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Friedrich Beermann

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Related publications (43)

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Conditional deletion of ferritin H in mice induces loss of iron storage and liver damage

Friedrich Beermann, Lukas Kühn

Ferritin plays a central role in iron metabolism by acting both as iron storage and detoxifying protein. We have generated a ferritin H allele with loxP sites and studied the conditional ferritin H deletion in adult mice. Ten days after Mx-Cre induced dele ...

2009

High-dose chemotherapy augments the efficacy of recombinant adenovirus vaccines and improves the therapeutic outcome

Friedrich Beermann

We have investigated the therapeutic potential of a prototypic melanoma vaccine based on recombinant adenovirus expressing human dopachrome tautomerase in the B16F10 murine melanoma model. We found that in the presence of a tumor, the magnitude of T-cell i ...

2009

Regulation of DHICA-mediated antioxidation by dopachrome tautomerase: Implication for skin photoprotection against UVA radiation

Friedrich Beermann

Dopachrome tautomerase (Dct) is a critical enzyme in the melanogenesis pathway that isomerizes the intermediate dopachrome to 5,6-dihydroxyindole-2-carboxylic acid (DHICA) and influences the proportion of DHICA monomer incorporated into the 5,6-dihydroxyin ...

Elsevier2010

ETS-1 and ETS-2 are upregulated in a transgenic mouse model of pigmented ocular neoplasm

Friedrich Beermann

Purpose: Choroidal melanoma is the most common primary malignant ocular tumor in human adults. Relevant mouse models of human uveal melanoma still remain to be developed. We have studied the transgenic mouse strain, Tyrp-1-TAg, to try to gain insight into ...

2008

Differential roles of the pRb and Arf/p53 pathways in murine naevus and melanoma genesis

Friedrich Beermann

Summary We report on a systematic analysis of genotype-specific melanocyte UVR responses in transgenic mouse melanoma models along with tumour penetrance and comparative histopathology. pRb or p53 pathway mutations cooperated with Nras(Q61K) to transform m ...

2010

RBP-Jκ-dependent Notch signaling enhances retinal pigment epithelial cell proliferation in transgenic mice

Freddy Radtke, Friedrich Beermann, Iraz Toprak Aydin

The Notch signaling pathway is an ubiquitous cell-cell interaction mechanism, which is essential in controlling processes like cell proliferation, cell fate decision, differentiation or stem cell maintenance. Recent data have shown that Notch signaling is ...

Nature Publishing Group2011

Reduction of brain metastases in plasminogen activator inhibitor-1 deficient mice with transgenic ocular tumors

Friedrich Beermann

Plasminogen activator inhibitor-1 is known to play a paradoxical positive role in tumor angiogenesis, but its contribution to metastatic spread remains unclear. We studied the impact of PAI-1 deficiency in a transgenic mouse model of ocular tumors originat ...

Oxford University Press2008

A Subpopulation of Smooth Muscle Cells, Derived from Melanocyte-Competent Precursors, Prevents Patent Ductus Arteriosus

Friedrich Beermann

Background: Patent ductus arteriosus is a life-threatening condition frequent in premature newborns but also present in some term infants. Current mouse models of this malformation generally lead to perinatal death, not reproducing the full phenotypic spec ...

Public Library of Science2013

Transgenic mice and their impact on kidney research

Friedrich Beermann

The kidney is a key organ in the maintenance of ion and fluid homeostasis and specific transport systems localized along the nephron guarantee this function. Due to its large functional heterogeneity, experiments on the whole organ level cannot be easily p ...

2009

Conditional gene targeting of the ENaC subunit genes Scnn1b and Scnn1g

Friedrich Beermann

Epithelial sodium channels (ENaC) are members of the degenerin/ENaC superfamily of non-voltage-gated, highly amiloride-sensitive cation channels that are composed of three subunits (alpha-, beta- and gamma- ENaC). Since complete gene inactivation of the be ...

