title: Effects on secretory IgA levels in small intestine of mice that underwent moderate exercise training followed by a bout of strenuous swimming exercise.
abstract: Intestinal homeostasis effectors, secretory IgA (SIgA) and polymeric immunoglobulin receptor (pIgR), have been evaluated in proximal and distal small intestine with moderate-exercise training but not with strenuous exercise or a combination of these two protocols. Therefore, two groups of mice (n=6-8) were submitted to strenuous exercise, one with and one without previous training. The control group had no exercise protocol. Assessment was made of intestinal SIgA and plasma adrenal hormones (by immunoenzymatic assay), alpha-chain and pIgR proteins in intestinal mucosa (by Western blot), lamina propria IgA plasma-cells (by cytofluorometry), mRNA expression (by real-time PCR) for pIgR, alpha- and J-chains in liver and intestinal mucosa, and pro- and anti-inflammatory cytokines in mucosa samples. Compared to other exercise protocols, training plus strenuous exercise elicited: (1) higher levels of SIgA and pIgR in the proximal intestine (probably by hepatobiliary contribution); (2) higher levels of SIgA in the distal segment; (3) lower mRNA expression of some SIgA- and most pro-inflammatory pIgR-producing cytokines. SIgA and pIgR in both segments were derived from an existing pool of their corresponding producing cells. The apparent decreased translation of mRNA transcripts underlies lower levels of SIgA and pIgR in distal than proximal small intestine. There was no significant difference in the relatively high adrenal hormone levels found in both exercised groups. Further study is required about the effects of training plus strenuous exercise on pool-derived SIgA levels and mRNA expression of pro-inflammatory pIgR-producing cytokines. These results could have important implications for intestinal disorders involving inflammation and infection.
authors.affiliation: Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Plan de San Luis y Díaz Mirón s/n, Col. Santo Tomas, CP 11340 México, D.F., Mexico.
authors.forename: Marycarmen
authors.initials: M
authors.lastname: Godínez-Victoria
authors.forename: Ma Elisa
authors.initials: ME
authors.lastname: Drago-Serrano
authors.forename: Humberto
authors.initials: H
authors.lastname: Reyna-Garfias
authors.forename: Maria
authors.initials: M
authors.lastname: Viloria
authors.forename: Eleazar
authors.initials: E
authors.lastname: Lara-Padilla
authors.forename: Aldo A
authors.initials: AA
authors.lastname: Resendiz-Albor
authors.forename: Luvia E
authors.initials: LE
authors.lastname: Sánchez-Torres
authors.forename: Teresita R
authors.initials: TR
authors.lastname: Cruz-Hernández
authors.forename: Rafael
authors.initials: R
authors.lastname: Campos-Rodriguez
mesh_terms: D000818:Animals; D016207:Cytokines / Q000276:immunology; D007071:Immunoglobulin A, Secretory / Q000276:immunology*; D007421:Intestine, Small / Q000276:immunology*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D012333:RNA, Messenger / Q000378:metabolism; D019056:Receptors, Polymeric Immunoglobulin / Q000276:immunology*; D013550:Swimming
chemical_list: D016207:Cytokines; D007071:Immunoglobulin A, Secretory; D012333:RNA, Messenger; D019056:Receptors, Polymeric Immunoglobulin