-dependent fashion. The region of the HDC promoter mediating this inhibitory effect corresponded to a previously defined gastrin and extracellular signal-related kinase (ERK)-1 response element. Overexpression of the HDC protein reduced nuclear factor binding in this region. Experiments employing specific histamine receptor agonists indicated that the inhibitory effect was not dependent on histamine production, and studies with the HDC inhibitor α-fluoromethylhistidine revealed that inhibition was unrelated to enzyme activity. Instead, an enzymatically inactive region at the amino terminal of the HDC enzyme (residues 1–271) was shown to mediate inhibition. Fluorescent chimeras containing this domain were not targeted to the nucleus, arguing against specific inhibition of the HDC transcription machinery. Instead, we found that overexpression of HDC protein decreased ERK protein levels and ERK activity and that the inhibitory effect of HDC protein could be overcome by overexpression of ERK1. These data suggest a novel feedback-inhibitory role for amino terminal sequences of the HDC protein.

Role of induced histamine in tourniquet shock in mice

1962 ◽  
Vol 203 (3) ◽  
pp. 412-416 ◽  
Author(s):  
Richard W. Schayer
Keyword(s):  
Histidine Decarboxylase ◽  
Fluid Loss ◽  
Local Conditions ◽  
Histamine Synthesis ◽  
Published Evidence ◽  
Tourniquet Shock ◽  
Fundamental Process ◽  
Adrenergic Blocking ◽  
Major Defect

Development of tourniquet shock in mice is accompanied by a progressive activation of histidine decarboxylase, the enzyme which produces histamine, in traumatized tissue and in all nontraumatized tissues tested except spleen. Involvement of absorbed endotoxins appears to be unimportant. In adrenalectomized mice, maintained on saline and hydrocortisone and given adrenergic blocking agents, a mild trauma is lethal; histidine decarboxylase activation occurs. Since the only apparent major defect of these mice is reduced ability to exert catecholamine actions, excessive vasoconstriction seems to be only an ancillary factor in delayed shock, not an essential one. The present findings, along with previously published evidence relating induced histamine synthesis to microcirculatory regulation, suggest that the fundamental process leading to shock after fluid loss is activation of histamine synthesis in or near cells of the capillaries to restore an adequate supply of blood to the tissues. Since induced histamine synthesis is controlled by local conditions, opening of the capillary beds proceeds independently of the over-all circulatory picture; finally, homeostasis can no longer be maintained.

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