In vivo laser speckle contrast imaging of 4-aminopyridine- or pentylenetetrazole-induced seizures

Author:

Wang Yuhling12ORCID,Tsytsarev Vassiliy3ORCID,Liao Lun-De1ORCID

Affiliation:

1. Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes 1 , No. 35, Keyan Rd., Zhunan Township, Miaoli County 350, Taiwan

2. Department of Electrical Engineering, National United University, No. 2, Lien Da, Nan Shih Li 2 , Miaoli City 36063, Taiwan

3. Department of Anatomy and Neurobiology, University of Maryland School of Medicine 3 , 20 Penn Street, HSF-2, Baltimore, Maryland 21201, USA

Abstract

Clinical and preclinical studies on epileptic seizures are closely linked to the study of neurovascular coupling. Obtaining reliable information about cerebral blood flow (CBF) in the area of epileptic activity through minimally invasive techniques is crucial for research in this field. In our studies, we used laser speckle contrast imaging (LSCI) to gather information about the local blood circulation in the area of epileptic activity. We used two models of epileptic seizures: one based on 4-aminopyridine (4-AP) and another based on pentylenetetrazole (PTZ). We verified the duration of an epileptic seizure using electrocorticography (ECoG). We applied the antiepileptic drug topiramate (TPM) to both models, but its effect was different in each case. However, in both models, TPM had an effect on neurovascular coupling in the area of epileptic activity, as shown by both LSCI and ECoG data. We demonstrated that TPM significantly reduced the amplitude of 4-AP-induced epileptic seizures (4-AP+TPM: 0.61 ± 0.13 mV vs 4-AP: 1.08 ± 0.19 mV; p < 0.05), and it also reduced gamma power in ECoG in PTZ-induced epileptic seizures (PTZ+TPM: 38.5% ± 11.9% of the peak value vs PTZ: 59.2% ± 3.0% of peak value; p < 0.05). We also captured the pattern of CBF changes during focal epileptic seizures induced by 4-AP. Our data confirm that the system of simultaneous cortical LSCI and registration of ECoG makes it possible to evaluate the effectiveness of pharmacological agents in various types of epileptic seizures in in vivo models and provides spatial and temporal information on the process of ictogenesis.

Funder

National Science and Technology Council

National Health Research Institutes

Ministry of Health and Welfare

Publisher

AIP Publishing

Subject

Biomedical Engineering,Biomaterials,Biophysics,Bioengineering

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