Substrain- and sex-dependent differences in stroke vulnerability in C57BL/6 mice

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Abstract

The C57BL/6 mouse strain is represented by distinct substrains, increasingly recognized to differ genetically and phenotypically. The current study compared stroke vulnerability among C57BL/6 J (J), C57BL/6JEiJ (JEiJ), C57BL/6ByJ (ByJ), C57BL/6NCrl (NCrl), C57BL/6NJ (NJ) and C57BL/6NTac (NTac) substrains, using a model of permanent distal middle cerebral artery and common carotid artery occlusion. Mean infarct volume was nearly two-fold smaller in J, JEiJ and ByJ substrains relative to NCrl, NJ and NTac (N-lineage) mice. This identifies a previously unrecognized confound in stroke studies involving genetically modified strain comparisons if control substrain background were not rigorously matched. Mean infarct size was smaller in females of J and ByJ substrains than in the corresponding males, but there was no sex difference for NCrl and NJ mice. A higher proportion of small infarcts in J and ByJ substrains was largely responsible for both substrain- and sex-dependent differences. These could not be straightforwardly explained by variations in posterior communicating artery patency, MCA anatomy or acute penumbral blood flow deficits. Their larger and more homogeneously distributed infarcts, together with their established use as the common background for many genetically modified strains, may make N-lineage C57BL/6 substrains the preferred choice for future studies in experimental stroke.

Original languageEnglish (US)
Pages (from-to)426-438
Number of pages13
JournalJournal of Cerebral Blood Flow and Metabolism
Volume39
Issue number3
DOIs
StatePublished - Mar 1 2019

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Inbred C57BL Mouse
Sex Characteristics
Stroke
Common Carotid Artery
Middle Cerebral Artery
Anatomy
Arteries

All Science Journal Classification (ASJC) codes

  • Neurology
  • Clinical Neurology
  • Cardiology and Cardiovascular Medicine

Cite this

Substrain- and sex-dependent differences in stroke vulnerability in C57BL/6 mice. / Zhao, Liang; Mulligan, Megan; Nowak, Thaddeus.

In: Journal of Cerebral Blood Flow and Metabolism, Vol. 39, No. 3, 01.03.2019, p. 426-438.

Research output: Contribution to journalArticle

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