Lung infections represent a significant burden of disease worldwide and are a common cause of acute lung injury. The pulmonary immune response during bacterial pneumonia is a tightly regulated process that eliminates bacteria while preventing host tissue damage due to excessive inflammation. To orchestrate this delicate balance, host inflammatory cytokine production must be dynamically regulated by both transcriptional and post-transcriptional mechanisms of gene expression. MicroRNA (miRNA) is emerging as an important class of post-transcriptional regulators of multiple cellular processes including inflammation. Recent studies utilizing deep-sequencing of small RNAs have revealed a tremendous amount of sequence diversity of miRNA, however, the functional significance of these sequence variations is unknown. One enzyme known to contribute to miRNA diversity is Zcchc11, a uridyltransferase enzyme that adds uridines to the ends of specific miRNAs. In addition to miRNA editing, our preliminary data show that Zcchc11 regulates cytokine expression, thus suggesting that Zcchc11- mediated miRNA sequence modifications could play a significant role in the post- transcriptional control of cytokine production. We will pursue 3 aims to test the central hypothesis that Zcchc11 uridylates mature miRNAs during pneumonia to regulate cytokine expression and lung inflammation. 1) Test the hypothesis that cytokine- targeting miRNAs are uridylated by Zcchc11 during inflammatory conditions. 2) Test whether sequence elements within uridylated miRNAs and target mRNAs are required for Zcchc11-dependent cytokine expression. 3) Test the hypothesis that Zcchc11- regulated cytokines are essential determinants of the host defense and lung injury during pneumonia. The knowledge obtained from the studies performed in this proposal will be of biological significance for identifying novel molecular mechanisms of gene regulation, miRNA uridylation by Zcchc11, to alleviate the silencing of target mRNAs. Insights obtained from these studies may also be medically significant in that a better understanding of how miRNA editing impacts the host response during pneumonia may lead to new avenues for diagnosis and prevention.

Public Health Relevance

Pneumonia is a major public health problem worldwide that urgently needs to be addressed. Our research is focused on understanding how the strength of the host immune response to pneumonia is balanced to eliminate bacteria while avoiding excessive lung damage. These results of these studies may help in the rational design of pharmacologic therapeutics that target novel mechanisms involved in regulating the immune response during infection.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL104053-03
Application #
8267669
Study Section
Special Emphasis Panel (ZRG1-CVRS-J (03))
Program Officer
Eu, Jerry Pc
Project Start
2010-07-12
Project End
2015-05-31
Budget Start
2012-06-01
Budget End
2013-05-31
Support Year
3
Fiscal Year
2012
Total Cost
$405,116
Indirect Cost
$157,616
Name
Boston University
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
604483045
City
Boston
State
MA
Country
United States
Zip Code
02118
Smith, N Ms; Wasserman, G A; Coleman, F T et al. (2018) Regionally compartmentalized resident memory T cells mediate naturally acquired protection against pneumococcal pneumonia. Mucosal Immunol 11:220-235
Gutiérrez-Vázquez, Cristina; Enright, Anton J; Rodríguez-Galán, Ana et al. (2017) 3' Uridylation controls mature microRNA turnover during CD4 T-cell activation. RNA 23:882-891
Wasserman, Gregory A; Szymaniak, Aleksander D; Hinds, Anne C et al. (2017) Expression of Piwi protein MIWI2 defines a distinct population of multiciliated cells. J Clin Invest 127:3866-3876
Coleman, Fadie T; Blahna, Matthew T; Kamata, Hirofumi et al. (2017) Capacity of Pneumococci to Activate Macrophage Nuclear Factor ?B: Influence on Necroptosis and Pneumonia Severity. J Infect Dis 216:425-435
Kozlowski, Elyse; Wasserman, Gregory A; Morgan, Marcos et al. (2017) The RNA uridyltransferase Zcchc6 is expressed in macrophages and impacts innate immune responses. PLoS One 12:e0179797
Traber, Katrina E; Symer, Elise M; Allen, Eri et al. (2017) Myeloid-epithelial cross talk coordinates synthesis of the tissue-protective cytokine leukemia inhibitory factor during pneumonia. Am J Physiol Lung Cell Mol Physiol 313:L548-L558
Kamata, Hirofumi; Yamamoto, Kazuko; Wasserman, Gregory A et al. (2016) Epithelial Cell-Derived Secreted and Transmembrane 1a Signals to Activated Neutrophils during Pneumococcal Pneumonia. Am J Respir Cell Mol Biol 55:407-18
Hilliard, Kristie L; Allen, Eri; Traber, Katrina E et al. (2015) The Lung-Liver Axis: A Requirement for Maximal Innate Immunity and Hepatoprotection during Pneumonia. Am J Respir Cell Mol Biol 53:378-90
Traber, Katrina E; Hilliard, Kristie L; Allen, Eri et al. (2015) Induction of STAT3-Dependent CXCL5 Expression and Neutrophil Recruitment by Oncostatin-M during Pneumonia. Am J Respir Cell Mol Biol 53:479-88
Hu, Ruoxi; Pan, Wenchi; Fedulov, Alexey V et al. (2014) MicroRNA-10a controls airway smooth muscle cell proliferation via direct targeting of the PI3 kinase pathway. FASEB J 28:2347-57

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