βV-tubulin expression is associated with outcome following taxane-based chemotherapy in non-small cell lung cancer

Background:

Tubulin-binding agents (TBAs) are effective in non-small cell lung cancer (NSCLC) treatment. Both βIII- and βV-tubulins are expressed by cancer cells and may lead to resistance against TBAs.

Methods:

Pre-treatment samples from 65 locally advanced or oligometastatic NSCLC patients, who underwent uniform induction chemotherapy with paclitaxel and platinum followed by radiochemotherapy with vinorelbine and platinum were retrospectively analysed by immunohistochemistry. Protein expression of βIII- and βV-tubulin was morphometrically quantified.

Results:

Median pre-treatment H-score for βIII-tubulin was 110 (range: 0–290), and 160 for βV-tubulin (range: 0–290). Low βIII-tubulin expression was associated with improved overall survival (OS) (P=0.0127, hazard ratio (HR): 0.328). An association between high βV-tubulin expression and prolonged progression-free survival (PFS, median 19.2 vs 9.4 months in high vs low expressors; P=0.0315, HR: 1.899) was found. Further, high βV-tubulin expression was associated with objective response (median H-score 172.5 for CR+PR vs 120 for SD+PD patients, P=0.0104) or disease control following induction chemotherapy (170 for CR+PR+SD vs 100 for PD patients, P=0.0081), but not radiochemotherapy.

Conclusion:

Expression of βV-tubulin was associated with treatment response and PFS following paclitaxel-based chemotherapy of locally advanced and oligometastatic NSCLC patients. Prolonged OS was associated with low levels of βIII-tubulin. Prospective evaluation of βIII/βV-tubulin expression in NSCLC is warranted.

The impact of COMT gene polymorphisms on suicidality in treatment resistant major depressive disorder--a European multicenter study

Many association studies have reported associations between the catechol-O-methyltransferase (COMT) gene and psychiatric disorders including major depression (MDD). The COMT gene has further been associated with suicidal behaviour, as well as with treatment response, although with conflicting results. In the present study, we further elucidate the impact of COMT in treatment response in MDD patients with suicide risk and/or a personal history of suicide attempts. Two hundred fifty MDD patients were collected in the context of a European multicentre resistant depression study and treated with antidepressants at adequate doses for at least 4 weeks. Suicidality was assessed using Mini International Neuropsychiatric Interview (MINI) and the Hamilton Rating Scale for Depression (HAM-D). Treatment response was defined as HAM-D ≤ 17 and remission as HAM-D ≤ 7 after 4 weeks of treatment with antidepressants at adequate dose. Genotyping was performed for seven SNPs (rs4680, rs2075507, rs737865, rs6269, rs4633, rs4818 and rs165599) within the COMT gene. With regard to suicide risk and personal history of suicide attempts, neither single marker nor haplotypic association was found with any SNP after multiple testing correction. In non-responders, we found significant single marker and haplotypic association with suicide risk, but not in responders. The same holds true for both remitters and non-remitters, and when testing for association with a personal history of suicide attempts and treatment response phenotypes. In conclusion, we found significant association of COMT SNPs with suicide risk in MDD patients not responding to antidepressant treatment. Larger well-defined cohorts will be required to dissect this further.

P4-07-05: Comparison of PIK3CA Hot Spot Mutations in the Primary Tumor or Metastases with PIK3CA Mutations or PIK3CA Over-Expression in Circulating Tumor Cells of Metastatic Breast Cancer Patients under Sequential Palliative Therapy

Background: Stem cell like tumor cells have been implied as the active source of metastatic spread in primary tumors. To disseminate and metastasize, these cells may undergo phenotypic changes, known as epithelial-mesenchymal transition (EMT). The PI3K/AKT signaling pathway has been identified as one of the most important and most frequently mutated pathways involved in these processes. Assuming that metastasis requires a dissemination of tumor stem cells or tumor cells showing EMT, we studied 174 blood samples of 43 metastatic breast cancer patients under follow-up of palliative chemo-, antibody - or antihormonal therapy for the presence of sternness like circulating tumor cells (slCTCs). Further, we correlated these data with the occurrence of PIK3CA mutations in slCTCs and with the detection of hot spot mutations as well as PTEN loss in primary tumors or metastases.

