Postnatal repeated maternal deprivation produces age-dependent changes of brain-derived neurotrophic factor expression in selected rat brain regions.
BACKGROUND
Adverse life events occurring early in development may alter the correct program of brain maturation and render the organism more vulnerable to psychiatric disorders. Identification of persistent changes associated with these events is crucial for the development of novel therapeutic strategies.


METHODS
We used postnatal repeated maternal deprivation (MD) from postnatal day (PND) 2-14 to investigate changes in brain-derived neurotrophic factor (BDNF) levels. RNase protection assay and enzyme linked immunosorbent assay were employed to determine the anatomic profile of neurotrophin expression at different ages following MD.


RESULTS
We found that MD produces a short-term up-regulation of neurotrophin expression in hippocampus and prefrontal cortex, as measured on PND 17, whereas at adulthood, a selective reduction of BDNF expression was observed in prefrontal cortex. When adult animals were challenged with a chronic swim stress paradigm, both a reduced expression of BDNF in prefrontal cortex and a significant reduction in striatal protein levels were found only in control subjects, whereas levels in the MD group were not further decreased.


CONCLUSIONS
Our data suggest that MD produces a significant reduction of BDNF expression within prefrontal cortex and striatum, which may render these structures less plastic and more vulnerable under challenging conditions.
Roceri
Mila
M
Department of Pharmacological Sciences and Center of Excellence for Neurodegenerative Disorders, University of Milan, Milan, Italy.
Cirulli
Francesca
F
Pessina
Cassandra
C
Peretto
Paolo
P
Racagni
Giorgio
G
Riva
Marco A
MA
D000375:Aging / Q000235:genetics*; D000818:Animals; D000831:Animals, Newborn; D001143:Arousal / Q000235:genetics; D001921:Brain / Q000378:metabolism*; D019208:Brain-Derived Neurotrophic Factor / Q000235:genetics*; D003342:Corpus Striatum / Q000378:metabolism; D004195:Disease Models, Animal; D005260:Female; D005625:Frontal Lobe / Q000378:metabolism; D015870:Gene Expression / Q000502:physiology; D006624:Hippocampus / Q000378:metabolism; D008297:Male; D008426:Maternal Deprivation; D009473:Neuronal Plasticity / Q000235:genetics; D017397:Prefrontal Cortex / Q000378:metabolism; D011247:Pregnancy; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D012016:Reference Values; D012559:Schizophrenia / Q000235:genetics*; D013315:Stress, Psychological / Q000150:complications
D019208:Brain-Derived Neurotrophic Factor; D012333:RNA, Messenger