@article{HampfScherfClavelWeissetal.2023,
  author    = {Hampf, Chantal and Scherf-Clavel, Maike and Weiß, Carolin and Kl{\"u}pfel, Catherina and Stonawski, Saskia and Hommers, Leif and Lichter, Katharina and Erhardt-Lehmann, Angelika and Unterecker, Stefan and Domschke, Katharina and Kittel-Schneider, Sarah and Menke, Andreas and Deckert, J{\"u}rgen and Weber, Heike},
  title     = {Effects of anxious depression on antidepressant treatment response},
  series = {International Journal of Molecular Sciences},
  volume    = {24},
  journal   = {International Journal of Molecular Sciences},
  number    = {24},
  issn      = {1422-0067},
  doi       = {10.3390/ijms242417128},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-355801},
  year      = {2023},
  abstract  = {Anxious depression represents a subtype of major depressive disorder and is associated with increased suicidality, severity, chronicity and lower treatment response. Only a few studies have investigated the differences between anxious depressed (aMDD) and non-anxious depressed (naMDD) patients regarding treatment dosage, serum-concentration and drug-specific treatment response. In our naturalistic and prospective study, we investigated whether the effectiveness of therapy including antidepressants (SSRI, SNRI, NaSSA, tricyclics and combinations) in aMDD patients differs significantly from that in naMDD patients. In a sample of 346 patients, we calculated the anxiety somatization factor (ASF) and defined treatment response as a reduction (≥50\%) in the Hamilton Depression Rating Scale (HDRS)-21 score after 7 weeks of pharmacological treatment. We did not observe an association between therapy response and the baseline ASF-scores, or differences in therapy outcomes between aMDD and naMDD patients. However, non-responders had higher ASF-scores, and at week 7 aMDD patients displayed a worse therapy outcome than naMDD patients. In subgroup analyses for different antidepressant drugs, venlafaxine-treated aMDD patients showed a significantly worse outcome at week 7. Future prospective, randomized-controlled studies should address the question of a worse therapy outcome in aMDD patients for different psychopharmaceuticals individually.},
  language  = {en}
}
@article{MrestaniLichterSirenetal.2023,
  author    = {Mrestani, Achmed and Lichter, Katharina and Sir{\´e}n, Anna-Leena and Heckmann, Manfred and Paul, Mila M. and Pauli, Martin},
  title     = {Single-molecule localization microscopy of presynaptic active zones in Drosophila melanogaster after rapid cryofixation},
  series = {International Journal of Molecular Sciences},
  volume    = {24},
  journal   = {International Journal of Molecular Sciences},
  number    = {3},
  issn      = {1422-0067},
  doi       = {10.3390/ijms24032128},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-304904},
  year      = {2023},
  abstract  = {Single-molecule localization microscopy (SMLM) greatly advances structural studies of diverse biological tissues. For example, presynaptic active zone (AZ) nanotopology is resolved in increasing detail. Immunofluorescence imaging of AZ proteins usually relies on epitope preservation using aldehyde-based immunocompetent fixation. Cryofixation techniques, such as high-pressure freezing (HPF) and freeze substitution (FS), are widely used for ultrastructural studies of presynaptic architecture in electron microscopy (EM). HPF/FS demonstrated nearer-to-native preservation of AZ ultrastructure, e.g., by facilitating single filamentous structures. Here, we present a protocol combining the advantages of HPF/FS and direct stochastic optical reconstruction microscopy (dSTORM) to quantify nanotopology of the AZ scaffold protein Bruchpilot (Brp) at neuromuscular junctions (NMJs) of Drosophila melanogaster. Using this standardized model, we tested for preservation of Brp clusters in different FS protocols compared to classical aldehyde fixation. In HPF/FS samples, presynaptic boutons were structurally well preserved with ~22\% smaller Brp clusters that allowed quantification of subcluster topology. In summary, we established a standardized near-to-native preparation and immunohistochemistry protocol for SMLM analyses of AZ protein clusters in a defined model synapse. Our protocol could be adapted to study protein arrangements at single-molecule resolution in other intact tissue preparations.},
  language  = {en}
}
@article{LichterPaulPaulietal.2022,
  author    = {Lichter, Katharina and Paul, Mila Marie and Pauli, Martin and Schoch, Susanne and Kollmannsberger, Philip and Stigloher, Christian and Heckmann, Manfred and Sir{\´e}n, Anna-Leena},
  title     = {Ultrastructural analysis of wild-type and RIM1α knockout active zones in a large cortical synapse},
  series = {Cell Reports},
  volume    = {40},
  journal   = {Cell Reports},
  number    = {12},
  doi       = {10.1016/j.celrep.2022.111382},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-300913},
  year      = {2022},
  abstract  = {Rab3A-interacting molecule (RIM) is crucial for fast Ca\(^{2+}\)-triggered synaptic vesicle (SV) release in presynaptic active zones (AZs). We investigated hippocampal giant mossy fiber bouton (MFB) AZ architecture in 3D using electron tomography of rapid cryo-immobilized acute brain slices in RIM1α\(^{-/-}\) and wild-type mice. In RIM1α\(^{-/-}\), AZs are larger with increased synaptic cleft widths and a 3-fold reduced number of tightly docked SVs (0-2 nm). The distance of tightly docked SVs to the AZ center is increased from 110 to 195 nm, and the width of their electron-dense material between outer SV membrane and AZ membrane is reduced. Furthermore, the SV pool in RIM1α\(^{-/-}\) is more heterogeneous. Thus, RIM1α, besides its role in tight SV docking, is crucial for synaptic architecture and vesicle pool organization in MFBs.},
  language  = {en}
}