Materials and Methods: All blood samples underwent immunomagnetic enrichment using the ***AdnaTest ***BreastCancerSelect (AdnaGen AG, Germany). RNA was recovered and reverse transcribed for analysis using the AdnaTest EMT (multiplex RT-PCR for TWIST, AKT2, PI3K), and separately for the stem cell marker ALDH1 applying the AdnaTest TumorStemCell. The identification of EMT markers was considered positive if at least one of the three markers was detected in the sample. The expression of CD34 was analyzed in a subset of samples to exclude potential interference of normal hematopoietic stem cells. The analysis of PCR products was performed by capillary electrophoresis on the Agilent Bioanalyzer 2100. The PIK3CA 3140 G/A mutation in slCTC-derived cDNA was identified by direct sequencing. PIK3CA hot spot mutations in primary tumors or metastases were identified by direct sequencing from microdissected FFPE tumor tissue. PTEN loss (as defined as <10% of cells exhibiting positive staining) was detected by immunohistochemistry.

Results: During follow up, slCTCs were detected in 23/43 (53%) of the patients at least at one time point. ALDH1 was present in 18/43 (42%) patients, and at least one of the EMT markers was detected in 22/43 (51%) of the patients with the over-expression of PI3K (87%), AKT (96%) and TWIST (22%), respectively. Positivity for both, ALDH1 and EMT markers, was found in 15/23 (65%) of the patients. So far, analyzing one sample of each slCTC-positive patient during follow-up of the disease, there seems to be an occurrence of PIK3CA 3140 G/A mutation in slCTCs in about 25% of the patients. Examining the tissue samples, PTEN loss was found in 3/43 (7%) patients, in two of which slCTCs were present. DNA has been extracted from the dissected tumor tissues of all patients and is currently analyzed for PIK3CA mutations. The results will be available for presentation during the SABCS.

Conclusion: This study provides evidence for the presence of therapy-resistant breast cancer stemness like cells in the blood, possibly derived from the tumor or the metastases. Specific PI3K pathway inhibitors, alone or in combination therapy, may provide a therapeutic strategy for eliminating these cells to improve the prognosis of these patients.

Citation Information: Cancer Res 2011;71(24 Suppl):Abstract nr P4-07-05.

Peripheral serotonin uptake is related to neural activation in the cingulate cortex

Introduction

Maximal serotonin transporter (5-HTT) densities have been found in the cingulate cortex, a cortical region that has been critically implicated in emotion processing and the pathophysiology of Major Depressive Disorder. Furthermore, serotonin (5-HT) re-uptake inhibition is the first line strategy in the treatment of depression.

Objectives

Since 5-HTTs are not restricted to neuronal cells, 5-HT uptake velocity (Vmax) can be easily measured on blood platelets subserving as peripheral model of neuronal 5-HTT function and related measures of neural activation.

Aims

To determine whether peripheral 5-HTT uptake velocity is related to neural activation in the cingulate cortex during emotion processing.

Methods

48 healthy subjects underwent an fMRI paradigm comprising emotional (angry/fearful faces and scenes) and neutral stimuli (simple shapes). 5-HT Vmax was determined in platelets. Subjects were genotyped for a common triallelic polymorphism in the promoter region of the 5-HTT gene (5-HTTLPR).

Results

Significant negative correlations between Vmax and BOLD-signal in the anterior and posterior portion of the cingulate cortex have been found. Cluster maxima within both regions were detected in the subgenual anterior cortex (−1.5, 28.5, −3.5, t = −3.77) and the ventral posterior cingulate cortex (−4.5, −49.5,14.5, t = −3.06). Genotype did not impact on this relationship.

Conclusions

Our results indicate a clear dependency between a peripheral marker, platelet 5-HT uptake velocity, and neural activity in portions of the cingulate cortex for the first time.

