Laboratory of Cytochemistry and Immunocytochemistry, Department of Biochemistry and Tissue Biology, Institute of Biology (IB), State University of Campinas (Unicamp), Campinas 13083-970, Brazil.
Laboratory of Immunometabolism, Department of Genetic, Evolution, Microbiology and Immunology, Institute of Biology (IB), State University of Campinas (Unicamp), Campinas 13083-970, Brazil.
Int J Mol Sci. 2023 Feb 26;24(5):4573. doi: 10.3390/ijms24054573.
Pregnancy and childbirth cause adaptations to the birth canal to allow for delivery and fast recovery. To accommodate delivery through the birth canal, the pubic symphysis undergoes changes that lead to the interpubic ligament (IpL) and enthesis formation in primiparous mice. However, successive deliveries influence joint recovery. We aimed to understand tissue morphology and chondrogenic and osteogenic potential at symphyseal enthesis during pregnancy and postpartum in primiparous and multiparous senescent female mice. Morphological and molecular differences were found at the symphyseal enthesis among the study groups. Despite the apparent incapacity to restore cartilage in multiparous senescent animals, the symphyseal enthesis cells are active. However, these cells have reduced expression of chondrogenic and osteogenic markers and are immersed in densely packed collagen fibers contiguous to the persistent IpL. These findings may indicate alterations of key molecules in the progenitor cell population maintenance of the chondrocytic and osteogenic lineages at the symphyseal enthesis in multiparous senescent animals, possibly compromising the mouse joint histoarchitecture recovery. This sheds light on the distention of the birth canal and the pelvic floor that may play a role in pubic symphysis diastasis (PSD) and pelvic organ prolapse (POP), both in orthopedic and urogynecological practice in women.
妊娠和分娩会导致产道发生适应性变化,以允许分娩和快速恢复。为了适应通过产道分娩,耻骨联合会发生变化,导致初产小鼠的耻骨联合韧带(IpL)和附着点形成。然而,多次分娩会影响关节的恢复。我们旨在了解初次生育和多次生育的衰老雌性小鼠妊娠和产后耻骨联合附着处的组织形态以及软骨和成骨潜能。研究组之间在耻骨联合附着处发现了形态和分子上的差异。尽管多产衰老动物的软骨似乎无法恢复,但耻骨联合附着处的细胞仍然活跃。然而,这些细胞表达软骨和成骨标志物的能力降低,并且被连续的 IpL 紧密包裹的胶原纤维所包围。这些发现可能表明,在多产衰老动物的耻骨联合附着处,软骨和成骨谱系祖细胞群体维持的关键分子发生了改变,可能会影响鼠关节组织形态的恢复。这提示了产道和骨盆底的扩张,这可能在耻骨联合分离(PSD)和盆腔器官脱垂(POP)中起作用,在骨科和妇科泌尿学实践中均有涉及。
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