Phenylketonuric (PKU) and epileptic mice show altered expression of NIPSNAP1 in the brain. Therefore, the distribution and localization of NIPSNAP1 in rat brain was determined. Results show that NIPSNAP1 is expressed exclusively in neurons including pyramidal neurons in the cerebral cortex, Purkinje neurons in the cerebellum and motor neurons in the spinal cord. Dopaminergic neurons in midbrain and noradrenergic Anti-diabetic Compound Library neurons in the brainstem, which are affected in PKU, also express NIPSNAP1. NIPSNAP1 is found to be localized in the mitochondrial matrix and can bind dihydrolipoyl-transacylase and -transacetylase components of the BCKA and pyruvate

dehydrogenase complexes in vitro. Our data provide the first experimental evidence for a strictly neuronal expression of this mitochondrial protein in the rat nervous system. “
“Temporal order memory (memory for stimulus order) is crucial for discrimination between familiar objects and depends upon a neural circuit involving the perirhinal cortex (PRH) and medial pre-frontal cortex. This study examined the role of glutamatergic and cholinergic neurotransmission in the encoding or retrieval of temporal order memory, using a task requiring the animals to discriminate between two familiar objects presented

at different intervals. 6-Cyano-7-nitroquinoxaline (CNQX) (AMPA/kainate receptor antagonist), scopolamine (muscarinic receptor antagonist) or 2-amino-5-phosphonopentanoic acid (AP5) (N-methyl-D-aspartate Doxorubicin receptor antagonist) was administered before sample phase 2 (to be active during encoding) or before test (to be active during retrieval). Unilateral CNQX administration into the PRH and pre-limbic/infra-limbic Monoiodotyrosine cortices (PL/IL) in opposite hemispheres, i.e. to disrupt neurotransmission within the circuit, impaired encoding and retrieval. Administration of scopolamine or AP5 in the PRH–PL/IL circuit impaired encoding. Drug effects in each brain region were then investigated

separately. Intra-PRH CNQX, scopolamine or AP5 disrupted encoding, such that the animals explored the recent object significantly more than the old object. In contrast, intra-PL/IL CNQX, scopolamine or AP5 impaired memory performance such that the animals spent an equal amount of time exploring the objects. CNQX but not AP5 or scopolamine impaired retrieval. Furthermore, CNQX impaired novel object preference when infused into the PRH but not PL/IL following a 3 h delay. Thus, encoding of temporal order memory is mediated by plastic processes involving N-methyl-D-aspartate and muscarinic receptors within the PRH–PL/IL circuit, but these two regions make qualitatively different cognitive contributions to the formation of this memory process.