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    Sustained T cell development continues in thymic grafts when replenishing hematopoietic progenitor cells are lacking, according to reports by Martins et al. and Peaudecerf et al. The authors show that in the absence of competition from T cell progenitors, thymocytes switch to a mode of self-renewal that is capable of maintaining long-term lymphopoiesis and seeding of the periphery with diverse T cell populations. Thomas Boehm discusses these findings and how they challenge central dogma of thymus biology in a Minireview. Cover art of faucets in the on and off position represents the presence or absence of a flow of competitive precursor replacement to the pool of thymocytes. Artwork by Lewis Long (
    See pages 1397, 1401, and 1409

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ISSN 0022-1007
EISSN 1540-9538
In this Issue


Sant and McMichael discuss new advances in detecting CD4+ T cells at the right time and place during viral infection.

Thomas Boehm discusses recent findings on sustained thymocyte development in the absence of replenishing hematopoietic progenitors.

Brief Definitive Report

New thymus transplant experiments reveal that in the absence of competing bone marrow progenitors, existing thymocytes can self-renew, guaranteeing thymus cellularity and the rapid reconstitution of the peripheral T cell pools.

To be added

Mouse RNase H2 is essential to remove ribonucleotides from the genome to prevent DNA damage.

Chemerin recruits NK cells to suppress melanoma growth.

TLR1/TLR2 complexes are required for induction of IL-6 and IL-23 to generate protective TH17-mediated immunity and IgA production after oral but not systemic Yersinia enterocolitica infection.


Differences between TLR-deficient mouse colonies occur from extended husbandry in isolation that are communicated to offspring by maternal transmission.

Deletion of β-catenin from mouse embryonic endothelium, but not embryonic hematopoietic cells, prevents hematopoietic differentiation; thus Wnt/β-catenin signaling is needed for emergence but not maintenance of HSCs.

A new method is used to isolate neutralizing antibodies recognizing a new epitope on the cell surface–expressed, but not soluble, HIV-1 spike.

CD4+ T cells play a dominant role in control of acute HAV infection in chimpanzees.

After cecal ligation and puncture, mice lacking the phosphatidylserine receptor CD300a on mast cells show more neutrophil recruitment to the peritoneal cavity, improved bacterial clearance, and extended survival.

IL-1α promotes a cascade of cytokine production from epithelial cells culminating in Th2 immunity to house dust mite allergens.

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