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Publications [#339363] of Gregory R. Samanez-Larkin

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Journal Articles

  1. Karrer, T; McLaughlin, C; Guaglianone, C; Samanez-Larkin, G (2018). Reduced serotonin receptors and transporters in normal aging adults: a meta-analysis of PET and SPECT imaging studies. [doi]
    (last updated on 2019/02/22)

    Age-related alterations in serotonin (5-HT) function have been hypothesized to underlie a range of physiological, emotional, and cognitive changes in older age. Here, we conducted a quantitative synthesis and comparison of the effects of age on 5-HT receptors and transporters from cross-sectional PET and SPECT imaging studies. Random-effects meta- analyses of 31 studies including 1087 healthy adults yielded large negative age effects in 5- HT-2A receptors, moderate negative age effects in 5-HT transporters, and small negative age effects in 5-HT-1A receptors. Age differences were significantly larger in 5-HT-2A receptors compared to 5-HT-1A receptors. A meta-regression showed that 5-HT target, brain region, tracer kinetic measure, radionuclide, and publication year significantly moderated the age effect. The findings overall identify reduced serotonergic signal transmission in age. The evidence for a relative preservation of 5-HT-1A compared to 5-HT-2A receptors may partially explain differential psychological changes with age, such as why older people use more emotion-focused rather than problem-focused coping strategies.

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