20.500.12556/RUL-122069 Bone tissue morphology of rat offspring lactationally exposed to polychlorinated biphenyl 169 and 155 Polychlorinated biphenyls (PCBs) are ubiquitous, persistent, organic pollutants also considered endocrine-disrupting chemicals. Our study examined the effects of lactational exposure to nondioxin-like PCB-155 and/or dioxin-like PCB-169 on longitudinal femur growth at the distal epiphyseal growth plate (EGP) in young rats at three different ages [postnatal days (PNDs) 9, 22, and 42]. After delivery, lactating rats were divided into four groups (PCB-169, PCB-155, PCB-155 + 169, and control) and administered PCBs intraperitoneally. The femurs of offspring were used to estimate growth rate (µm/day), and histomorphometric analysis on the distal femur included the thickness of the EGP and zones of proliferation and hypertrophy with calcification. Stereometry was used to determine trabecular bone volume density. In the PCB-169 and PCB-155 + 169 groups, PCB-169 affected longitudinal bone growth in the early postnatal period by interfering with chondrocytes in the EGP zone of proliferation and, to a lesser extent, the zone of hypertrophy. Morphometric alterations in EGP structure diminished until puberty. A slow growth rate persisted in the PCB-169 group until PND 42, while in the PCB-155 group, a fast growth rate between PNDs 9 to 22 was significantly reduced between PNDs 22 to 42. Sterometric assessment showed decreased trabecular bone volume in the PCB-155 + 169 group compared with that in the control on PND 9 and increased in the PCB-169 group compared with that in the PCB-155 group on PND 42. To summarize, studied PCB congeners exerted congener- and age-dependent effects on femur growth rate and its histomorphometric characteristics. environmental pollutants polychlorinated biphenyls bone morphology biochemistry rats bone histology true false true Angleški jezik Ni določen Članek v reviji 2020-11-19 13:25:21 2020-11-19 13:25:22 2023-03-25 03:35:54 0000-00-00 00:00:00 2020 0 0 9 str. art. 19016 Vol. 10 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 611 2045-2322 10.1038/s41598-020-76057-7 35769091 18727432 s41598-.pdf s41598-.pdf 1 EA64226E8F8F55697C58223A29BD40FC e04cd293767ac0f4edb62e38aa9ce51dede0059a3f6b1adf55977dd1cbe75ed7 4c3749e2-ca22-11ed-a314-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=167520 https://www.nature.com/articles/s41598-020-76057-7 0 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=137232 Veterinarska fakulteta Medicinska fakulteta 0 0 0