Orinoquia

Efeito do estresse pré-natal na regulação da inflamação alérgica pulmonar no modelo murino de asma experimental

Vagner Gonçalves Jr, Ana Paula Ligeiro de Oliveira, Karin Kieling

Resumen


Devido ao seu rápido crescimento, o feto é particularmente vulnerável a insultos e modificações no millieu hormonal. Este fato sugere que situações adversas experimentadas pela mãe grávida podem alterar o desenvolvimento e a saúde da prole, explicado principalmente pela permeabilidade da barreira placentária a diversos hormônios e substâncias. O objetivo deste trabalho foi estudar o efeito do estresse pré-natal na regulação da inflamação alérgica pulmonar, empregando o modelo murino de asma experimental. Para este propósito foram utilizadas camundongas virgens da linhagem Swiss, com 50 dias de idade. Foi empregado o modelo de choque nas patas para promover o estresse pré-natal e o modelo do “metrô de Nova Efeito do estresse pré-natal na regulação da inflamação alérgica pulmonar no modelo murino de asma experimental 65 Iorque” para o estresse pós-natal. As fêmeas foram distribuídas em 4 grupos experimentais: CC: fêmeas não estressadas;
CE: fêmeas estressadas pós-natalmente aos 60 dias de idade (PND60), EC: fêmeas nascidas de mães estressadas entre o dia 15 (GD15) e 18 de gestação (GD18); EE: fêmeas nascidas de mães estressadas entre o GD15 e GD18 e estressadas pós-natalmente aos PND60. A indução da inflamação alérgica pulmonar foi realizada através da sensibilização dos animais com solução de ovalbumina (OVA) 0,1 mg.Kg-1 sc para avaliação do leucograma, lavado broncoalveolar (BAL), celularidade hematopoiética medular e neuroquímica. Os experimentos foram realizados 24h após a última sessão de nebulização.
O número de células do BAL foi significantemente maior nos animais do grupo EE, em relação àqueles dos grupos CC (P<0.01), CE (P<0.01) e EC (P<0.001). Na contagem diferencial do BAL os linfócitos e macrófagos do grupo EE foram significantemente maiores que em os outros grupos avaliados (P<0.05). Na contagem diferencial de células no sangue não foram observadas alterações (P>0.05) para os linfócitos, neutrófilos, eosinófilos e monócitos; porém, observou-se diferenças significativas (P<0.05) entre o número de bastonetes dos grupos, sendo maior nos animais do grupo CC em relação àqueles
do grupo EC. O número de células hematopoiéticas da medula óssea foi significantemente (P<0.05) menor nos animais do grupo EE, em relação àqueles do grupo CC. No córtex pré-frontal, há diferenças significantes na relação Ácido Homovanílico/Dopamina (HVA/DA) (P<0.05), sendo maior nos animais do grupo EC, em relação àqueles do grupo CE. Em conclusão,
o estresse pré-natal levou a modulação de células do sistema imune (SI) dos neonatos, evidenciado após a exposição a estresse agudo pós-natal, amplificando a resposta alérgica pulmonar. Sugere-se que a maior susceptibilidade dos animais do grupo EE seja consequência de alterações induzidas pelo estresse pré-natal no eixo hipotálamo-pituitária-adrenal (HPA).


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DOI: http://dx.doi.org/10.22579/20112629.364

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