Дозозависимые изменения метаболома при радиационной нефропатии: современное состояние и перспективы поиска биомаркеров

Ионизирующее излучение оказывает выраженное нефротоксическое воздействие, инициируя каскад патофизиологических процессов, ведущих к развитию радиационной нефропатии (РН) и почечной недостаточности. Данный обзор посвящен анализу современного состояния исследований в области идентификации метаболомных биомаркеров, позволяющих проводить раннюю диагностику и прогнозирование радиационного повреждения почек при внешнем облучении. В работе систематизированы данные литературы, полученные с применением масс-спектрометрии (МС) и ядерного магнитного резонанса (ЯМР), в отношении изменений профилей низкомолекулярных метаболитов в моче. Основное внимание уделено глубоким нарушениям пуринового обмена (преимущественно за счет накопления ксантина и гипоксантина), критическим сдвигам в цикле трикарбоновых кислот (ЦТК), отражающим митохондриальную дисфункцию, а также дисбалансу липидного профиля, включая накопление ацилкарнитинов. Эти метаболические перестройки выступают ключевыми индикаторами окислительного стресса и дисфункции проксимальных канальцев, причем степень их выраженности напрямую коррелирует с клинико-дозиметрическими параметрами. В обзоре детально рассмотрены критические дозовые пороги: умеренные функциональные сдвиги манифестируют при поглощенной дозе на почки более 4 Гр, тогда как необратимая структурная деградация и манифестная РН развиваются при превышении порога в 10 Гр. Авторы подчеркивают, что внедрение метаболомного профилирования в клиническую практику способно радикально повысить эффективность мониторинга состояния пациентов, перенесших радиационное воздействие. В отличие от классических белковых маркеров повреждения (NGAL, KIM-1), чувствительных лишь на поздних стадиях, динамические паттерны ацилкарнитинов, интермедиатов ЦТК и метаболитов пуринов позволяют проводить раннюю биодозиметрию. Это дает возможность не просто фиксировать факт лучевого поражения, но и оценивать полученную дозу радиации в первые же часы после экспозиции для своевременной нефропротекторной терапии.

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