Axonal transport involvement in long-lasting synaptic modifications in Blatta orientalis

Area of Science:

• Neuroscience
• Cell Biology
• Insect Physiology

Background:

• Synaptic transmission can undergo long-lasting modifications.
• The role of axonal transport in these synaptic changes is not fully understood.

Purpose of the Study:

• To investigate the role of axonal transport in establishing long-lasting synaptic modifications.
• To examine the effects of colchicine on axonal transport and synaptic facilitation in the cockroach nerve cord.

Main Methods:

• Inducing hyperactivity in the cockroach (Blatta orientalis) nerve cord via a lead weight.
• Applying colchicine to the prothoracic ganglion to inhibit axonal transport.
• Measuring synaptic facilitation in the metathoracic ganglion.
• Analyzing the effects of colchicine on protein transport components.

Main Results:

• Hyperactivity facilitated synaptic transmission.
• Colchicine reversibly blocked synaptic facilitation and interfered with protein transport.
• Colchicine's effects on axonal transport components (2, 10, 25, 75, 150 mm/day) temporally correlated with synaptic inhibition.
• Colchicine acted directly on axonal transport in the prothoracic ganglion.

Conclusions:

• Axonal transport is essential for the establishment of long-lasting synaptic modifications.
• The temporal correlation between altered axonal transport and inhibited synaptic facilitation supports this conclusion.