Publications by authors named "Kristin Jakobshagen"

Background: Hypobaric hypoxia has been reported to cause endothelial cell and platelet dysfunction implicated in the formation of microvascular lesions, and in its extremes may contribute to vascular leakage in high altitude pulmonary edema or blood brain barrier disruption leading to cerebral micro-hemorrhage (MH). Platelet function in the development of microvascular lesions remained ill defined, and is still incompletely understood. In this study platelet- and endothelial cell-derived extracellular vesicles (PEV and EEV, respectively) and cell adhesion molecules were characterized in plasma samples of members of a high altitude expedition to delineate the contribution of platelets and endothelial cells to hypobaric hypoxia-induced vascular dysfunction.

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The immunoregulatory cytokine IL-10 suppresses T-cell immunity. The complementary question, whether IL-10 is also involved in limiting the collateral damage of vigorous T cell responses, has not been addressed in detail. Here, we report that the particularly strong virus-specific immune response during acute primary infection with the lymphocytic choriomeningitis virus (LCMV) in mice is significantly further increased in Il10-deficient mice, particularly regarding frequencies and cytotoxic activity of CD8(+) T cells.

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As the tissue macrophages of the CNS, microglia are critically involved in diseases of the CNS. However, it remains unknown what controls their maturation and activation under homeostatic conditions. We observed substantial contributions of the host microbiota to microglia homeostasis, as germ-free (GF) mice displayed global defects in microglia with altered cell proportions and an immature phenotype, leading to impaired innate immune responses.

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Ceramides are crucial for skin barrier function, but little is known about the regulation of epidermal appendages and whether stem cell populations that control their regeneration depend on specific ceramide species. Here we demonstrate that ceramide synthase 4 (CerS4) is highly expressed in the epidermis of adult mice where it is localized in the interfollicular epidermis and defined populations within the pilosebaceous unit. Inactivation of CerS4 in mice resulted in precocious activation of hair follicle bulge stem cells while expanding the Lrig1(+) junctional zone and sebaceous glands.

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Ag presentation to CD4(+) and CD8(+) T cells depends on MHC class II and MHC class I molecules, respectively. One important regulatory factor of this process is the transcriptional regulation of MHC gene expression. It is well established that MHC class II transcription relies on the NLR protein CIITA.

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