Bilateral alteration in stepping pattern after unilateral motor cortex injury: a new test strategy for analysis of skilled limb movements in neurological mouse models

J Neurosci Methods. 2006 May 15;153(1):104-13. doi: 10.1016/j.jneumeth.2005.10.011. Epub 2005 Nov 22.

Abstract

Mice are becoming increasingly popular to model neurological disease and motor system dysfunction. For evaluation of discrete, chronic motor impairments, skilled limb movements represent a valuable extension of standard mouse test batteries. This study introduces an efficient and sensitive test strategy for comprehensive assessment of skilled fore- and hind-limb stepping in mice. Adult C57BL/6 mice were trained and video-recorded in two walking tasks, the widely used rotorod test and a new ladder rung task. The animals then received a unilateral ischemic lesion in the motor cortex forelimb and hind limb area and were video-recorded on days 12 and 26 post-lesion. Forelimb and hind limb stepping movements were rated using a combination of endpoint measures and qualitative assessment. The results showed that while animals maintained a weight-supported gait, posture and stepping movements were abnormal at both post-operative intervals. The rotorod analysis revealed stepping deficits in both forelimbs that led to adoption of compensatory movement strategies. The ladder rung task revealed stepping errors in ipsi- and contralateral fore- and hind-limbs. The findings demonstrate that this test strategy provides comprehensive assessment of motor impairments in mice and that qualitative movement analysis is a valuable tool for elaborating subtle motor disturbances.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Brain Ischemia / classification
  • Brain Ischemia / complications
  • Brain Ischemia / diagnosis
  • Brain Ischemia / physiopathology*
  • Disease Models, Animal*
  • Gait Disorders, Neurologic / classification*
  • Gait Disorders, Neurologic / diagnosis
  • Gait Disorders, Neurologic / physiopathology*
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Motor Skills*
  • Movement Disorders / classification
  • Movement Disorders / diagnosis
  • Movement Disorders / etiology
  • Movement Disorders / physiopathology
  • Nervous System Diseases / classification
  • Nervous System Diseases / diagnosis
  • Nervous System Diseases / etiology
  • Nervous System Diseases / physiopathology
  • Rotarod Performance Test / methods*
  • Severity of Illness Index
  • Task Performance and Analysis*