ReviewAdolescent cortical development: A critical period of vulnerability for addiction
Section snippets
Introduction: Adolescence; a unique period of development
Adolescence is a critical period of development during the transition from childhood to adulthood. The ages associated with adolescence are commonly considered in humans to be approximately 12 to 20–25 years of age, and postnatal days (PND) 28 to 42 (Spear, 2000) in rodents. Adolescence is best defined by characteristic adolescent behaviors that include high levels of risk-taking, high exploration, novelty and sensation seeking, social interaction, high activity and play behaviors that likely
Adolescent brain remodeling
The adolescent brain is in a unique state of transition as it undergoes both progressive and regressive changes providing a biological basis for the unique adolescent behaviors and the associated changes in behavior during maturation to adulthood. Human magnetic resonance imaging (MRI) studies have demonstrated an inverted U-shape change in the gray matter volume during adolescent period, with a pre-adolescent increase followed by a post-adolescent decrease (Giedd et al., 1999, Giedd, 2004). At
Critical periods of cortical development
Critical periods are specific windows during development when both genetic driven processes and environmental processes, e.g. nature and nurture, interact to establish functional characteristics. These interactions correspond to structural rearrangements of the cerebral cortex that occur during this specific developmental window. As described above, cortical development in humans occurs over the first 3 decades of life with grey matter changes correlating with post-mortem findings of brain
Glutamate and NMDA receptor systems
The binding of cortical glutamate to its NMDA receptor subtype peaks in early adolescence, and declines significantly thereafter, with a loss of one-third of NMDA receptors by PND60 (Insel et al., 1990, Guilarte, 1998). Such synaptic pruning contributes to the loss of excitatory glutamate input to NAc (Frantz and Van Hartesveldt, 1999a) and a reduction in accumbal NMDA receptors (Frantz and Van Hartesveldt, 1999b) during adolescent brain maturation. Interestingly, long-term potentiation (LTP),
Transcription factor CREB and growth factor BDNF in adolescence
The cAMP-response element binding protein (CREB) is an important mediator for the differentiation and maturation of CNS neurons. CREB is also critical for induction of trophic factors such as BDNF, for neuronal vitality and for learning and memory (Bender et al., 2001, Zou and Crews, 2006). Through phosphorylation, CREB is activated to propagate signals from synapses to the nucleus to the expression of genes necessary for synaptic plasticity (Martin and Kandel, 1996, Silva et al., 1998, Bender
Neurogenic processes in adolescent brains
Although neurogenesis is primarily an early developmental process with most neurons being formed in the prenatal and early postnatal periods, it continues into adulthood within specific adult brain regions including the forebrain subventricular zone (SVZ) and hippocampal dentate gyrus (DG) where neurogenesis continues into senescence. Generating and integrating new neurons into preexisting neuronal circuits is believed to enable the hippocampus to adapt to novel and more complex situations (
Adolescent behavior: Risky, motivated, and vulnerable
As just noted, the adolescent brain undergoes remodeling in a variety of structural and functional regions, particularly corticolimbic and frontal regions known to regulate emotional as well as analytical and executive processes. Simultaneous with these changes, adolescents demonstrate new behaviors that are associated with acquisition of adult cognitive and emotional repertoires (Yates, 1996). These are normal adaptive changes that help usher the adolescent into adulthood. However, adolescents
Adolescent alcohol abuse is common
Alcohol use among adolescents is common. As described earlier, adolescent high risk-taking, thrill and novelty-seeking behaviors promote heavy drinking and other drug experimentation. Individuals in their teens and early twenties are among the heaviest episodic drinkers. For example, among U.S. high school students 12% of 8th graders (13–14 years of age), 22% of 10th graders and 28% of 12th grade seniors reported heavy episodic drinking within the past 2 weeks (Johnston et al., 2004). According
Binge drinking during critical periods in cortical development may lead to life long changes of executive function
The effects of alcohol on adolescent brains are different from those on adults. Adolescents are less sensitive to the sedative effects of alcohol (Silveri and Spear, 1998), which allows them to binge drink, however, they are more vulnerable to alcohol-induced neurotoxicity (Monti et al., 2005). The increase in sensitivity of the adolescent brain to toxicity and the dynamic synaptic remodeling of the maturing adolescent brain may enhance the strong learning components of heavy drinking behaviors
Summary
Adolescence represents an important period of brain development, particularly for the cerebral cortex. There are critical periods of development when the cortex is sensitive to environment induced changes in synaptic strength. Between the ages of 10 and 25 years there are major changes in synaptic receptors and density as well as myelination of frontal cortical areas important for impulse control, goal setting, motivation, interpersonal interactions, reasoning, assessment of rewards and
Acknowledgements
This research is supported by NIAAA. We would also like to thank Melissa Mann for manuscript preparation.
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