Viral vector-based reversible neuronal inactivation and behavioral manipulation in the macaque monkey.

Area of Science:

• Neuroscience
• Viral Vector Technology
• Primate Research

Background:

• Viral vectors offer high specificity for neural circuit dissection.
• Applications in rodent models are common, but less explored in non-human primates.
• Non-human primates are crucial for understanding complex behaviors and neural circuits.

Purpose of the Study:

• To investigate the feasibility of using viral vectors to manipulate non-human primate behavior.
• To assess the efficacy of the allatostatin receptor/allatostatin (AlstR/AL) system for neuronal inactivation in primate V1.
• To determine if viral vector-induced neural manipulation can alter performance in a behavioral task.

Main Methods:

• Adeno-associated virus 1 (AAV1) vector expressing AlstR was injected into V1 of two monkeys.
• Monkeys were trained on a peripheral target detection task.
• Allatostatin (AL) was administered to inactivate AlstR-expressing neurons.
• Behavioral performance was assessed, and post-mortem histology confirmed vector expression.

Main Results:

• One monkey exhibited a retinotopic deficit in the detection task after AL injection, impairing performance at the injection site.
• Control injections (saline or AL without AlstR) did not cause deficits.
• The second monkey showed no behavioral impairment, correlating with very low AlstR expression.
• Histology confirmed AlstR expression in the affected monkey.

Conclusions:

• Viral vector-based approaches can successfully manipulate neuronal activity and influence behavior in non-human primates.
• This technique holds promise for studying neural circuits underlying complex behaviors in primates.
• Further development is warranted for robust application in primate neuroscience research.