The dopaminergic mesencephalic projections to the hippocampal formation in the rat

Gasbarri, Antonella; Sulli, Antonio; Packard, Mark G.

doi:10.1016/s0278-5846(96)00157-1

Cited by 256 publications

(192 citation statements)

References 68 publications

Supporting

Mentioning

176

Contrasting

Unclassified

Order By: Relevance

“…The rapid acquisition of bicuculline selfadministration in MORÀ/À mice demonstrate that these mutants have no learning deficit in our task, providing that they are efficiently reinforced with a non m-dependent pharmacological agent. Despite early reports that the hippocampus does not receive a significant DA innervation (Loy et al, 1980), projections from the VTA have been described in the stratum moleculare of the CA1 (Gasbarri et al, 1994(Gasbarri et al, , 1997Goldsmith and Joyce, 1994). Novel stimuli increase c-fos in the hippocampus (Jenkins et al, 2004).…”

Section: Discussionmentioning

confidence: 91%

Brain Regional Fos Expression Elicited by the Activation of μ- but not δ-Opioid Receptors of the Ventral Tegmental Area: Evidence for an Implication of the Ventral Thalamus in Opiate Reward

David

Matifas

Gavello-Baudy

et al. 2007

Neuropsychopharmacol

View full text Add to dashboard Cite

Both m-opioid receptors (MORs) and d-opioid receptors (DORs) are expressed in the ventral tegmental area (VTA) and are thought to be involved in the addictive properties of opiates. However, their respective contributions to opiate reward remain unclear. We used intracranial self-administration (ICSA) to study the rewarding effects of morphine microinjections into the VTA of male and female MORÀ/À and DORÀ/À mice. In brains of mice tested for intra-VTA morphine self-administration, we analyzed regional Fos protein expression to investigate the neural circuitry underlying this behavior. Male and female WT and DORÀ/À mice exhibited similar selfadministration performances, whereas knockout of the MOR gene abolished intra-VTA morphine self-administration at all doses tested. Naloxone (4 mg/kg) disrupted this behavior in WT and DOR mutants, without triggering physical signs of withdrawal. Morphine ICSA was associated with an increase in Fos within the nucleus accumbens, striatum, limbic cortices, amygdala, hippocampus, the lateral mammillary nucleus (LM), and the ventral posteromedial thalamus (VPM). This latter structure was found to express high levels of Fos exclusively in self-administering WT and DORÀ/À mice. Abolition of morphine reward in MORÀ/À mice was associated with a decrease in Fos-positive neurons in the mesocorticolimbic dopamine system, amygdala, hippocampus (CA1), LM, and a complete absence within the VPM. We conclude that (i) VTA MORs, but not DORs, are critical for morphine reward and (ii) the role of VTA-thalamic projections in opiate reward deserves to be further explored.

show abstract

Section: Discussionmentioning

confidence: 91%

Brain Regional Fos Expression Elicited by the Activation of μ- but not δ-Opioid Receptors of the Ventral Tegmental Area: Evidence for an Implication of the Ventral Thalamus in Opiate Reward

David

Matifas

Gavello-Baudy

et al. 2007

Neuropsychopharmacol

View full text Add to dashboard Cite

show abstract

“…With dense dopaminergic projections and the majority of DA receptors localized in the dendritic layers of CA1 associated with the pp input from layer III of EC (Goldsmith and Joyce, 1994;Gasbarri et al, 1997), it was reasoned that apomorphine may be acting on those receptors specifically. To substantiate that the observed behavioral impairments were due to the selective infusion of apomorphine into the CA1 subregion, in vivo recordings were performed.…”

Section: The Effect Of Apomorphine On Ec-ca1 Synaptic Transmissionmentioning

confidence: 99%

“…Recent studies suggest that the pp, but not the Schaffer collateral (SC) projection to CA1 is modulated by dopamine (DA) (Bruinink and Bischoff, 1993;Frey et al, 1993;Goldsmith and Joyce, 1994;Huang and Kandel, 1995;Gasbarri et al, 1997;Otmakhova and Lisman, 1999;Li et al, 2003). Thus, for the purpose of this series of experiments, we utilized pharmacological means of modifying the direct pp and driving the representation in CA1 towards processing trisynaptic inputs only.…”

Section: Introductionmentioning

confidence: 99%

The role of the direct perforant path input to the CA1 subregion of the dorsal hippocampus in memory retention and retrieval

