Wnt4 regulates thymic cellularity through the expansion of thymic epithelial cells and early thymic progenitors.

Abstract:

:Thymus atrophy is the most common immunopathology in humans, and its occurrence is hastened by several factors that coalesce in patients receiving chemotherapy and most of all in recipients of hematopoietic cell transplantation. We have shown previously that posthematopoietic cell transplantation thymic function was improved by retroviral overexpression of Wnt4 in donor hematopoietic cells. Here, by using both conventional and conditional null mutant mice, we show that Wnt4 regulates steady-state thymic cellularity by a thymic epithelial cell (TEC)-dependent mechanism. The absence of Wnt4 suppressed fetal and postnatal thymic expansion and resulted in decreased TEC numbers, an alteration of the medullary-to-cortical TEC ratio, and a disproportionate loss of the most immature cKit(hi) thymocyte precursors. Wnt4 also is implicated in the maintenance of adult thymopoiesis, although the impact of its deletion once thymic involution has been initiated is more subtle. Together, our results show that Wnt4 controls thymic size by modulating TEC expansion and the earliest, TEC-dependent steps of thymocyte development both in the fetal and postnatal thymus. Wnt4 and its downstream signaling pathways could thus represent interesting candidates to improve thymic output in subjects with thymic atrophy.

journal_name

Blood

journal_title

Blood

authors

Heinonen KM,Vanegas JR,Brochu S,Shan J,Vainio SJ,Perreault C

doi

10.1182/blood-2011-04-350553

subject

Has Abstract

pub_date

2011-11-10 00:00:00

pages

5163-73

issue

19

eissn

0006-4971

issn

1528-0020

pii

blood-2011-04-350553

journal_volume

118

pub_type

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