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Transplant-induced working memory deficits in hippocampectomized rats
M L Woodruff1, R H Baisden, R L Cannon
1Department of Anatomy, James H. Quillen College of Medicine, East Tennessee State University, Johnson City 37614-0582.
Physiology & Behavior
|September 1, 1993
Summary
Fetal hippocampus transplants impaired spatial learning in rats more than lesions alone. Rats with transplants showed deficits in maze tasks, suggesting potential negative effects of the grafts.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
- Neurobiology
Background:
- The hippocampus plays a crucial role in spatial learning and memory.
- Fetal tissue transplantation is a potential therapeutic strategy for neurological damage.
Purpose of the Study:
- To investigate the behavioral effects of fetal hippocampus transplantation in rats with existing hippocampal lesions.
- To compare the impact of transplantation versus lesions alone on spatial and non-spatial maze learning.
Main Methods:
- Male rats with hippocampal lesions underwent transplantation of fetal hippocampus tissue.
- Behavioral testing involved two versions of a radial arm maze: one relying on extramaze (spatial) cues and another on intramaze cues.
- Performance was assessed by the number of trials to reach criteria and the frequency of arm reentries.
Main Results:
- Transplanted rats required significantly more trials to achieve errorless trials in the spatial maze compared to controls.
- Rats with hippocampal lesions alone did not differ significantly from control groups in most measures.
- Transplanted rats exhibited increased repeat entries into both reinforced and non-baited arms, indicating impaired navigation and memory.
Conclusions:
- Fetal hippocampus transplantation can lead to greater behavioral impairments than hippocampal lesions alone in certain spatial learning tasks.
- The results question the efficacy of current fetal transplantation strategies for hippocampal damage, highlighting potential graft-induced deficits.