AI Insight
This study investigated hippocampal synaptic plasticity in nonhuman primates (NHPs), focusing on a well-characterized mechanism of learning and memory called long-term potentiation (LTP). While theta-burst stimulation induced LTP in NHPs similarly to rodents, a key difference emerged: NHPs showed a significantly lower threshold for synaptic tagging and capture (STC), a process that allows weak synaptic events to be stabilized through association with stronger ones. This divergence was accompanied by elevated expression of plasticity-related proteins (PKMζ and BDNF), suggesting that protein synthesis-dependent memory consolidation mechanisms are more readily recruited in primates than in rodents.
Why it matters
These findings suggest that rodent models may systematically underestimate the complexity of associative memory mechanisms relevant to humans, which has direct implications for how we develop and evaluate treatments for memory-related disorders such as Alzheimer's disease.
⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Long-term potentiation (LTP) is a key cellular mechanism underlying learning and memory, but its conservation across species remains unclear. Using nonhuman primates (NHPs), we examined hippocampal synaptic plasticity at Schaffer collateral-CA1 synapses. Theta-burst stimulation (TBS) reliably induced LTP in NHPs, comparable to rodents. However, unlike rodents, TBS in NHPs readily engaged synaptic tagging and capture (STC), indicating a lower threshold for associative plasticity. This was accompanied by increased expression of plasticity-related proteins, including PKM{zeta} and BDNF, suggesting enhanced recruitment of protein synthesis dependent stabilization mechanisms. These findings reveal a species-specific divergence in the molecular regulation of persistent synaptic plasticity and identify an evolutionary specialization in mechanisms supporting associative memory. Together, our results highlight limitations of rodent models in fully capturing human-relevant memory processes and underscore the importance of primate systems for translational neuroscience.
Source: Primate Hippocampus Reveals Distinct Rules for Associative Synaptic Plasticity