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Salivary Cortisol and Prefrontal Cortical Thickness in Middle-aged Men: A Twin Study

Institution:
Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA.
Publisher:
Elsevier Science
Publication Date:
Nov-2010
Journal:
Neuroimage
Volume Number:
53
Issue Number:
3
Pages:
1093-102
Citation:
Neuroimage. 2010 Nov 15;53(3):1093-102.
PubMed ID:
20156572
PMCID:
PMC4034538
Keywords:
Heritability, Magnetic resonance imaging (MRI), Hippocampus, HPA axis structure, Genetic correlation
Appears in Collections:
NA-MIC, SLICER
Sponsors:
R01 AG022982/AG/NIA NIH HHS/United States
P41 RR014075/RR/NCRR NIH HHS/United States
R01 AG018386/AG/NIA NIH HHS/United States
R01 AG022381/AG/NIA NIH HHS/United States
R01 NS052585/NS/NINDS NIH HHS/United States
R01 EB006758/EB/NIBIB NIH HHS/United States
U54 EB005149/EB/NIBIB NIH HHS/United States
Generated Citation:
Kremen W.S., O'Brien R.C., Panizzon M.S., Prom-Wormley E., Eaves L.J., Eisen S.A., Eyler L.T., Hauger R.L., Fennema-Notestine C., Fischl B., Grant M.D., Hellhammer D.H., Jak A.J., Jacobson K.C., Jernigan T.L., Lupien S.J., Lyons M.J., Mendoza S.P., Neale M.C., Seidman L.J., Thermenos H.W., Tsuang M.T., Dale A.M., Franz C.E. Salivary Cortisol and Prefrontal Cortical Thickness in Middle-aged Men: A Twin Study. Neuroimage. 2010 Nov 15;53(3):1093-102. PMID: 20156572. PMCID: PMC4034538.
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Although glucocorticoid receptors are highly expressed in the prefrontal cortex, the hippocampus remains the predominant focus in the literature examining relationships between cortisol and brain. We examined phenotypic and genetic associations of cortisol levels with the thickness of prefrontal and anterior cingulate cortex regions, and with hippocampal volume in a sample of 388 middle-aged male twins who were 51-59 years old. Small but significant negative phenotypic associations were found between cortisol levels and the thickness of left dorsolateral (superior frontal gyrus, left rostral middle frontal gyrus) and ventrolateral (pars opercularis, pars triangularis, pars orbitalis) prefrontal regions, and right dorsolateral (superior frontal gyrus) and medial orbital frontal cortex. Most of the associations remained significant after adjusting for general cognitive ability, cardiovascular risk factors, and depression. Bivariate genetic analyses suggested that some of the associations were primarily accounted for by shared genetic influences; that is, some of the genes that tend to result in increased cortisol levels also tend to result in reduced prefrontal cortical thickness. Aging has been associated with reduced efficiency of hypothalamic-pituitary-adrenal function, frontal lobe shrinkage, and increases in health problems, but our present data do not allow us to determine the direction of effects. Moreover, the degree or the direction of the observed associations and the extent of their shared genetic underpinnings may well change as these individuals age. Longitudinal assessments are underway to elucidate the direction of the associations and the genetic underpinnings of longitudinal phenotypes for changes in cortisol and brain morphology.

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