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2016 ; 30
(8
): 794-800
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English Wikipedia
Paradoxical Motor Recovery From a First Stroke After Induction of a Second
Stroke: Reopening a Postischemic Sensitive Period
#MMPMID26721868
Zeiler SR
; Hubbard R
; Gibson EM
; Zheng T
; Ng K
; O'Brien R
; Krakauer JW
Neurorehabil Neural Repair
2016[Sep]; 30
(8
): 794-800
PMID26721868
show ga
BACKGROUND AND OBJECTIVE: Prior studies have suggested that after stroke there is
a time-limited period of increased responsiveness to training as a result of
heightened plasticity-a sensitive period thought to be induced by ischemia
itself. Using a mouse model, we have previously shown that most
training-associated recovery after a caudal forelimb area (CFA) stroke occurs in
the first week and is attributable to reorganization in a medial premotor area
(AGm). The existence of a stroke-induced sensitive period leads to the
counterintuitive prediction that a second stroke should reopen this window and
promote full recovery from the first stroke. To test this prediction, we induced
a second stroke in the AGm of mice with incomplete recovery after a first stroke
in CFA. METHODS: Mice were trained to perform a skilled prehension
(reach-to-grasp) task to an asymptotic level of performance, after which they
underwent photocoagulation-induced stroke in CFA. After a 7-day poststroke delay,
the mice were then retrained to asymptote. We then induced a second stroke in the
AGm, and after only a 1-day delay, retrained the mice. RESULTS: Recovery of
prehension was incomplete when training was started after a 7-day poststroke
delay and continued for 19 days. However, a second focal stroke in the AGm led to
a dramatic response to 9 days of training, with full recovery to normal levels of
performance. CONCLUSIONS: New ischemia can reopen a sensitive period of
heightened responsiveness to training and mediate full recovery from a previous
stroke.