Emergence of hormonal and redox regulation of galectin-1 in placental mammals: Implication in maternal-fetal immune tolerance

Galectin-1 is an anti-inflammatory lectin with pleiotropic regulatory functions at the crossroads of innate and adaptive immunity. It is expressed in immune privileged sites and is implicated in establishing maternal-fetal immune tolerance, which is essential for successful pregnancy in eutherian ma...

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Veröffentlicht in:Proceedings of the National Academy of Sciences - PNAS 2008-10, Vol.105 (41), p.15819-15824
Hauptverfasser: Than, Nandor Gabor, Romero, Roberto, Erez, Offer, Weckle, Amy, Tarca, Adi L, Hotra, John, Abbas, Asad, Han, Yu Mi, Kim, Sung-Su, Kusanovic, Juan Pedro, Gotsch, Francesca, Hou, Zhuocheng, Santolaya-Forgas, Joaquin, Benirschke, Kurt, Papp, Zoltan, Grossman, Lawrence I, Goodman, Morris, Wildman, Derek E
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container_end_page 15824
container_issue 41
container_start_page 15819
container_title Proceedings of the National Academy of Sciences - PNAS
container_volume 105
creator Than, Nandor Gabor
Romero, Roberto
Erez, Offer
Weckle, Amy
Tarca, Adi L
Hotra, John
Abbas, Asad
Han, Yu Mi
Kim, Sung-Su
Kusanovic, Juan Pedro
Gotsch, Francesca
Hou, Zhuocheng
Santolaya-Forgas, Joaquin
Benirschke, Kurt
Papp, Zoltan
Grossman, Lawrence I
Goodman, Morris
Wildman, Derek E
description Galectin-1 is an anti-inflammatory lectin with pleiotropic regulatory functions at the crossroads of innate and adaptive immunity. It is expressed in immune privileged sites and is implicated in establishing maternal-fetal immune tolerance, which is essential for successful pregnancy in eutherian mammals. Here, we show conserved placental localization of galectin-1 in primates and its predominant expression in maternal decidua. Phylogenetic footprinting and shadowing unveil conserved cis motifs, including an estrogen responsive element in the 5' promoter of LGALS1, that were gained during the emergence of placental mammals and could account for sex steroid regulation of LGALS1 expression, thus providing additional evidence for the role of galectin-1 in immune-endocrine cross-talk. Maximum parsimony and maximum likelihood analyses of 27 publicly available vertebrate and seven newly sequenced primate LGALS1 coding sequences reveal that intense purifying selection has been acting on residues in the carbohydrate recognition domain and dimerization interface that are involved in immune functions. Parsimony- and codon model-based phylogenetic analysis of coding sequences show that amino acid replacements occurred in early mammalian evolution on key residues, including gain of cysteines, which regulate immune functions by redox status-mediated conformational changes that disable sugar binding and dimerization, and that the acquired immunoregulatory functions of galectin-1 then became highly conserved in eutherian lineages, suggesting the emergence of hormonal and redox regulation of galectin-1 in placental mammals may be implicated in maternal-fetal immune tolerance.
doi_str_mv 10.1073/pnas.0807606105
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subjects Amino acids
Animals
Biological Evolution
Biological Sciences
Cells
Computational Biology
Databases, Nucleic Acid
Dimerization
Evolution
Female
Galectin 1 - genetics
Galectin 1 - metabolism
Gene expression
Gene Expression Regulation - immunology
Gene Expression Regulation - physiology
Genetics
Gonadal Steroid Hormones - physiology
Hormones
Humans
Immune Tolerance
Immunology
Mammals
Maternal-Fetal Exchange - immunology
Molecular Sequence Data
Oxidation-Reduction
Phylogenetics
Phylogeny
Placenta
Placenta - metabolism
Pregnancy
Primates
T lymphocytes
Vertebrates
title Emergence of hormonal and redox regulation of galectin-1 in placental mammals: Implication in maternal-fetal immune tolerance
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