Effect of Streptozotocin-induced Diabetes on Performance on a Progressive Ratio Schedule

Overview

Journal Psychopharmacology (Berl)

Specialty Pharmacology

Date 2014 Jan 10

PMID 24402135

Citations 3

Authors

Lourdes Valencia-Torres

C M Bradshaw

Arturo Bouzas

Enrique Hong

Vladimir Orduna

Affiliations

Soon will be listed here.

Abstract

Rationale: It has been suggested that streptozotocin (STZ)-induced diabetes causes a motivational deficit in rodents. However, some of the evidence adduced in support of this suggestion may be interpreted in terms of a motor impairment rather than a motivational deficit.

Objective: This experiment examined the effect of STZ-induced diabetes on performance on a progressive ratio schedule. The data were analysed using a new model derived from Killeen's (Behav Brain Sci 17:105-172, 1994) Mathematical Principles of Reinforcement model which enables the effects of interventions on motivation or incentive value to be separated from effects on motor function.

Method: Animals were trained under a progressive ratio schedule using food-pellet reinforcement. Then they received a single intraperitoneal injection of 50 mg/kg of STZ or the vehicle. Training continued for 30 sessions after treatment. Running and overall response rates in successive ratios were analysed using the new model, and estimates of the model's parameters were compared between groups.

Results: The parameter expressing incentive value was reduced in the group treated with STZ, whereas the parameters expressing motor capacity and post-reinforcement pausing were not affected by the treatment. Blood glucose concentration was significantly elevated in the STZ-treated group compared to the vehicle-treated group.

Conclusions: The results are consistent with the suggestion that STZ-induced diabetes is associated with a reduction of the incentive value of food.

Citing Articles

Activation of Ventral Tegmental Area 5-HT Receptors Reduces Incentive Motivation.

Valencia-Torres L, Olarte-Sanchez C, Lyons D, Georgescu T, Greenwald-Yarnell M, Myers Jr M Neuropsychopharmacology. 2016; 42(7):1511-1521.

PMID: 27882999 PMC: 5362069. DOI: 10.1038/npp.2016.264.

Quantitative analysis of performance on a progressive-ratio schedule: effects of reinforcer type, food deprivation and acute treatment with Δ⁹-tetrahydrocannabinol (THC).

Olarte-Sanchez C, Valencia-Torres L, Cassaday H, Bradshaw C, Szabadi E Behav Processes. 2015; 113:122-31.

PMID: 25637881 PMC: 4534516. DOI: 10.1016/j.beproc.2015.01.014.

Evidence for a role of 5-HT2C receptors in the motor aspects of performance, but not the efficacy of food reinforcers, in a progressive ratio schedule.

Bezzina G, Body S, Cheung T, Hampson C, Bradshaw C, Glennon J Psychopharmacology (Berl). 2014; 232(4):699-711.

PMID: 25134499 DOI: 10.1007/s00213-014-3700-5.

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