Developmental switch in neurovascular coupling in the immature rodent barrel cortex

Area of Science:

• Neuroscience
• Developmental Biology
• Physiology

Background:

• Neurovascular coupling (NVC) matches brain oxygen and glucose supply to neural activity.
• Understanding NVC is crucial for interpreting brain activity, especially in developing brains.
• The role of NVC during development remains largely unknown.

Purpose of the Study:

• To investigate the developmental changes in NVC within the murine barrel cortex.
• To compare NVC function in early development (postnatal day 7) versus later development (postnatal day 30).

Main Methods:

• In vivo electrophysiological recordings (multi-electrode) and laser-Doppler flowmetry (LDF) in mouse barrel cortex.
• Stimulation of the whisker-to-barrel cortex pathway in P7 and P30 mice.
• Measurement of multi-unit activity (MUA) and regional cerebral blood flow (rCBF).

Main Results:

• NVC undergoes a significant physiological shift during the first postnatal month.
• In P7 mice, prolonged whisker stimulation led to decreased rCBF and MUA fatigue.
• In P30 mice, stable MUA during stimulation was associated with increased rCBF, similar to adult NVC.

Conclusions:

• The observed shift in NVC is a critical aspect of cortical development.
• This developmental change in NVC is vital for accurately interpreting brain activity in immature central nervous systems, including fMRI studies.