FC04-06 - Candidate gene association study of suicidality in treatment resistant MDD

Suicidal behaviour runs in families and the existence of genetic vulnerability to suicidality is well-established. Mental disorders, especially depression, are present in more of 90% of suicides. The incidence of treatment emergent suicidal ideation in major depression (MDD) varies from 4% to 20%, depending on the definition of suicidal ideation and sample characteristics.

In the present study, we further elucidated the impact of depression candidate genes in treatment emergent suicidal ideation in MDD. One hundred-seventy MDD patients were collected in the context of a resistant depression study and treated with antidepressants at adequate doses for at least 4 weeks. MDD subjects were genotyped for SNPs within the COMT gene, BDNF, DTNBP1, 5HT1A, 5HT2A, GNB3, GRIK4, PTGS1, PTGS2, CREB, and cytochrome P450 CYP1A2, CYP2C9, CYP2C19 and CYP2D6 gene. Response, remission and treatment resistance, as well as suicidality information derived from Mini International Neuropsychiatric Interview (MINI) and Hamilton Rating Scale for Depression (HAM-D) were recorded.

A quantitative and measure of suicidal behaviour was defined using the Hamilton rating scale (score 0 to 4) and the MINI-item (yes/no) on suicidality in a large cohort of depression cases. In addition, we tested for association with ‘serious suicidal attempts’ corresponding to a HAMD score of 4 (discrete trait analyses). Results of this candidate gene approach in treatment emergent suicidal ideation in MDD will be presented and discussed.

Antidepressant self-poisonings in iran

Introduction

Tricyclic antidepressants (TCAs) are more likely to cause cardiovascular and neurological toxicity than compared to Selective Serotonin Reuptake Inhibitors (SSRIs).

Objectives

In a prospective hospital-based cohort study, we addressed the question of severity and outcome of antidepressant self-poisonings in patients who attended the Loghman-Hakim Hospital Poison Center. The severity was judged by impairment of consciousness, the outcome criteria were the requirement of inpatient treatment and endotracheal intubation as well as mortality. The aim of the study was to find out if TCA intoxications require more therapeutic efforts than SSRI intoxications.

Methods

From 28 March to 20 May 20 2006, all patients presented to the Poison Center were documented using preformatted forms by three trained nurses blinded to any study hypotheses. From 3.578 intoxications, a number of 334 patients with antidepressant or lithium self-poisoning was identified (9.3% of all poisoning cases; 233 females, 101 males; median age 24 years, min 13, max 70).

Results

As compared to SSRI single-substance intoxications (n = 17), TCA single-substance intoxications (n = 73) were associated with (1) a significantly lower level of consciousness (p = 0.005); (2) a significantly higher admission frequency (80.8% vs. 35.3%; p < 0.001) and (3) a higher intubation frequency (13.7% vs. 0%; p = ns). SSRI multiple-substance intoxications were associated with a significantly lower level of consciousness than SSRI single-substance intoxications (p = 0.042), while there was no significant difference between TCA multiple- and single-substance intoxications.

Conclusions

This study suggests that an overdose with SSRIs results in a more favorable clinical outcome than an overdose with TCAs.

JS02-01 - Psychiatric intensive care

Psychiatric disorders per se or treatment resistance can cause life-threatening conditions. More than 25 years have passed since the term “psychiatric intensive care unit” (PICU) was introduced in the United Kingdom. This system is comprised of security units for psychiatric patients with suicidal or violent behaviour, providing a locked environment with more resources regarding personnel and care. The PICU concept at the Department of Psychiatry and Psychotherapy in Vienna, Austria, represents a progress towards optimal care of patients with serious psychiatric illnesses who also have critical somatic illnesses. One third of the patients are transferred from inpatient facilities of medical departments such as internal medicine, emergency medicine, trauma surgery or anesthesiology. Our PICU is dedicated to somatically, critically ill patients who have psychiatric symptoms (e.g., agition, aggression, impulsivity, delusions, catatonia, confusion, reduced consciousness, impaired self-reliance) complicating recovery from their critical, somatic condition. Generally, the dosages for antipsychotics are not higher than those at normal psychiatric wards. Benzodiazepine dosages of about 30mg diazepam equivalents per day are frequently used. In the years 2008 and 2009, 10% of all patients at the Viennese PICU were treated with electroconvulsive therapy. Delirium requires immediate therapy of underlying intracerebral pathologies, extracerebral illnesses or toxic features. Involuntary commitment, physical restraints and urinary catheterization were applied in approximately 50% of the patients, nasogastric tube or central venous catheter in 20%. In every case, intensive care nursing, monitoring of vital functions and specific experience at the interface between psychiatry and somatic medicine are required.

