Absence of age-related prefrontal NAA change in adults with autism spectrum disorders

Atypical trajectory of brain growth in autism spectrum disorders (ASDs) has been recognized as a potential etiology of an atypical course of behavioral development. Numerous neuroimaging studies have focused on childhood to investigate atypical age-related change of brain structure and function, bec...

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Veröffentlicht in:Translational psychiatry 2012-10, Vol.2 (10), p.e178-e178
Hauptverfasser: Aoki, Y, Abe, O, Yahata, N, Kuwabara, H, Natsubori, T, Iwashiro, N, Takano, Y, Inoue, H, Kawakubo, Y, Gonoi, W, Sasaki, H, Murakami, M, Katsura, M, Nippashi, Y, Takao, H, Kunimatsu, A, Matsuzaki, H, Tsuchiya, K J, Kato, N, Kasai, K, Yamasue, H
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container_end_page e178
container_issue 10
container_start_page e178
container_title Translational psychiatry
container_volume 2
creator Aoki, Y
Abe, O
Yahata, N
Kuwabara, H
Natsubori, T
Iwashiro, N
Takano, Y
Inoue, H
Kawakubo, Y
Gonoi, W
Sasaki, H
Murakami, M
Katsura, M
Nippashi, Y
Takao, H
Kunimatsu, A
Matsuzaki, H
Tsuchiya, K J
Kato, N
Kasai, K
Yamasue, H
description Atypical trajectory of brain growth in autism spectrum disorders (ASDs) has been recognized as a potential etiology of an atypical course of behavioral development. Numerous neuroimaging studies have focused on childhood to investigate atypical age-related change of brain structure and function, because it is a period of neuron and synapse maturation. Recent studies, however, have shown that the atypical age-related structural change of autistic brain expands beyond childhood and constitutes neural underpinnings for lifelong difficulty to behavioral adaptation. Thus, we examined effects of aging on neurochemical aspects of brain maturation using 3-T proton magnetic resonance spectroscopy ( 1 H-MRS) with single voxel in the medial prefrontal cortex (PFC) in 24 adult men with non-medicated high-functioning ASDs and 25 age-, IQ- and parental-socioeconomic-background-matched men with typical development (TD). Multivariate analyses of covariance demonstrated significantly high N -acetylaspartate (NAA) level in the ASD subjects compared with the TD subjects (F=4.83, P =0.033). The low NAA level showed a significant positive correlation with advanced age in the TD group ( r =−0.618, P =0.001), but was not evident among the ASD individuals ( r =0.258, P =0.223). Fisher’s r -to- z transformation showed a significant difference in the correlations between the ASD and TD groups ( Z =−3.23, P =0.001), which indicated that the age–NAA relationship was significantly specific to people with TD. The current 1 H-MRS study provided new evidence that atypical age-related change of neurochemical aspects of brain maturation in ASD individuals expands beyond childhood and persists during adulthood.
doi_str_mv 10.1038/tp.2012.108
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Numerous neuroimaging studies have focused on childhood to investigate atypical age-related change of brain structure and function, because it is a period of neuron and synapse maturation. Recent studies, however, have shown that the atypical age-related structural change of autistic brain expands beyond childhood and constitutes neural underpinnings for lifelong difficulty to behavioral adaptation. Thus, we examined effects of aging on neurochemical aspects of brain maturation using 3-T proton magnetic resonance spectroscopy ( 1 H-MRS) with single voxel in the medial prefrontal cortex (PFC) in 24 adult men with non-medicated high-functioning ASDs and 25 age-, IQ- and parental-socioeconomic-background-matched men with typical development (TD). Multivariate analyses of covariance demonstrated significantly high N -acetylaspartate (NAA) level in the ASD subjects compared with the TD subjects (F=4.83, P =0.033). The low NAA level showed a significant positive correlation with advanced age in the TD group ( r =−0.618, P =0.001), but was not evident among the ASD individuals ( r =0.258, P =0.223). Fisher’s r -to- z transformation showed a significant difference in the correlations between the ASD and TD groups ( Z =−3.23, P =0.001), which indicated that the age–NAA relationship was significantly specific to people with TD. 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The low NAA level showed a significant positive correlation with advanced age in the TD group ( r =−0.618, P =0.001), but was not evident among the ASD individuals ( r =0.258, P =0.223). Fisher’s r -to- z transformation showed a significant difference in the correlations between the ASD and TD groups ( Z =−3.23, P =0.001), which indicated that the age–NAA relationship was significantly specific to people with TD. 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subjects 631/136/7
631/378/1689/1373
631/45/882
692/700/1421/65
Adult
Age Factors
Aging - metabolism
Aspartic Acid - analogs & derivatives
Aspartic Acid - metabolism
Asperger Syndrome - metabolism
Autistic Disorder - metabolism
Behavioral Sciences
Biological Psychology
Humans
Magnetic Resonance Imaging
Magnetic Resonance Spectroscopy
Male
Medicine
Medicine & Public Health
Multivariate Analysis
Neurosciences
Original
original-article
Pharmacotherapy
Prefrontal Cortex - metabolism
Psychiatry
title Absence of age-related prefrontal NAA change in adults with autism spectrum disorders
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