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. 1994 Oct;58(4):275–280.

Activation of murine macrophages and lymphocytes by Ureaplasma diversum.

A Chelmonska-Soyta 1, R B Miller 1, L Ruhnke 1, S Rosendal 1
PMCID: PMC1263712  PMID: 7889459

Abstract

Ureaplasma diversum is a pathogen in the bovine reproductive tract. The objective of the research was to study interactions with macrophages and lymphocytes which might elucidate aspects of pathogenetic mechanisms of this organism. We studied the activation of murine macrophages of C3H/HeN (LPS-responder) and C3H/HeJ (LPS-low-responder) genotype for TNF-alpha, IL-6, IL-1 and nitric oxide production and blastogenic response of C3H/HeJ splenocytes after Ureaplasma diversum stimulation. Live and heat-killed U. diversum induced TNF-alpha, IL-6 and IL-1 in peritoneal macrophage cultures of both C3H/HeN and C3H/HeJ mice in a dose dependent manner. Interferon-gamma modulated the cytokine production, by increasing the production of TNF-alpha, IL-6 and nitric oxide, but IL-1 secretion was only enhanced in C3H/HeJ macrophages stimulated by live ureaplasmas. Supernatant of U. diversum sonicate was mitogenic for murine spleen lymphocytes. The blastogenic response was dose dependent, and stimulation with both U. diversum and Concanavalin A seemed to have an additive effect. These results suggest that U. diversum, similar to other mycoplasmas, activates murine macrophages and lymphoid cells. The studies should be repeated with bovine cells in order to elucidate pathogenetic aspects of inflammation in cattle caused by U. diversum.

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Selected References

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