Polypharmacy in psychiatric inpatients: Data from amsp (arzneimittelsicherheit in der psychiatrie), a european pharmacovigilance system

Introduction

Psychotropic polypharmacy is widely used in routine clinical practice although there is still a substantial deficit in established knowledge about combination and augmentation treatments. Polypharmacy is related with a higher risk of adverse drug reactions and incompliance.

Methods

On two reference days per hospital and per year, the following data are recorded for all patients on the wards under AMSP surveillance: all drugs applied on that day with the daily dosage for psychotropic drugs, ICD diagnosis, age, and sex. Data is stored at the study center in Munich. We evaluated data from 2000 (N = 5669) and 2007 (N = 8346).

Results

From 2000 to 2007 inpatient prescriptions including three or more drugs increased significantly from 59.4% to 69.3% (chi2: 144.913; df:1; p < 0.001). Furthermore the percentage of inpatients being prescribed three or more psychotropics increased significantly from 36.5% in 2000 to 47.97% in 2007 (chi2: 180.01; df:1; p < 0.001).

Investigating further, which inpatients, diagnosed according to ICD-10, tend to be treated with more than two psychotropics, we found that this was more common in inpatients, who had an F2., F3. or F9. ICD-10 diagnosis. Especially inpatients with a bipolar disorder (F31.) showed an extremely high rate for psychotropic polypharmacy with three or more psychotropic drugs, with rates of 63,8% in 2000 and 75,2% in 2007.

Conclusion

Polypharmacy is still gaining ground. Our results show that psychotropic agents are commonly used in combination; therefore further studies evaluating assumable positive results of psychotropic combinations are needed.

SS06-01 - Are we getting the most out of combination therapy in the short-term and long-term treatment of mania?

The extensive research into the treatment of bipolar disorder over the last 20 years means that we, as clinicians, have never been in a better position to treat patients with bipolar disorder. Yet despite the availability of modern, evidence-based treatment guidelines, bipolar disorder remains an everyday treatment challenge. Newly diagnosed patients requiring treatment for the first time are not always adequately controlled with single-agent therapy and, similarly, combination therapy is also frequently necessary as maintenance treatment. But with this recognition comes the new challenge of identifying when monotherapy is not enough, which agents to combine, when and for how long? How do we know?

Joined by an internationally respected faculty, Professor Siegfried Kasper chairs a discussion to help answer some of the key questions facing clinicians today:

What response can be anticipated from recommended first-line monotherapies for acute mania?

How do we know whether the response we observe when we prescribe a first-line treatment in a manic patient is adequate?

To what extent can a partial non-response to monotherapy be improved by the addition of a second agent?

What's the benefit of maintaining combination treatment once patients are stable and how long should I continue?

Does adding an antipsychotic to a mood stabiliser increase the risk of adverse events, in the short term or in the long term?

Drawing on latest guideline recommendations, recent clinical research, case studies and their extensive clinical experience, the panel will debate these interesting questions and shed light on how we can optimize both acute and maintenance treatment in this patient group.

