Historical development of current concepts on central chemosensitivity

Area of Science:

• Neuroscience
• Physiology

Background:

• The historical understanding of central chemosensitivity has evolved significantly.
• Early theories proposed chemoreception as a property of brainstem respiratory neurons.

Observation:

• The precise mechanism by which acid-base disturbances influence cardiorespiratory adaptation remains unclear.
• While peripheral chemoreceptors were identified, specific central chemoreceptors for pH or pCO2 have not been definitively isolated.
• Chemosensitive areas in the medulla oblongata have been mapped, but distinct receptor identification is lacking.

Findings:

• The reaction theory highlights protons as key stimuli, but requires consideration of the relevant compartment.
• Direct chemosensitivity of bulbospinal sympathoexcitatory neurons has been recently demonstrated.
• Evidence suggests that central cardio-respiratory neurons may possess intrinsic chemosensitivity.

Implications:

• Revisiting the concept of central chemoreception as a function of central cardio-respiratory neurons offers a promising avenue for future research.
• Understanding central chemosensitivity is vital for elucidating cardiorespiratory control mechanisms.
• This research informs the study of respiratory regulation and acid-base balance.