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Thromb Haemost 2017; 117(11): 2092-2104
DOI: 10.1160/TH17-03-0149
Blood Cells, Inflammation and Infection
Schattauer GmbH Stuttgart

Acute Haemarthrosis in the Haemophilia A Rat Generates a Local and Systemic Proinflammatory Response

Karin M. Lövgren
,
Kristine R. Christensen
,
Wiktor Majewski
,
Olga Østrup
,
Søren Skov
,
Bo Wiinberg
Further Information

Publication History

01 March 2017

07 August 2017

Publication Date:
30 November 2017 (online)

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Abstract

Background Replacement therapy with coagulation factor VIII (FVIII) concurrent with bleeds (on-demand) in haemophilia A (HA) patients has been hypothesized to increase the risk for antidrug antibodies (inhibitors). A danger signal environment, characterized by tissue damage and inflammation at the site of a bleed, is thought to contribute to the anti-FVIII response. The nature of this inflammatory reaction is, however, not fully known, and new insights will be valuable for both managing inhibitors and understanding arthropathy development.

Objective To characterize the inflammatory response, locally and systemically, during the first 24 hours following a joint bleed in the HA rat.

Methods HA rats received a needle-induced knee joint bleed (n = 83) or a sham procedure (n = 41). Blood samples were collected at selected time points from 0 to 24 hours post injury/sham. Synovial fluid, intra-articular knee tissue and popliteal lymph nodes were collected at 24 hours. Cytokine/chemokine concentrations and gene expression were measured.

Results Gene expression analysis revealed a rapid inflammatory response in the injured knees, accompanied by significantly increased levels of specific gene products in the synovial fluid; IL-1β, TNFα, KC/GRO, IL-6, Eotaxin, MCP-1, MCP-3, MIP-1α, MIP-2, RANTES, A2M and AGP. Plasma analysis demonstrated significantly increased systemic levels of KC/GRO and IL-6 in injured rats already after 5 to 6 hours.

Conclusion A rapid proinflammatory response, locally and systemically, characteristic of innate immunity, was demonstrated. Results reveal a more comprehensive inflammatory picture than previously shown, with resemblance to human haemophilic arthropathy, and with unique correlation between gene expression level, synovial concentration and plasma concentration in individual rats.

Keywords

gene expression - haemarthrosis - haemophilia A - inflammation - rat

Addendum

K.M. Lövgren designed and performed the in vivo study and most of the in vitro work, analysed data and prepared the manuscript; K.R. Christensen helped in performing in vivo and in vitro work and revised the manuscript; W. Majewski and O. Østrup performed expression array and following in silico analyses of expression data and revised the manuscript; S. Skov and B. Wiinberg helped in designing the study and revised the manuscript. All authors approved the final version.


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