Relationships between fetal body weight of Wistar rats at term and the extent of skeletal ossification
We investigated the relationship between fetal body weight at term (pregnancy day 21) and the extent of ossification of sternum, metacarpus, metatarsus, phalanges (proximal, medial and distal) of fore- and hindlimbs and cervical and coccygeal vertebrae in Wistar rats. The relationships between fetal...
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Associação Brasileira de Divulgação Científica
2005-04-01
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| Series: | Brazilian Journal of Medical and Biological Research |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000400010 |
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| author | I. Chahoud F.J.R. Paumgartten |
| author_facet | I. Chahoud F.J.R. Paumgartten |
| author_sort | I. Chahoud |
| collection | DOAJ |
| description | We investigated the relationship between fetal body weight at term (pregnancy day 21) and the extent of ossification of sternum, metacarpus, metatarsus, phalanges (proximal, medial and distal) of fore- and hindlimbs and cervical and coccygeal vertebrae in Wistar rats. The relationships between fetal body weight and sex, intrauterine position, uterine horn, horn size, and litter size were determined using historical control data (7594 fetuses; 769 litters) of untreated rats. Relationships between body weight and degree of ossification were examined in a subset of 1484 historical control fetuses (154 litters) which were subsequently cleared and stained with alizarin red S. Fetal weight was independent of horn size, uterine horn side (left or right) or intrauterine position. Males were heavier than females and fetal weight decreased with increasing litter size. Evaluation of the skeleton showed that ossification of sternum, metacarpus and metatarsus was extensively complete and independent of fetal weight on pregnancy day 21. In contrast, the extent of ossification of fore- and hindlimb phalanges and of cervical and sacrococcygeal vertebrae was dependent on fetal body weight. The strongest correlation between body weight and degree of ossification was found for hindlimb, medial and proximal phalanges. Our data therefore suggest that, in full-term rat fetuses (day 21), reduced ossification of sternum, metacarpus and metatarsus results from a localized impairment of bone calcification (i.e., a malformation or variation) rather than from general growth retardation and that ossification of hindlimb (medial and proximal) phalanges is a good indicator of treatment-induced fetal growth retardation. |
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| format | Article |
| id | doaj.art-2f2fc97634b34891ad44cced74196b93 |
| institution | Directory Open Access Journal |
| issn | 0100-879X 1414-431X |
| language | English |
| last_indexed | 2024-12-11T09:02:49Z |
| publishDate | 2005-04-01 |
| publisher | Associação Brasileira de Divulgação Científica |
| record_format | Article |
| series | Brazilian Journal of Medical and Biological Research |
| spelling | doaj.art-2f2fc97634b34891ad44cced74196b932022-12-22T01:13:43ZengAssociação Brasileira de Divulgação CientíficaBrazilian Journal of Medical and Biological Research0100-879X1414-431X2005-04-0138456557510.1590/S0100-879X2005000400010Relationships between fetal body weight of Wistar rats at term and the extent of skeletal ossificationI. ChahoudF.J.R. PaumgarttenWe investigated the relationship between fetal body weight at term (pregnancy day 21) and the extent of ossification of sternum, metacarpus, metatarsus, phalanges (proximal, medial and distal) of fore- and hindlimbs and cervical and coccygeal vertebrae in Wistar rats. The relationships between fetal body weight and sex, intrauterine position, uterine horn, horn size, and litter size were determined using historical control data (7594 fetuses; 769 litters) of untreated rats. Relationships between body weight and degree of ossification were examined in a subset of 1484 historical control fetuses (154 litters) which were subsequently cleared and stained with alizarin red S. Fetal weight was independent of horn size, uterine horn side (left or right) or intrauterine position. Males were heavier than females and fetal weight decreased with increasing litter size. Evaluation of the skeleton showed that ossification of sternum, metacarpus and metatarsus was extensively complete and independent of fetal weight on pregnancy day 21. In contrast, the extent of ossification of fore- and hindlimb phalanges and of cervical and sacrococcygeal vertebrae was dependent on fetal body weight. The strongest correlation between body weight and degree of ossification was found for hindlimb, medial and proximal phalanges. Our data therefore suggest that, in full-term rat fetuses (day 21), reduced ossification of sternum, metacarpus and metatarsus results from a localized impairment of bone calcification (i.e., a malformation or variation) rather than from general growth retardation and that ossification of hindlimb (medial and proximal) phalanges is a good indicator of treatment-induced fetal growth retardation.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000400010Ossification centersFetal skeletonDelayed fetal growthPrenatal growth retardationMalformationEmbryotoxicity |
| spellingShingle | I. Chahoud F.J.R. Paumgartten Relationships between fetal body weight of Wistar rats at term and the extent of skeletal ossification Brazilian Journal of Medical and Biological Research Ossification centers Fetal skeleton Delayed fetal growth Prenatal growth retardation Malformation Embryotoxicity |
| title | Relationships between fetal body weight of Wistar rats at term and the extent of skeletal ossification |
| title_full | Relationships between fetal body weight of Wistar rats at term and the extent of skeletal ossification |
| title_fullStr | Relationships between fetal body weight of Wistar rats at term and the extent of skeletal ossification |
| title_full_unstemmed | Relationships between fetal body weight of Wistar rats at term and the extent of skeletal ossification |
| title_short | Relationships between fetal body weight of Wistar rats at term and the extent of skeletal ossification |
| title_sort | relationships between fetal body weight of wistar rats at term and the extent of skeletal ossification |
| topic | Ossification centers Fetal skeleton Delayed fetal growth Prenatal growth retardation Malformation Embryotoxicity |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000400010 |
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