A longitudinal analysis of regional brain volumes in macaques exposed to X-irradiation in early gestation.
BACKGROUND
Early gestation represents a period of vulnerability to environmental insult that has been associated with adult psychiatric disease. However, little is known about how prenatal perturbation translates into adult brain dysfunction. Here, we use a longitudinal study design to examine the effects of disruption of early gestational neurogenesis on brain volume in the non-human primate.


RESULTS
Five Rhesus macaques were exposed to x-irradiation in early gestation (E30-E41), and four control monkeys were sham-irradiated at comparable ages. Whole brain magnetic resonance imaging was performed at 6 months, 12 months, and 3 and 5 years of age. Volumes of whole cerebrum, cortical gray matter, caudate, putamen, and thalamus were estimated using semi-automated segmentation methods and high dimensional brain mapping. Volume reductions spanning all ages were observed in irradiated monkeys in the putamen (15-24%, p = 0.01) and in cortical gray matter (6-15%, p = 0.01). Upon covarying for whole cerebral volume, group differences were reduced to trend levels (putamen: p = 0.07; cortical gray matter: p = 0.08). No group-by-age effects were significant.


CONCLUSIONS
Due to the small number of observations, the conclusions drawn from this study must be viewed as tentative. Early gestational irradiation may result in non-uniform reduction of gray matter, mainly affecting the putamen and cerebral cortex. This may be relevant to understanding how early prenatal environmental insult could lead to brain morphological differences in neurodevelopmental diseases.
Department of Pathology and Anatomical Sciences, University of Missouri School of Medicine, Columbia, Missouri, United States of America. aldridgek@missouri.edu
Kristina
K
Aldridge
Lei
L
Wang
Michael P
MP
Harms
Amanda J
AJ
Moffitt
Kimberly K
KK
Cole
John G
JG
Csernansky
Lynn D
LD
Selemon
D000818:Animals; D001835:Body Weight / Q000528:radiation effects; D001921:Brain / Q000033:anatomy & histology / Q000196:embryology / Q000502:physiology* / Q000528:radiation effects; D001931:Brain Mapping / Q000379:methods; D005260:Female; D008253:Macaca mulatta; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D009474:Neurons / Q000528:radiation effects; D011247:Pregnancy; D011270:Pregnancy, Animal; D011297:Prenatal Exposure Delayed Effects; D011832:Radiation Injuries; D015203:Reproducibility of Results; D013997:Time Factors; D014965:X-Rays