Normal biological rhythms, including sleep, are very important for a healthy life
and their disturbance may induce—among other issues—memory impairment, which is a
key problem of many psychiatric pathologies. The major brain center of circadian regulation
is the suprachiasmatic nucleus, and vasopressin (AVP), which is one of its main neurotransmitters,
also plays a key role in memory formation. In this review paper, we aimed to summarize
our knowledge on the vasopressinergic connection between sleep and memory with the
help of the AVP-deficient Brattleboro rat strain. These animals have EEG disturbances
with reduced sleep and impaired memory-boosting theta oscillation and show memory
impairment in parallel. Based upon human and animal data measuring AVP levels, haplotypes,
and the administration of AVP or its agonist or antagonist via different routes (subcutaneous,
intraperitoneal, intracerebroventricular, or intranasal), V1a receptors (especially
of hippocampal origin) were implicated in the sleep-memory interaction. All in all,
the presented data confirm the possible connective role of AVP between biological
rhythms and memory formation, thus, supporting the importance of AVP in several psychopathological
conditions.
