Met-enkephalin-like immunoreactivity in microdialysates from the respiratory-related nucleus tractus solitarii was determined simultaneously with ventilatory responses in seven, spontaneously breathing, developing swine under conditions of normoxia, hypoxia and recovery from hypoxia for 30 min each. Assayed levels of Met-enkephalin-like immunoreactivity in normoxia were 0.89±0.23 pg/μl. These levels increased to 203.6±32.2% and 283.1±55.8% of control during hypoxia and recovery, respectively. Hyperventilation during hypoxia was not sustained, comprising brief stimulation followed by return to near-control level. Taken together, these results provide further evidence that opioid release may contribute to the suppression of ventilation in hypoxia during development.
Brain Research – Elsevier
Published: Jul 31, 1995
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