TY  - JOUR
A1  - Rullmann, Michael
A1  - Preusser, Sven
A1  - Poppitz, Sindy
A1  - Heba, Stefanie
A1  - Gousias, Konstantinos
A1  - Hoyer, Jana
A1  - Schütz, Tatjana
A1  - Dietrich, Arne
A1  - Müller, Karsten
A1  - Hankir, Mohammed K.
A1  - Pleger, Burkhard
T1  - Adiposity Related Brain Plasticity Induced by Bariatric Surgery
JF  - Froniers in Human Neuroscience
N2  - Previous magnetic resonance imaging (MRI) studies revealed structural-functional brain reorganization 12 months after gastric-bypass surgery, encompassing cortical and subcortical regions of all brain lobes as well as the cerebellum. Changes in the mean of cluster-wise gray/white matter density (GMD/WMD) were correlated with the individual loss of body mass index (BMI), rendering the BMI a potential marker of widespread surgery-induced brain plasticity. Here, we investigated voxel-by-voxel associations between surgery-induced changes in adiposity, metabolism and inflammation and markers of functional and structural neural plasticity. We re-visited the data of patients who underwent functional and structural MRI, 6 months (n = 27) and 12 months after surgery (n = 22), and computed voxel-wise regression analyses. Only the surgery-induced weight loss was significantly associated with brain plasticity, and this only for GMD changes. After 6 months, weight loss overlapped with altered GMD in the hypothalamus, the brain's homeostatic control site, the lateral orbitofrontal cortex, assumed to host reward and gustatory processes, as well as abdominal representations in somatosensory cortex. After 12 months, weight loss scaled with GMD changes in right cerebellar lobule VII, involved in language-related/cognitive processes, and, by trend, with the striatum, assumed to underpin (food) reward. These findings suggest time-dependent and weight-loss related gray matter plasticity in brain regions involved in the control of eating, sensory processing and cognitive functioning.
KW  - adiposity
KW  - magnetic resonance imaging
KW  - brain plasticity
KW  - bariatric surgery
KW  - gastric-bypass surgery
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-227168
VL  - 13
ER  - 
TY  - JOUR
A1  - Griebsch, Nora-Isabell
A1  - Kern, Johanna
A1  - Hansen, Jonas
A1  - Rullmann, Michael
A1  - Luthardt, Julia
A1  - Helfmeyer, Stephanie
A1  - Dekorsy, Franziska J.
A1  - Soeder, Marvin
A1  - Hankir, Mohammed K.
A1  - Zientek, Franziska
A1  - Becker, Georg-Alexander
A1  - Patt, Marianne
A1  - Meyer, Philipp M.
A1  - Dietrich, Arne
A1  - Blüher, Matthias
A1  - Ding, Yu-Shin
A1  - Hilbert, Anja
A1  - Sabri, Osama
A1  - Hesse, Swen
T1  - Central serotonin/noradrenaline transporter availability and treatment success in patients with obesity
JF  - Brain Sciences
N2  - Serotonin (5-hydroxytryptamine, 5-HT) as well as noradrenaline (NA) are key modulators of various fundamental brain functions including the control of appetite. While manipulations that alter brain serotoninergic signaling clearly affect body weight, studies implicating 5-HT transporters and NA transporters (5-HTT and NAT, respectively) as a main drug treatment target for human obesity have not been conclusive. The aim of this positron emission tomography (PET) study was to investigate how these central transporters are associated with changes of body weight after 6 months of dietary intervention or Roux-en-Y gastric bypass (RYGB) surgery in order to assess whether 5-HTT as well as NAT availability can predict weight loss and consequently treatment success. The study population consisted of two study cohorts using either the 5-HTT-selective radiotracer [\(^{11}\)C]DASB to measure 5-HTT availability or the NAT-selective radiotracer [\(^{11}\)C]MRB to assess NAT availability. Each group included non-obesity healthy participants, patients with severe obesity (body mass index, BMI, >35 kg/m\(^2\)) following a conservative dietary program (diet) and patients undergoing RYGB surgery within a 6-month follow-up. Overall, changes in BMI were not associated with changes of both 5-HTT and NAT availability, while 5-HTT availability in the dorsal raphe nucleus (DRN) prior to intervention was associated with substantial BMI reduction after RYGB surgery and inversely related with modest BMI reduction after diet. Taken together, the data of our study indicate that 5-HTT and NAT are involved in the pathomechanism of obesity and have the potential to serve as predictors of treatment outcomes.
KW  - obesity
KW  - serotonin
KW  - noradrenaline
KW  - serotonin transporter
KW  - noradrenaline transporter
KW  - Roux-en-Y gastric bypass surgery
KW  - body mass index (BMI; kg/m\(^2\))
KW  - radiotracer
KW  - PET
KW  - PET imaging
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-290294
SN  - 2076-3425
VL  - 12
IS  - 11
ER  -