Jeffery D. Radel

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The or(J) allele of the murine ocular retardation mutation is caused by a premature stop codon in the homeodomain of the Chx10 gene. When expressed on an inbred 129/Sv strain, the or(J) phenotype is characterized by microphthalmia and a thin, poorly differentiated retina in which the peripheral portion is affected to a greater extent than the central(More)
Docosahexaenoic acid (DHA) is a major component of neuronal membranes. In rats, low brain levels of DHA during development produce alterations in the mesocortical and mesolimbic dopamine systems. In this study, male Long-Evans rats (n = 6-7 per group) were raised from conception on diets with (control) or without alpha-linolenic acid, the dietary precursor(More)
Inadequate dietary n-3 polyunsaturated fatty acid (PUFA) content is associated with altered function of the CNS dopamine systems. In this study, the effects of dietary n-3 PUFA content were determined on dopamine cell number and morphology. Adult (postnatal day 70), male, Long-Evans rats were raised from conception on diets containing adequate (control) or(More)
Embryonic mouse retinae transplanted to a variety of locations within the rostral midbrain of neonatal rats exhibit selective innervation of host visual nuclei when studied at maturity. Some of these nuclei (superior colliculus, nucleus of the optic tract, dorsal terminal nucleus) usually receive extensive transplant projections, others are innervated(More)
The ultrastructure of regenerated optic fiber terminals differs from normal terminals during the first 12 months following optic nerve crush. The area of the regenerated terminals occupied by axoplasm initially increases (1 month postcrush, mpc), then declines to a below normal level (8-12 mpc) and eventually returns to the normal level (16 mpc). The(More)
We have investigated whether information relayed through intracranial retinal transplants can elicit responses in the visual cortex of host rats. Embryonic retinae were transplanted over the midbrain of neonatal rats. Four to eight weeks later, the transplants were exposed and stimulated with light flashes. This photic stimulation elicited both evoked(More)
It is generally assumed that proprioceptive feedback plays a crucial role in limb posture and movement. However, the role of afferent signals from extraocular muscles (EOM) in the control of eye movement has been a matter of continuous debate. These muscles have atypical sensory receptors in several species and it has been proposed that they are not(More)
BACKGROUND Low levels of n-3 polyunsaturated fatty acids (PUFAs), particularly docosahexaenoic acid (DHA, 22:6n3), are implicated in postpartum depression. METHODS The effects of pregnancy and lactation on brain phospholipid fatty acid content were determined in female rats fed diets containing sufficient (control) or negligible (deficient)(More)
Retinae transplanted over the midbrain of newborn rats establish functional connections with host brain centers, which provide a substrate for several distinct visual functions. These responses provide insight into the relationship between anatomy and behavior under normal conditions and after brain injury, as well as into the strategies used by an animal(More)
Pupilloconstriction to light can be mediated in rats through direct illumination of retinae previously transplanted to intracranial locations. Transplant-driven and normal pupillary light responses are stable under optimal testing conditions, and parameters describing the response can be quantified precisely. The present study demonstrates the interaction(More)