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Adenosinergic Modulation of Layer 6 Microcircuitry in the Medial Prefrontal Cortex Is Specific to Presynaptic Cell
Chao Ding1, Danqing Yang2,3, Dirk Feldmeyer2,3,4
1Research Center Juelich, Institute of Neuroscience and Medicine 10, Research Center Juelich, Juelich 52425, Germany.
Summary
Adenosine differentially affects two types of medial prefrontal cortex (mPFC) layer 6 neurons. Upright neurons show higher sensitivity to adenosine, impacting neurotransmitter release via A1 adenosine receptors (A1ARs).
Area of Science:
- Neuroscience
- Cellular and Molecular Neuroscience
- Neurophysiology
Background:
- Adenosine signaling in the prefrontal cortex (PFC) influences critical behaviors like sleep, decision-making, and anxiety.
- Layer 6 (L6) principal neurons in the PFC display morphological diversity, yet their specific adenosinergic regulation remains unclear.
- Understanding cell-specific adenosine actions is crucial for deciphering PFC circuit function.
Purpose of the Study:
- To investigate the cell-specific effects of adenosine on L6 excitatory neurons in the rat medial prefrontal cortex (mPFC).
- To characterize the morphological and electrophysiological properties of distinct L6 neuron subtypes.
- To determine the role of adenosine receptors, particularly A1 adenosine receptors (A1ARs), in modulating synaptic transmission in these subtypes.
Main Methods:
- Whole-cell recordings and morphological reconstructions of L6 neurons in rat mPFC.
- Quantitative analysis of neuronal morphology and electrophysiological parameters.
- Application of varying adenosine concentrations and pharmacological blockade of A1ARs using 8-cyclopentyltheophylline (CPT).
Main Results:
- Two distinct morphological subtypes of excitatory L6 neurons were identified: 'upright' (dendrites towards pial surface) and 'inverted' (dendrites towards white matter).
- These subtypes exhibited different electrophysiological and synaptic properties.
- Low concentrations of adenosine (10 µM) selectively inhibited synaptic release more strongly from upright L6 neurons, mediated by A1ARs.
Conclusions:
- The study reveals differential expression and function of A1ARs at presynaptic sites of morphologically and functionally distinct L6 neuron subpopulations.
- Adenosine exerts intricate, cell-specific modulatory control over neuronal signaling within the mPFC.
- These findings highlight the complexity of adenosinergic neuromodulation in higher cognitive functions.
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