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突然の乳児死亡症候群における脳幹のセロトニンジック欠乏症
Jhodie R Duncan1, David S Paterson, Jill M Hoffman
1Department of Pathology, Children's Hospital Boston, 300 Longwood Ave, Boston, MA 02115, USA.
JAMA
|February 4, 2010
まとめ
突然の乳児死亡症候群 (SIDS) は,脳幹におけるセロトニン (5-HT) とトリプトファンヒドロキシラーゼ (TPH2) のレベル低下と関連しています. これは,セロトニン欠乏障害がSIDSに寄与する可能性があることを示唆しています.
科学分野:
- 神経科学は神経科学である.
- バイオケミストリー バイオケミストリー
- 小児科は小児科です.
背景:
- 突然の幼児死亡症候群 (SIDS) は,自律的機能と呼吸の脳幹制御の障害から生じるという仮説があります.
- 以前の研究では,SIDSの乳児の長頸髄におけるセロトニン (5-hydroxytryptamine [5-HT]) 受容体結合の異常が示唆されています.
研究 の 目的:
- SIDSの乳児における5-HT受容体の異常が,5-HTのレベル低下,その合成酵素トリプトファンヒドロキシラーゼ (TPH2) またはその両方に関連しているかどうかを調査する.
主な方法:
- 解剖研究では,5-HT,その代謝産物である5-ヒドロキシインドロアセチウム酸 (5-HIAA),TPH2レベル,および5-HT (~1A) 受容体結合を髄膜核で分析した.
- この研究では41人のSIDS症例を調査し,既知の原因で急性死亡した7人の乳児と,慢性的な低酸素血症で入院した5人の乳児と比較した.
主要な成果:
- SIDS症例は,対照群と比較して,ラフェ・オブスカルスとパラギガントセルラリス・ラテラリス (PGCL) で5HT濃度が有意に低いことを示した.
- また,TPH2レベルは,SIDSの乳児のラフェ・オブスクーラスでも低下しました.
- SIDSの症例では,いくつかの髄膜核で5-HT(1A) 受容体結合が低下しており,一部の地域では年齢に関係する減少が観察されています.
結論:
- SIDSは,脳中にある5-HTとTPH2のレベルが低下することと関連しています.
- これらの発見は,SIDSに寄与する髄膜セロトニン欠乏障害の仮説を支持する.
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