Alteration of Serotonergic Receptors in the Brain Stems of Human Patients with Respiratory Disorders

 

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Abstract

We compared the developmental changes of 5-hydroxytryptamine (5-HT) 1 A and 5-HT2 A receptor immunoreactivity in the nuclei in relation to the cardiorespiratory or autonomic function in the human brain stem in sudden infant death syndrome (SIDS) and congenital central hypoventilation syndrome (CCHS) patients and age-matched controls by means of immunohistochemical methods. There were significant decreases in 5-HT1 A and 5-HT2 A receptor immunoreactivity in the dorsal nucleus of the vagus, solitary nucleus and ventrolateral medulla in the medulla oblongata, and significant increases in the periaqueductal gray matter (PAG) of the midbrain in SIDS victims, but there were no significant differences between those in CCHS patients and controls. The decreased immunoreactivity of the receptors in the medulla oblongata was accompanied by brain stem gliosis. Therefore, the decreases in the receptors may be secondary to chronic hypoxia or repeated ischemia, but may be causally related to some impairment of the developing cardiorespiratory neuronal system. As 5-HT1 A and 5-HT2 A receptors were the most abundant in the fetal period and then decreased with subsequent development, the increases in 5-HT1 A and 5-HT2 A receptor immunoreactivity in PAG may reflect delayed neuronal maturation, but may also reflect compensatory changes in response to hypofunctioning serotonergic neurons in the medulla oblongata in SIDS. There was no abnormal expression of 5-HT1 A and 5-HT2 A receptors in CCHS brain stems, and so the pathophysiology seems to be different between SIDS and CCHS patients.

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M. D. Yuri Ozawa

Department of Neonatology
Toho University School of Medicine

6 - 11 - 1, Ohmorinishi, Ohta

Tokyo 143 - 8541

Japan

Email: hy_ozawa@d6.dion.ne.jp