2007

View full text Add to dashboard Cite

Subregional analyses of the hippocampus have suggested a selective role for the CA1 subregion in intermediate/long-term spatial memory and consolidation, but not short-term acquisition or encoding processes. It remains unclear how the direct cortical projection to CA1 via the perforant path (pp) contributes to these CA1-dependent processes. It has been suggested that dopamine selectively modulates the pp projection to CA1 while having little to no effect on the Schaffer collateral (SC) projection to CA1. This series of behavioral and electro-physiological experiments takes advantage of this pharmacological dissociation to demonstrate that the direct pp inputs to CA1 are critical in CA1-dependent intermediate-term retention and retrieval function. Here we demonstrate that local infusion of the nonselective dopamine agonist, apomorphine (10, 15 μg), into the CA1 subregion of awake animals produces impairments in between-day retention and retrieval, sparing within-day encoding of a modified Hebb-Williams maze and contextual conditioning of fear. In contrast, apomorphine produces no deficits when infused into the CA3 subregion. To complement the behavioral analyses, electrophysiological data was collected. In anesthetized animals, local infusion of the same doses of apomorphine significantly modifies evoked responses in the distal dendrites of CA1 following angular bundle stimulation, but produces no significant effects in the more proximal dendritic layer following stimulation of the SC. These results support a modulatory role for dopamine in the EC-CA1, but not CA3-CA1 circuitry, and suggest the possibility of a more fundamental role for EC-CA1 synaptic transmission in terms of intermediate-term, but not short-term spatial memory.

show abstract

“…Dopamine is supplied to the hippocampus by all midbrain dopaminergic nuclei (Gasbarri et al, 1994a(Gasbarri et al, ,1994b(Gasbarri et al, , 1996(Gasbarri et al, , 1997, but for simplicity this review will deal only with the ventral tegmental area (VTA), which was designated the A10 cell group. The VTA has long been thought to be involved with positive reinforcement on the basis of self-stimulation, reward, and drug addiction studies (Cooper, 1991;Shankaranarayana Rao et al, 1998).…”

Section: Properties Of Vta Cells That Supply Dopaminergic Input To Thmentioning

confidence: 99%

Storage, recall, and novelty detection of sequences by the hippocampus: Elaborating on the SOCRATIC model to account for normal and aberrant effects of dopamine

2001

View full text Add to dashboard Cite

ABSTRACT:In order to understand how the molecular or cellular defects that underlie a disease of the nervous system lead to the observable symptoms, it is necessary to develop a large-scale neural model. Such a model must specify how specific molecular processes contribute to neuronal function, how neurons contribute to network function, and how networks interact to produce behavior. This is a challenging undertaking, but some limited progress has been made in understanding the memory functions of the hippocampus with this degree of detail. There is increasing evidence that the hippocampus has a special role in the learning of sequences and the linkage of specific memories to context. In the first part of this paper, we review a model (the SOCRATIC model) that describes how the dentate and CA3 hippocampal regions could store and recall memory sequences in context. A major line of evidence for sequence recall is the "phase precession" of hippocampal place cells. In the second part of the paper, we review the evidence for theta-gamma phase coding. According to a framework that incorporates this form of coding, the phase precession is interpreted as cued recall of a discrete sequence of items from long-term memory. The third part of the paper deals with the issue of how the hippocampus could learn memory sequences. We show that if multiple items can be active within a theta cycle through the action of a short-term "buffer," NMDA-dependent plasticity can lead to the learning of sequences presented at realistic item separation intervals. The evidence for such a buffer function is reviewed. An important underlying issue is whether the hippocampal circuitry is configured differently for learning and recall. We argue that there are indeed separate states for learning and recall, but that both involve theta oscillations, albeit in possibly different forms. This raises the question of how neuromodulatory input might switch the hippocampus between learning and recall states and more generally how different neuromodulatory inputs reconfigure the hippocampus for different functions. In the fifth part of this paper we review our studies of dopamine and dopamine/NMDA interactions in the control of synaptic function. Our results show that dopamine dramatically reduces the direct cortical input to CA1 (the perforant path input), while having little effect on the input from CA3. In order to interpret the functional consequences of this pathway-specific modulation, it is necessary to understand the function of CA1 and the role of dopaminergic input from the ventral tegmental area (VTA). In the sixth part of this paper we consider several possibilities and address the issue of how dopamine hyperfunction or NMDA hypofunction, abnormalities that may underlie schizophrenia, might lead to the symptoms of the disease. Relevant to this issue is the demonstrated role of the hippocampus in novelty detection, a function that is likely to depend on sequence recall by the hippocampus. Novelty signals are generated when reality does not match ...

show abstract

The dopaminergic mesencephalic projections to the hippocampal formation in the rat

Cited by 256 publications

References 68 publications

Brain Regional Fos Expression Elicited by the Activation of μ- but not δ-Opioid Receptors of the Ventral Tegmental Area: Evidence for an Implication of the Ventral Thalamus in Opiate Reward

Brain Regional Fos Expression Elicited by the Activation of μ- but not δ-Opioid Receptors of the Ventral Tegmental Area: Evidence for an Implication of the Ventral Thalamus in Opiate Reward

The role of the direct perforant path input to the CA1 subregion of the dorsal hippocampus in memory retention and retrieval

Storage, recall, and novelty detection of sequences by the hippocampus: Elaborating on the SOCRATIC model to account for normal and aberrant effects of dopamine

Contact Info

Product

Resources

About