Horváth Z, Pállinger E, Horváth G, Jelinek I, Veszely G, Furész J, Falus A, Buzás EI. Extramedullary hematopoiesis is dysregulated in histamine-free histidine decarboxylase knockout (HDC-/-) mice.
Inflamm Res 2009;
59:429-36. [PMID:
19921486 DOI:
10.1007/s00011-009-0114-7]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2009] [Revised: 10/16/2009] [Accepted: 10/23/2009] [Indexed: 10/20/2022] Open
Abstract
OBJECTIVE AND DESIGN
In this study we investigated the role of histamine on the extramedullary hematopoiesis.
METHODS
Male histidine decarboxylase knockout (HDC(-/-)) mice and wild-type mice were used (n = 5/group). Groups of mice received sublethal total-body gamma irradiation at a single dose of 4 Gy. Spleen cells were studied at different time points post-irradiation by flow cytometry, colony forming unit (CFU) assay, and real-time PCR. For statistical analysis Student's t test, ANOVA, and Holm-Sidak post-hoc test were used.
RESULTS
By day 14 after irradiation, spleen cell counts increased almost eightfold in wild-type and not even fourfold in HDC(-/-) mice (P < 0.01). The proliferative capacity and interleukin-3 signaling of stem cells were impaired in HDC(-/-) mice. STAT5 mRNA expression was decreased in granulocyte-myeloid colonies by 72.9 +/- 8.6% (P < 0.001), compared to the wild-type.
CONCLUSIONS
The absence of histamine adversely affects splenic hematopoiesis via direct and indirect mechanisms.
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