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Stroke. Author manuscript; available in PMC 2012 Jul 12.
Published in final edited form as:
PMCID: PMC3395370
NIHMSID: NIHMS297055

Response to Psychosocial Treatment in Post-Stroke Depression is Associated with Serotonin Transporter Polymorphisms

Abstract

Background and Purpose

The Living Well With Stroke (LWWS) study has demonstrated effectiveness of a brief psychosocial treatment in reducing depressive symptoms after stroke. The purpose of this analysis was to determine whether key variables associated with prevalence of post-stroke depression (PSD) also predicted treatment response.

Methods

Response to a brief psychosocial/behavioral intervention for PSD was measured with the Hamilton Rating Scale for Depression (HRSD). ANCOVA models tested for interaction of potential predictor variables with treatment group on percent change in HRSD from pre to post-treatment as outcome.

Results

Initial depression severity, hemispheric location, level of social support, age, gender and antidepressant adherence did not interact with the treatment with respect to percent change in HRSD when considered one at a time. Participants who carried one or two s-alleles at the 5-HTTLPR serotonin transporter (SERT) polymorphism or one or two 9- or 12- repeats of the STin2 VNTR polymorphism had significantly better response to psychosocial treatment than those with no s- alleles or no 9- or 12- repeats.

Conclusions

Opposite to the effects of antidepressant drug treatment with selective serotonin reuptake inhibitors, the LWWS psychotherapy intervention was most effective in 5-HTTLPR s-allele carriers and STin2 VNTR 9- or 12- repeat carriers.

Clinical Trial Registration Information

This study was registered with the clinical trials identifier NCT00194454 at www.clinicaltrials.gov/ct/show/NCT00194454?order_1.

Keywords: behavioral therapy, behavioral genetics, depression, stroke

Introduction

Over 30% of stroke survivors experience post-stroke depression (PSD). There is evidence that factors such as female gender, history of depression, younger age, and serotonin transporter (SERT) genotype are predictive of PSD, but there are no published reports about factors influencing the response to any form of treatment for this condition.1, 2 We therefore queried data from our recent successful randomized controlled trial of a psychosocial treatment adjuvant to antidepressants (Living Well With Stroke, LWWS)3 to determine whether subsets of PSD patients respond better to treatment.

Methods

This analysis was a planned, exploratory aim from LWWS in which 101 clinically depressed patients with ischemic stroke were randomly assigned to a 9 session brief pleasant events, problem-solving intervention delivered by an advanced practice nurse therapist, plus antidepressant (intervention, n=48), or to usual care plus antidepressants (control, n=53). Investigated variables, chosen from those noted in prior literature to be predictive of PSD or predictive of response to pharmacotherapy in primary depression, were: age, gender, stroke severity as measured by the initial NIH Stroke Scale (NIHSS), stroke hemisphere location, baseline Hamilton Rating Scale for Depression (HRSD), depression history from the Diagnostic Interview and Structured Hamilton (DISH),4 level of social support measured by the ENRICHD Social Support Inventory (ESSI),5 antidepressant adherence, measured by a self-report medication log, and the 5-HTTLPR and STin2 VNTR polymorphisms of the serotonin transporter (SERT) genotyped in DNA extracted from blood as previously described.2 SERT polymorphisms were genotyped in only a subset of participants (n=61), because genotyping was done as part of an ancillary study which was initiated after LWWS was already well underway. As a result subjects enrolled earlier in the study were not given the opportunity to participate in genotyping. The 17 item HRSD was used to measure treatment response. Genotypes and outcome assessments were determined masked to treatment group. We examined the interaction of treatment group and each of the predictor variables on percent change in HRSD score using individual analysis of covariance (ANCOVA). Details of the parent study design, participant characteristics and measures are found in previous reports.3, 6

Results

There were no significant main effects or interactions with treatment group for gender, stroke severity, hemispheric location, baseline HRSD, prior history of depression, level of social support or antidepressant adherence (Table 1). We saw a significant main effect for age but no significant interaction with age; younger subjects had better mean percent improvement in HRSD in both intervention and control groups. There was a trend towards better treatment response in subjects with smaller strokes and those who were more adherent to antidepressant drug treatment. Because the SERT polymorphisms showed close to significant main and interaction effects, we further examined their impact on treatment outcome (Table 2). Among patients with the 5-HTTLPR s/s genotype or the STin2 VNTR 9/12 and 12/12 genotypes behavioral treatment had a large effect; there was no evidence of an effect of LWWS among l/l homozygotes (Figure). These results did not change substantially when the analysis was controlled for race as white versus non-white (not shown).

Figure
Interaction of 5 HTTLPR genotype (l/l, s/l, s/s) with treatment response (Percent reduction in Hamilton Depression Rating Scale (HRSD)
Table 1
P values for the main effect of each variable and the interaction of that variable with intervention group.
Table 2
Percent reduction in HRSD score from baseline to end of treatment by genotype

Discussion

5-HTTLPR and STin2 VNTR are functional length polymorphisms of the SERT gene, located in the promoter region (5-HTTLPR) and second intron (STin2 VNTR) where they act as regulators of SERT expression.7 The short (s) variant of 5-HTTLPR and the 9- or 12-repeat alleles of STin2 VNTR have previously been associated with co-morbid depression in medically ill populations. 2, 810 In addition, the s-allele of 5-HTTLPR has been associated with lower remission and response rates and a higher number of medication side effects in depressed patients treated with selective serotonin reuptake inhibitors (SSRIs).11 Our observation that SERT genotype is related to better treatment outcome with psychotherapy, in contrast with response to SSRIs, suggests the possibility of personalizing and tailoring both pharmacologic and psychosocial treatments for PSD. However, our study is limited by its small, ethnically heterogeneous sample, which allowed only for a limited detection of gene x treatment interactions. Our findings relate to reports in the literature showing 5-HTTLPR s-allele carriers to be more likely to view environmental stimuli with a negative bias, have heightened emotional reactivity, and develop negative information processing at an early age.1214 Since the s/s genotype may confer an increased sensitivity to the social environment,15 subjects with this genotype could possibly derive particular benefit from an intervention like ours which aims to supply tools to enhance personal psychological resources.

Acknowledgments

Sources of Funding

This work was funded by National Institutes of Health, National Institute of Nursing R01NR07755.

Footnotes

Conflicts of Interest/Disclosures

None

Contributor Information

Ruth Kohen, Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA.

Kevin C. Cain, Department of Biostatistics and Office for Nursing Research, University of Washington, Seattle, WA.

Ann Buzaitis, Department of Biobehavioral Nursing & Health Systems, University of Washington, Seattle, WA.

Vicki Johnson, Department of Neurology, University of Washington Stroke Center, University of Washington, Seattle, WA.

Kyra J Becker, Department of Neurology and Department of Neurological Surgery, University of Washington, Seattle, WA.

Linda Teri, Department of Psychosocial and Community Health, University of Washington, Seattle, WA.

David L Tirschwell, Department of Neurology, University of Washington, Seattle, WA.

Richard C Veith, Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA.

Pamela H Mitchell, Department of Biobehavioral Nursing & Health Systems, Department of Health Services, University of Washington, Seattle, WA.

References

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