2009

The Glucocorticoid-Induced Leucine Zipper (Gilz/Tsc22d3-2) Gene Locus Plays a Crucial Role in Male Fertility

Jian Wang, Friedrich Beermann, Roman Chrast

The glucocorticoid-induced leucine zipper (Tsc22d3-2) is a widely expressed dexamethasone-induced transcript that has been proposed to be important in immunity, adipogenesis, and renal sodium handling based on in vitro studies. To address its function in v ...

2012

VE-statin/egfl7 expression in endothelial cells is regulated by a distal enhancer and a proximal promoter under the direct control of Erg and GATA-2

Friedrich Beermann

Angiogenesis is the process by which new blood vessels arise from existing ones by the budding out of endothelial cell capillaries from the luminal side of blood vessels. Blood vessel formation is essential for organ development during embryogenesis and is ...

Public Library of Science2010

The Channel-Activating Protease CAP1/Prss8 Is Required for Placental Labyrinth Maturation

Friedrich Beermann, Simona Frateschi

The serine protease CAP1/Prss8 is crucial for skin barrier function, lung alveolar fluid clearance and has been unveiled as diagnostic marker for specific cancer types. Here, we show that a constitutive knockout of CAP1/Prss8 leads to embryonic lethality. ...

Public Library of Science2013

Temporal control of neurogenin3 activity in pancreas progenitors reveals competence windows for the generation of different endocrine cell types

Friedrich Beermann, Anne Grapin-Botton

All pancreatic endocrine cells, producing glucagon, insulin, somatostatin, or PP, differentiate from Pdx1+ progenitors that transiently express Neurogenin3. To understand whether the competence of pancreatic progenitors changes over time, we generated tran ...

Cell Press - Elsevier2007

A MART-1::Cre transgenic line induces recombination in melanocytes and RPE

Friedrich Beermann, Iraz Toprak Aydin

The number of transgenic mouse lines expressing Cre in either type of pigment cells (melanocytes and retinal pigment epithelium, RPE) is limited, and the available lines do not always offer sufficient specificity. In this study, we addressed this issue and ...

2011

Mutation of the BAFF furin cleavage site impairs B-cell homeostasis and antibody responses

Friedrich Beermann

B-cell-activating factor of the TNF family (BAFF)/BLyS contributes to B-cell homeostasis and function in the periphery. BAFF is expressed as a membrane-bound protein or released by proteolytic cleavage, but the functional importance of this processing even ...

Wiley2011

Precise toxigenic ablation of intermediate cells abolishes the "battery" of the cochlear duct

Friedrich Beermann

The extracellular potential of excitable and nonexcitable cells with respect to ground is ∼0 mV. One of the known exceptions in mammals is the cochlear duct, where the potential is ∼80-100 mV, called the endocochlear potential (EP). The EP serves as the "b ...

Society for Neuroscience2013

STAT3 promotes melanoma metastasis by CEBP-induced repression of the MITF pathway

Friedrich Beermann

Metastatic melanoma is hallmarked by its ability of phenotype switching to more slowly proliferating, but highly invasive cells. Here, we tested the impact of signal transducer and activator of transcription 3 (STAT3) on melanoma progression in association ...

SPRINGERNATURE2021

Constitutive gray hair in Mice induced by Melanocyte-specific deletion of c-Myc

Friedrich Beermann, Marzia Armaro

c-Myc is involved in the control of diverse cellular processes and implicated in the maintenance of different tissues including the neural crest. Here we report that c-Myc is particularly important for pigment cell development and homeostasis. Targeting c- ...

2012

Direct presentation of a melanocyte-associated antigen in peripheral lymph nodes induces cytotoxic CD8+ T cells

Friedrich Beermann

Encounter of self-antigens in the periphery by mature T cells induces tolerance in the steady-state. Hence, it is not understood why the same peripheral antigens are also promiscuously expressed in the thymus to mediate central tolerance. Here, we analyzed ...

2008