Evidence map›Paper›PMID 31949019›Full record

ArticleHaematologica2021

Low-dose Btk inhibitors selectively block platelet activation by CLEC-2.

Phillip L R Nicolson, Sophie H Nock, Joshua Hinds, Lourdes Garcia-Quintanilla, Christopher W Smith, Joana Campos, Alexander Brill, Jeremy A Pike, Abdullah O Khan, Natalie S Poulter and 10 more

Open access · goldAbstract read
In one paragraph

Article in Haematologica, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 40 papers.

0numbers the graph read from it
0cells of the map it votes in
40citing papers in PubMed
6.2field-weighted citation impact, top 3% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

40 citing papers in PubMed, 60 citations in OpenAlex.

  1. Article
  2. Article
  3. Review
  4. Review
  5. Platelet Membrane Receptors and Signalling Pathways.Handbook of experimental pharmacology · 2026
    Review
  6. Article
  7. Review
  8. The role of platelets in sepsis: A review.Biomolecules & biomedicine · 2024
    Review
  9. Article
  10. Article
  11. Review
  12. Article
  13. Article
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  15. Article
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

20 authors at 6 institutions in 3 countries.

Phillip L R NicolsonInstitute of Cardiovascular Sciences, University of Birmingham.
Sophie H NockInstitute for Cardiovascular and Metabolic Research, University of Reading.
Joshua HindsInstitute of Cardiovascular Sciences, University of Birmingham.
Lourdes Garcia-QuintanillaInstitute of Cardiovascular Sciences, University of Birmingham.
Christopher W SmithInstitute of Cardiovascular Sciences, University of Birmingham.
Joana CamposInstitute of Cardiovascular Sciences, University of Birmingham.
Alexander BrillInstitute of Cardiovascular Sciences, University of Birmingham.
Jeremy A PikeUniversities of Birmingham and Nottingham, Midlands.
Abdullah O KhanInstitute of Cardiovascular Sciences, University of Birmingham.
Natalie S PoulterUniversities of Birmingham and Nottingham, Midlands.
Diedre M KavanaghUniversities of Birmingham and Nottingham, Midlands.
Stephanie WatsonInstitute of Cardiovascular Sciences, University of Birmingham.
Callum N WatsonInstitute of Cardiovascular Sciences, University of Birmingham, UK.
Hayley CliffordDepartment of Immunology, Heartlands Hospital, Birmingham.
Aarnoud P HuissoonDepartment of Immunology, Heartlands Hospital, Birmingham.
Alice Y PollittInstitute for Cardiovascular and Metabolic Research, University of Reading, UK.
Johannes A EbleInstitute for Physiological Chemistry and Pathobiochemistry, University of Münster, Germany.
Guy PrattDepartment of Haematology, Queen Elizabeth Hospital, Birmingham, UK.
Steve P WatsonUniversities of Birmingham and Nottingham, Midlands, UK.
Craig E HughesInstitute for Cardiovascular and Metabolic Research, University of Reading, UK.
University of Birmingham · GBHeartlands Hospital · GBUniversity of Reading · GBInstitut des Maladies Métaboliques et Cardiovasculaires · FRQueen Elizabeth Hospital Birmingham · GBUniversity of Münster · DE

Funding

British Heart Foundation CH03/003British Heart Foundation FS/17/20/32738British Heart Foundation FS/19/30/34173British Heart Foundation RG/13/18/30563
6 · The paper itself

Abstract

Inhibitors of the tyrosine kinase Btk have been proposed as novel antiplatelet agents. In this study we show that low concentrations of the Btk inhibitor ibrutinib block CLEC-2-mediated activation and tyrosine phosphorylation including Syk and PLCγ2 in human platelets. Activation is also blocked in patients with X-linked agammaglobulinemia (XLA) caused by a deficiency or absence of Btk. In contrast, the response to GPVI is delayed in the presence of low concentrations of ibrutinib or in patients with XLA, and tyrosine phosphorylation of Syk is preserved. A similar set of results is seen with the second-generation inhibitor, acalabrutinib. The differential effect of Btk inhibition in CLEC-2 relative to GPVI signalling is explained by the positive feedback role involving Btk itself, as well as ADP and thromboxane A2 mediated activation of P2Y12 and TP receptors, respectively. This feedback role is not seen in mouse platelets and, consistent with this, CLEC-2-mediated activation is blocked by high but not by low concentrations of ibrutinib. Nevertheless, thrombosis was absent in 8 out of 13 mice treated with ibrutinib. These results show that Btk inhibitors selectively block activation of human platelets by CLEC-2 relative to GPVI suggesting that they can be used at 'low dose' in patients to target CLEC-2 in thrombo-inflammatory disease.

Indexed as

Platelet ActivationPlatelet Membrane GlycoproteinsAnimalsBlood PlateletsHumansLectins, C-TypeMiceProtein Kinase InhibitorsCLEC-2 protein, mouseLectins, C-TypePlatelet Membrane GlycoproteinsProtein Kinase Inhibitors

Identifiers

PMID31949019
PMCPMC7776357
OpenAlexW3000362980

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.