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Serotonin transporter polymorphism, memory and hippocampal volume in the elderly: association and interaction with cortisol

Molecular Psychiatry volume 12, pages 544–555 (2007)Cite this article

Abstract

The s allele variant of the serotonin transporter gene (5-HTT) has recently been observed to moderate the relationship of stress to depression and anxiety. To date no study has considered interactive effects of 5-HTT genotype, stress and hypothalamic–pituitary–adrenal (HPA) function on cognition in healthy, older adults, which may reflect developmental, functional or neurodegenerative effects of the serotonin transporter polymorphism. We investigated whether 5-HTT genotype interacts with cumulative life stress and HPA-axis measures of waking and diurnal cortisol slope to impact cognition in 154 non-depressed, older adults. Structural images of hippocampal volume were acquired on a subsample of 56 participants. The 5-HTT s allele was associated with both significantly lower delayed recall and higher waking cortisol levels. Presence of the s allele interacted with higher waking cortisol to negatively impact memory. We also observed a significant interaction of higher waking cortisol and the s allele on lower hippocampal volume. Smaller hippocampi and higher cortisol were associated with lower delayed recall only in s allele carriers. No impact or interactions of cumulative life stress with 5-HTT or cortisol were observed. This is the first investigation to identify an association of the 5-HTT s allele with poorer memory function in older adults. The interactive effects of the s allele and waking cortisol levels on reduced hippocampal volume and lower memory suggest that the negative effect of the serotonin polymorphism on memory is mediated by the HPA axis. Further, given the significant association of the s allele with higher waking cortisol in our investigation, future studies may be needed to evaluate the impact of the serotonin transporter polymorphism on any neuropsychiatric or behavioral outcome which is influenced by HPA axis function in older adults.

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Acknowledgements

This work was supported in part by National Institutes of Health grants AG 18784; AG 17824; and MH70886, and the Department of Veteran Affairs, Sierra-Pacific Mental Illness Research, Education, and Clinical Center (MIRECC).

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Authors and Affiliations

  1. Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford University, Stanford, CA, USA

    R O'Hara, C M Schröder, R Mahadevan, A F Schatzberg, S Lindley, H C Kraemer, A Noda, X Lin, H L Gray & J F Hallmayer

  2. Department of Veteran Affairs, Sierra-Pacific Mental Illness Research, Education, and Clinical Center (MIRECC), Palo Alto, CA, USA

    R O'Hara & A Noda

  3. VA Palo Alto Health Care System, Palo Alto, CA, USA

    S Lindley

  4. University of California, San Francisco, CA, USA

    S Fox & M Weiner

  5. Center for Imaging of Neurodegenerative Diseases, Veterans Administration Medical Center, San Francisco, CA, USA

    S Fox & M Weiner

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  1. R O'Hara
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O'Hara, R., Schröder, C., Mahadevan, R. et al. Serotonin transporter polymorphism, memory and hippocampal volume in the elderly: association and interaction with cortisol. Mol Psychiatry 12, 544–555 (2007). https://doi.org/10.1038/sj.mp.4001978

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