Although the design of maintenance studies in bipolar disorder has significantly evolved in recent years, individual study designs continue to differ in important ways, with important implications. What may appear to be small differences between study designs, such as the type of most recent episode experienced by the patients or the stabilisation criteria used in the trial, can have big implications for study outcome. It is thus becoming increasingly important to be able to evaluate the results of trials within the context of the design and determine what they mean for treatment practice. Our panel will therefore also discuss the extent to which the design of bipolar maintenance studies can influence the results achieved and share their views on what this means for treatment now, and in the future.

Are we, and more importantly our patients, getting the most out of combination therapy for bipolar mania? Come and debate the issues with the panel, share your views and see what can be achieved.

Depression

Depression is one of the thoroughly evaluated diseases in psychiatry with regard to diagnosis as well as treatment variables. Like in other medical conditions, early treatment should be aimed and watchful waiting which is for instance also not done in the treatment of high blood pressure or diabetes, has not been proven to be a sophisticated approach based on neurobiological considerations. Like in other diseases, it is apparent that days of untreated depression may result in brain damage like reduced volume size of the hypocampus. The course of illness of depression shows that life events are less important in later stages of the illness than in earlier. The introduction of the group of selective serotonin reuptake inhibitors (SSRI) marked a revolution in the treatment of depression, since it was possible to treat patient for the first time effectively with a more minor side effect profile with this approach. Substantially more patients could be reached and the association with this phenomenon and the reduction of the suicide rates in different countries like Sweden, Austria and Hungary has been discussed. Dual reuptake inhibitors effecting both the serotonergic as well as the noradrenergic pathways and the dopaminergic noradrenergic medication bupropion have been introduced in the filed with specific angles of treatment goals like pain or somatic symptoms. With the introduction of agomelatine, a unique mechanism of action with the combination of melatonergic agonistic as well as serotonergic antagonistic activities has been achieved. With this approach a more potent influence on the circadian rhythm has been shown compared to other, previously used antidepressant properties. Deep brain stimulation and vagus nerve stimulation for treatment refractory depressed patients yield promising results. More thorough characterisation of the underlying pathophysiology of depression including brain imaging results as well as molecular biological variables will yield further inside of the understanding and treatment of depression.

Biological alterations during remission of major depressive disorder

Introduction

The natural course of Major Depressive Disorder (MDD) encompasses the occurrence of alternating intervals of major depressive episodes and remission. While several abnormalities in neural circuits related to acute MDD have been identified, the neural mechanisms underlying stable remission remain obscure.

Objectives

Acute MDD is characterized by increased amygdala and subgenual anterior cingulate cortex (sACC) activation and decreased connectivity between the amygdala and the sACC. Consequently, we expect those regions to be affected during remission.

Aims

To determine whether active counter-regulatory mechanisms are implicated in the maintenance of full remission once antidepressant treatment has been discontinued.

Methods

Functional and structural magnetic resonance imaging was used to measure brain activation and volume of the amygdala and the sACC. Images were obtained from 38 healthy subjects without any psychiatric life-time diagnosis and 38 gender-matched drug-free remitted MDD patients. Furthermore, correlation analyses were performed with clinical variables.

Results

Patients with rMDD exhibited lower activation in the amygdala and the sACC and increased functional coupling between the amygdala and sACC compared to controls. This connectivity was particularly pronounced in patients characterized by a long cumulated time of depressive episodes. Similarly, structural connectivity results showed increased association between the amygdala and sACC volume in rMDD patients compared to controls.

Conclusions

Remitted MDD is related to neural alterations within a neural circuit encompassing the amygdala and the sACC compared to controls. These findings suggest active counter-regulatory mechanisms likely contributing to the maintenance of remission once treatment has been discontinued.

Serotonin - 1A binding in the subgenual anterior cingulate cortex is associated with regional grey matter volume in striatum and temporal areas

Introduction

The subgenual part of the anterior cingulate cortex (sgACC) has been frequently reported to be structurally and cytoarchitectually changed in major depressive disorder (MDD) and is also a promising target in deep brain stimulation in treatment-resistant MDD. Furthermore, substantial evidence demonstrates a high density of serotonin-1A (5-HT1A) receptors in the sgACC, a key area involved in emotional processing.

