Сравнительное исследование температурного коэффициента Q10 гибернирующих сусликов Urocitellus undulatus и охлажденных крыс разного возраста
- Авторы: Захарова Н.М.1, Тараховский Ю.С.1,2, Хренов М.О.1
- 
							Учреждения: 
							- Институт биофизики клетки РАН
- Институт теоретической и экспериментальной биофизики РАН
 
- Выпуск: Том 60, № 5 (2024)
- Страницы: 499-508
- Раздел: ЭКСПЕРИМЕНТАЛЬНЫЕ СТАТЬИ
- URL: https://rjeid.com/0044-4529/article/view/648101
- DOI: https://doi.org/10.31857/S0044452924050045
- EDN: https://elibrary.ru/XPMDWF
- ID: 648101
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		                                					Аннотация
Проведен анализ температурного коэффициента Q10 частоты сердечных сокращений (Q10HR) и потребления кислорода (Q10Ox) при пробуждении длиннохвостых сусликов Urocitellus undulatus, а также при отогревании предварительно охлажденных взрослых крыс и крысят. Величину Q10Ox вычисляли по стандартной формуле, тогда как для вычисления Q10HR формула была эмпирически модифицирована для отслеживания изменений этого параметра в широком диапазоне температур тела (Tb). Установлено, что у сусликов в начальный период выхода из спячки, при Tb ≤ 10 ℃, наблюдались высокие значения температурных коэффициентов Q10HR = 40 – 50 и Q10Ox = 6 – 7. Еще более высокие значения Q10HR > 100 были обнаружены в начале отогревания крысят, хотя у них был низкий уровень Q10Ox = 1.2. Взрослые крысы не выдерживали охлаждения ниже 16 ℃ и демонстрировали умеренную вариабельность как Q10HR = 2.0 – 4.0, так и Q10Ox = 2.0 – 2.2. В процессе восстановления нормальной Tb значения Q10HR у всех животных приближались к величине ~2.0, предсказанной правилом Вант Гоффа-Аррениуса для химических реакций в живой и неживой природе. Мы предполагаем, что высокие значения Q10HR и Q10Ox, обнаруженные в ранний период выхода сусликов из гибернации, могут свидетельствовать о функционировании адаптационных механизмов, направленных на ускорение согревания тела. Устойчивость к охлаждению и высокий коэффициент Q10HR у крысят, как представителей отряда Rodentia, к которому относятся также естественные гибернаторы — суслики, могут свидетельствовать о функционировании в ювенальный период крыс рудиментарных механизмов адаптации к охлаждению и гетеротермии.
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	                        Об авторах
Н. М. Захарова
Институт биофизики клетки РАН
							Автор, ответственный за переписку.
							Email: n_m_zakharova@pbcras.ru
				                					                																			                												                	Россия, 							Пущино						
Ю. С. Тараховский
Институт биофизики клетки РАН; Институт теоретической и экспериментальной биофизики РАН
														Email: tarahov@rambler.ru
				                					                																			                												                	Россия, 							Пущино; Пущино						
М. О. Хренов
Институт биофизики клетки РАН
														Email: n_m_zakharova@pbcras.ru
				                					                																			                												                	Россия, 							Пущино						
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