Leishmania-induced repression of selected non-coding RNA genes containing B-box element at their promoters in alternatively polarized M2 macrophages.

Farrow AL, Rana T, Mittal MK, Misra S, Chaudhuri G
Mol Cell Biochem. 2011 350 (1-2): 47-57

PMID: 21165676 · DOI:10.1007/s11010-010-0681-5

Leishmania is a group of parasitic protozoa that infect blood and tissue phagocytes including macrophages. We hypothesize that Leishmania is capable of establishing infection inside the macrophages because (a) they infect a subpopulation of macrophages; and (b) they "renovate" the macrophages before the establishment of infection. We found that only alternatively activated polarized M2 macrophages support Leishmania growth. Exposure of M2 macrophages to Leishmania promastigotes represses several selected RNA polymerase III (PolIII)-transcribed non-coding RNA (ncRNA) genes including those of 7SL RNA, vault RNA, and B2 RNA which have B-box element at their promoters. The B-box-binding transcription factor TFIIIC110 is down-regulated in Leishmania-exposed macrophages. Both the surface protease gp63 and the surface glycolipid LPG are required for the down-regulation of the ncRNAs in the M2 macrophages. We conclude that Leishmania surface gp63 collaborates with LPG to down-regulate TFIIIC110 in M2 macrophages to repress B-box containing ncRNA gene promoters.

MeSH Terms (18)

Animals Base Sequence Cell Polarity Cells, Cultured Down-Regulation Gene Expression Regulation Humans Leishmania Macrophage Activation Macrophages Mice Molecular Sequence Data Promoter Regions, Genetic Regulatory Elements, Transcriptional RNA, Small Cytoplasmic RNA, Untranslated Signal Recognition Particle U937 Cells

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