Objectives

Here, we investigated the relationship between the 5-HT1A receptor in the sgACC and changes in regional grey matter volume with voxel-based morphometry.

Methods

PET ([carbonyl-11C]WAY-100635) was used to quantify 5-HT1A receptor binding (BPND) together with structural magnetic resonance images from 32 healthy subjects (mean 26.68 ± 5.1 years; 17 women). Regression analysis was performed in SPM8 (p < .001 uncorr.) using sgACC 5-HT1A BPND as regressor, controlling for sex, age and total grey matter volume (GMV).

Results

5-HT1A BPND in the sgACC was positively associated with regional GMV in the medial temporal gyri (T=4.37) and nucleus accumbens bilaterally (T = 4.19). Furthermore, sgACC 5-HT1A binding was negatively correlated with GMV within the inferior temporal gyri (T = 5.22) and putamen bilaterally (T = 5.12).

Conclusions

Our findings demonstrate structural relationships between sgACC 5-HT1A receptor binding and grey matter volume in the ventral striatum as well as in temporal regions, which both exhibit close neuronal connections with the sgACC. Moreover, the GMV of the ventral striatum has been reported to be decreased in patients with MDD. Conclusively, our results underpin the role of serotonergic neuronal transmission in cytoarchitectural processes within regions involved in the modulation of mood.

Meta-analysis on the dissection table

Introduction

Determination of the best evidence involves a systematic, comprehensive review and synthesis of the research literature as performed in high-quality meta-analysis. In a recently published multiple-treatment meta-analysis by Cipriani and collegues (Lancet, 2009) the authors finally concluded to favour sertralin over escitalopram due to lower costs.

Objectives/aims

Based on the example published by Cipriani et al. we tried to highlight possible pitfalls, the clinican with limited time might not be able to spot easily whilst skimming the results of meta-analysis.

Results

Escitalopram had the best efficacy and tolerability profile in the study. Sertraline was recommanded as first choice because of the most favourable balance between benefits, acceptability and acquisition costs. Analyzing study-design, statistical procedures and knowledge such as the early launching of generics of escitalopram lead to a different view of the interpretation by Cipriani and collegues.

Conclusions

We concluded that the findings of Cipriani et al. have limited generalizability due to problematic study design issues including statistical concerns. Despite the fact that meta-analysis might provide best evidence-based information, the findings of the latter should always be interpreted with caution as the quality of them can only be as good as the studies included and the study design implemented.

Efficacy and safety of silexan, a new, orally administered lavender oil preparation, in subthreshold anxiety disorder

A number of studies has been performed recently on the efficacy and tolerability of silexan, a novel preparation from lavender oil for oral use, in the treatment of anxiety disorders and related conditions with particular attention to subthreshold generalized anxiety disorder (GAD). Three randomized, double-blind clinical trials were identified which investigated the efficacy of silexan in subsynromal anxiety disorder (vs. placebo; 10 weeks’ treatment), in GAD (vs. lorazepam; 6 weeks), and in restlessness and agitation (vs. placebo; 10 weeks) according to DSM-IV and ICD-10 criteria. One open-label pilot study assessed the potential of the medicinal product in neurasthenia, posttraumatic stress disorder and somatization disorder (6 weeks). All trials assessed the participants’ anxiety levels using the Hamilton Anxiety Scale (HAMA) or the State Trait Anxiety Inventory (STAI) as well as measures of co-morbidity and clinical global impressions. Across all trials 280 patients were exposed to silexan 80 mg/day, 37 were treated with lorazepam 0.5 mg/day and 192 received placebo. Average within group HAMA total scores at baseline ranged between 24.7 and 27.1 points. Patients treated with silexan showed average HAMA total score decreases by between 10.4 ± 7.1 and 12.0 ± 7.2 points at week 6 and by between 11.8 ± 7.7 and 16.0 ± 8.3 points at week 10. In subthreshold GAD silexan was significantly superior to placebo, with a mean value difference of at least 4 points (lower bound of 95% confidence interval (CI)) after 10 weeks. In GAD silexan and lorazepam showed comparable HAMA total score reductions (90% CI for mean value difference: -2.3; 2.8 points). The decrease of anxiety levels was accompanied by a reduction of restlessness and co-morbidity, and by improvements in general well-being. The anxiolytic effect of silexan is superior to placebo and comparable to lorazepam in subthreshold and threshold GAD, respectively. The medicinal product also improved associated symptoms like restlessness, disturbed sleep and somatic complaints, and had a beneficial influence on general well-being and quality of life. Silexan may offer interesting perspectives particularly in the treatment of subthreshold GAD.

