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Effects of gestational and breastfeeding caffeine exposure in adenosine A1 agonist‐induced antinociception of infant rats
Author(s) -
Torres Iraci L. S.,
Assumpção José A. F.,
Souza Andressa,
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.
Publication year - 2020
Publication title -
international journal of developmental neuroscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.761
H-Index - 88
eISSN - 1873-474X
pISSN - 0736-5748
DOI - 10.1002/jdn.10069
Subject(s) - caffeine , adenosine receptor , agonist , adenosine , adenosine receptor antagonist , lactation , gestation , endocrinology , medicine , pharmacology , receptor , pregnancy , biology , genetics
Objectives Caffeine is extensively consumed as a psychostimulant drug, acting on A 1 and A 2A 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 A 1 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. A 1 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 A 1 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.