• Journal of neurotrauma · Jun 2018

    Poor Motor-Function Recovery after Spinal Cord Injury in Anxiety-Model Mice with Phospholipase C-Related Catalytically Inactive Protein Type 1 Knockout.

    • Taka Fujita, Gentaro Kumagai, Xizhe Liu, Kanichiro Wada, Toshihiro Tanaka, Hitoshi Kudo, Toru Asari, Tatsuhiro Fukutoku, Ayako Sasaki, Yohshiro Nitobe, Yoshikazu Nikaido, Furukawa Ken-Ichi KI 4 Department of Pharmacology, Hirosaki University Graduate School of Medicine , Hirosaki, Japan ., Masato Hirata, Takashi Kanematsu, Shinya Ueno, and Yasuyuki Ishibashi.
    • 1 Department of Orthopedic Surgery, Hirosaki University Graduate School of Medicine , Hirosaki, Japan .
    • J. Neurotrauma. 2018 Jun 15; 35 (12): 1379-1386.

    AbstractMice with a knockout of phospholipase C (PLC)-related inactive protein type 1 (PRIP1-/- mice) display anxiety-like behavior and altered γ-aminobutyric acid (GABA)A-receptor pharmacology. Here, we examined associations between anxiety and motor-function recovery in PRIP1-/- mice after a spinal cord injury (SCI) induced by a moderate contusion injury at the 10th thoracic level. Uninjured PRIP1-/- mice showed less distance than wild-type (WT) mice in the center 25% in an open field test (OFT), indicating anxiety-like behavior. Anxiety behavior increased in both WT and PRIP1-/- mice after SCI. WT and PRIP1-/- mice were completely paralyzed on day 1 after SCI, but gradually recovered until reaching a plateau at ∼4 weeks. After SCI, the PRIP1-/- mice had significantly greater motor dysfunction than the WT mice. In WT mice after SCI, the percentage of distance spent in the center 25% of the OFT was correlated with the OFT distance traveled and velocity, and with the reaction time in a plantar pressure-sensitivity mechanical test. In PRIP1-/- mice after SCI, the percentage of distance spent in the center 25% of the OFT was correlated with the OFT distance traveled and with the latency to fall in the rotarod test. Six weeks after SCI, ionized calcium binding adaptor molecule 1 (Iba1) and glial fibrillary acidic protein (GFAP) expressions were elevated at the lesion epicenter in PRIP1-/- mice, and spinal cord atrophy and demyelination were more severe than in WT mice. The axonal fiber development was also decreased in PRIP1-/- mice, consistent with the poor motor-function recovery after SCI in these mice.

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