Effects of gestational and breastfeeding caffeine exposure in adenosine A1 agonist‐induced antinociception of infant rats. Issue 8 (20th October 2020)

• Record Type: Journal Article
• Authors: Torres, Iraci L. S.; Assumpção, José A. F.; de Souza, Andressa; de Oliveira, Carla; Adachi, Lauren N. S.; Scarabelot, Vanessa L.; Cioato, Stefania G.; Rozisky, Joanna R.; Caumo, Wolnei; Silva, Rosane S.; Battastini, Ana Maria O.; Medeiros, Liciane F.
• Is Part Of: International journal of developmental neuroscience. Issue 80:Issue 8(2020:Dec.)
• Page Start: 709
• Page End: 716
• Publication Date: 2020-10-20
• Subjects: caffeine -- ectonucleotidases -- nociception -- pregnancy -- Wistar rats; Developmental neurobiology -- Periodicals; Neurology -- Periodicals; Neurologie du développement -- Périodiques; Developmental neurobiology; Periodicals; 612.8
• DOI: 10.1002/jdn.10069
• Languages: English
• ISSNs: 0736-5748

Abstract

Abstract: Objectives: Caffeine is extensively consumed as a psychostimulant drug, acting on A1 and A2A adenosine receptors blockade. Chronic exposure to caffeine during gestation and breast‐feeding may be involved in infant rat's behavioral and biochemical alterations. Our goal was to evaluate the effect of chronic caffeine exposure during gestation and breast‐feeding in the functionality of adenosine A1 receptors in infant rats at P14. NTPDase and 5'‐nucleotidase activities were also evaluated. Methods: Mating of adult female Wistar rats was confirmed by presence of sperm in vaginal smears. Rats were divided into three groups on the first day of pregnancy: (1) control: tap water, (2) caffeine: 0.3 g/L until P14, and (3) washout caffeine: caffeine was changed to tap water at P7. Evaluation of nociceptive response was performed at P14 using hot plate (HP) and tail‐flick latency (TFL) tests. A1 receptor involvement was assessed using caffeine agonist (CPA) and antagonist (DPCPX). Enzymatic activities assays were conducted in the spinal cord. Results: Gestational and breastfeeding exposure to caffeine (caffeine and washout groups) did not induce significant alterations in thermal nociceptive thresholds (HP and TF tests). Both caffeine groups did not show analgesic response induced by CPA when compared to the control group at P14, indicating chronic exposure to caffeine in the aforementioned periods inhibits the antinociceptive effects of the systemic A1 receptor agonist administration. No effect was observed upon ectonucleotidase activities. Conclusions: Our results demonstrate that chronic caffeine exposure in gestational and breastfeeding alters A1‐mediated analgesic response in rats. Abstract : Chronic caffeine exposure in the gestational and breastfeeding periods reduces the antinociceptive effects of a selective adenosine A1 receptor agonist (CPA) in infant rats Caffeine exposure in early life changes the characteristic adenosinergic antinociceptive response Caffeine exposure in the gestational and breastfeeding periods does not alter the basal thermal nociceptive threshold and nucleotidase activities in synaptosomes from the spinal cord of infant rats