Global transcriptional analysis of following exposure to norepinephrine Free

Abstract

, a component of the porcine respiratory disease complex, colonizes the respiratory tract of swine by binding to the cilia of the bronchial epithelial cells. Mechanisms of pathogenesis are poorly understood for , but previous work has indicated that it responds to the environmental stressors heat shock, iron deprivation and oxidative compounds. For successful infection, must effectively resist host responses to the colonization of the respiratory tract. Among these are changes in hormonal levels in the mucosal secretions. Recent work in the stress responses of other bacteria has included the response to the catecholamine norepinephrine. The idea that can respond to a host hormone, however, is novel and has not previously been demonstrated. To test this, organisms in the early exponential phase of growth were exposed to 100 μM norepinephrine for 4 h, and RNA samples from these cultures were collected and compared to RNA samples from control cultures using two-colour PCR-based microarrays. The response included slowed growth and changes in mRNA transcript levels of 84 genes, 53 of which were upregulated in response to norepinephrine. A larger proportion of the genes upregulated than those downregulated were involved with transcription and translation. The downregulated genes were mostly involved with metabolism, which correlated with the reduction in growth of the mycoplasma. Approximately 51 % of the genes were hypothetical with no known function. Thus, in response to norepinephrine, appears to upregulate protein expression while downregulating general metabolism.

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2008-09-01
2024-03-28
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