Are there structural brain changes following 10 days of SSRI administration investigated by voxel-based morphometry?

Introduction

There is evidence that psychiatric diseases are accompanied by structural alterations in the human brain, partly reversible by pharmacological treatments. Several studies including Tost et al. (Nat.Neurosci.2010;13(8):920-2) investigated the effect of psychotropic drugs on neuronal plasticity pointing towards rapid pharmacologically induced brain grey matter variations, apart from already presumed slow structural changes within weeks. Here, we investigated the short-term (days) structural effects of SSRIs.

Objective

To identify structural changes of grey and white matter following 10d of oral administration (citalopram/escitalopram vs. placebo) in 18 healthy subjects investigated by magnetic resonance imaging (MRI) using voxel-based morphometry (VBM).

Methods

Study design: Randomized, cross-over, placebo-controlled, double-blind study.

Subjects: 18 healthy caucasian subjects (6 female 24.8 ± 2.5 years, 12 males 28.9 ± 6.7 years) MRI: 3 MRI scans/subject (3 Tesla scanner)

Treatment: 10d of oral medication intake of either 20 mg citalopram/d, 10 mg escitalopram/d or placebo in alternating order of administration

Data analysis: VBM, as implemented in SPM8.

Statistical analysis: analysis of variance (ANOVA, FWE corrected), post-hoc pair-wise comparisons.

Results

ANOVA (grey matter: F(2,48) = 18.85, p < 0.05; white matter: F(2,48) = 17.79, p < 0.05) did not reveal suprathreshold clusters in grey or white matter.

Conclusion

This VBM-study does not support previous short-time (days) MR findings of pharmacologically-induced structural alterations in the brain, considering the lack of significant changes in grey and white matter volumes following 10d of SSRI administration. This divergence may be caused by dissent pharmacological effects of SSRIs compared to other psychotropic drugs.

Increased functional coupling between basalganglia and cingulate and prefrontal cortex during resting state conditions in remitted major depressive disorder

Introduction

Converging evidence suggests alterations of neural activation in the basal ganglia to represent neural correlates of Major Depressive Disorder (MDD). While a previous study reported increases of functional connectivity in resting state activity between the caudate nuclei and the posterior cingulate cortex in acutely depressed patients, it remains unclear whether this finding persists during full remission once antidepressant treatment has been discontinued.

Objectives

To investigate patterns of functional coupling between the basal ganglia and cortical regions during resting-state conditions.

Aims

To determine whether increases of functional connectivity between caudate nuclei, putamen, and pallidum with cortical regions, in particular the cingulate cortex, pertain during remission of MDD.

Methods

Forty-three remitted depressed (rMDD) patients and thirty-five healthy controls were recruited at Medical University of Vienna, Vienna, Austria, and performed a six minute resting-state fMRI scan. Seed time series were extracted from the preprocessed data using individual masks for the basal ganglia and correlated with all nodes in a surface based analysis using FreeSurfer, AFNI and SUMA. The resulting correlation coefficients were then Fisher-transformed, group results were determined by comparing group mean smoothed z-scores with a two-sample t-test.

Results

Increased resting-state functional connectivity was revealed between basal ganglia and cingulate as well as prefrontal cortex in the rMDD group compared to healthy controls.

Conclusions

Our preliminary results revealed increased functional coupling between the basal ganglia and wide parts of the cingulate and prefrontal cortex to possibly represent a specific neural pattern during remission of MDD.