Turkish Neurosurgery
Functional Reorganization in the Primary Somatosensory Cortex of Rat Following Hind-Paw Amputation: A Study of Functional Imaging with 1.5 Tesla MRI
Murat Şakir Ekşi1, Emel Özcan-Ekşi2, Ayça Arslanhan3, Hakan Şirinoğlu4, Sertaç Erbil3, Abuzer Güngör1, Oktay Algın5, Deniz Konya8
1Acıbadem Mehmet Ali Aydınlar University, School of Medicine, Neurosurgery, Istanbul,
2Bahçeşehir University, School of Medicine, Physical Medicine and Rehabilitation, Istanbul,
3Marmara University, Institute of Neurological Sciences, Istanbul,
4Dr. Lütfi Kırdar Kartal Training and Research Hospital, Plastic and Reconstructive Surgery, Istanbul,
5Yıldırım Beyazıt University, Atatürk Training and Research Hospital, Radiology, Ankara,
6National Magnetic Resonance Research Center , Ankara,
7Bilkent University, Aysel Sabuncu Brain Research Center, Ankara,
8Bahçeşehir University School of Medicine, Neurosurgery, Istanbul,
DOI: 10.5137/1019-5149.JTN.25595-18.2

Aim:Trauma and diabetes with concomitant vascular pathologies are leading causes of limb amputations. Functionality following amputation procedures is very important for social re-integration of the patients. In this study, we aimed to learn how rat primary somatosensory cortex (pSSC) responses to the loss of inputs from hind-paw, using fMRI of an inferior magnetic power (1.5 Tesla) with special designed high-powered rat coil. Material and Methods:Ten adult male Sprague-Dawley rats were enrolled in this study. The rats were anesthetized with ketamine injection. Xylazine was intraperitoneally injected for analgesia and muscle relaxation with careful maintenance of spontaneous respiration. Either right or left hind-paws were amputated under aseptic conditions according to predefined random allocation of the rats. A 12-channel rat surface coil developed for proper image resolution in 1.5 Tesla MR was used. Functional magnetic resonance imaging was obtained before hind-paw amputation; 2, 15 and 30 days after the amputation. Results:Activation signals were detected in 5 rats’ contralateral pSSC before the hind-paw amputation with regression and cessation of the signal after the amputation. Signal re-appeared in the contralateral pSSC of only one rat (rat 9) 30 days after the amputation. Conclusion:This study showed that functional plasticity might occur in the pSSC following hind-paw amputation of rats. Further studies are necessary to understand the true nature of the plasticity observed in pSSC, with new and novel measurement techniques on cellular basis rather than gross anatomical one.

Corresponding author : Murat Şakir Ekşi