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    Thyroid hormone excess increases insulin-like growth factor I transcripts in bone marrow cell cultures: divergent effects on vertebral and femoral cell cultures

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    Authors
    Milne, Moira
    Kang, Moo-Il
    Quail, John M.
    Baran, Daniel T.
    UMass Chan Affiliations
    Department of Orthopedics and Physical Rehabilitation
    Document Type
    Journal Article
    Publication Date
    1998-05-16
    Keywords
    Alkaline Phosphatase
    Animals
    Bone Marrow Cells
    Cell Division
    Cells, Cultured
    Collagen
    Female
    Femur
    Gene Expression
    Insulin-Like Growth Factor I
    Osteoblasts
    Osteocalcin
    RNA, Messenger
    Rats
    Spine
    Time Factors
    Triiodothyronine
    Life Sciences
    Medicine and Health Sciences
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    Link to Full Text
    https://doi.org/10.1210/en.139.5.2527
    Abstract
    Thyroid hormones (T3 and T4) regulate bone development, growth, and turnover. Studies have suggested that different skeletal sites respond differently to thyroid hormones. Therefore, we examined the in vitro T3 responsiveness of cells committed to the osteoblast lineage as a function of skeletal location. Bone marrow cells derived from female rat femurs and vertebrae were cultured using conditions that induce osteogenic differentiation. Cells from both sites formed mineralized bone nodules in primary and secondary culture. In femoral cultures, collagen type I (coll I) and osteocalcin (OC) messenger RNA (mRNA) levels increased from the earliest time point examined (day 3) to a maximum on day 12 and thereafter declined to undetectable levels. T3 increased both OC and coll I mRNA, resulting in a continuous expression throughout the culture period. Insulin-like growth factor I (IGF-I) gene expression was detected at very low levels by Northern analysis of femoral total RNA, and T3 only marginally enhanced IGF-I mRNA levels. In vertebral cultures, OC and coll I mRNA levels also increased with time in culture, but remained expressed throughout the culture period. OC and coll I mRNA levels were not markedly altered in response to T3. In contrast to femoral cells, IGF-I gene expression was easily visualized in Northern blots from untreated vertebral cultures and was markedly increased by the addition of T3. The continuous presence of T3 (10(-7) M) in the medium for 18 days caused a marked decrease in the number of alkaline phosphatase-positive colonies formed in femoral secondary cultures, but only a slight decrease in the number in vertebral cultures. In addition, short term (6 days) exposure to T3 (10(-7) M) at the beginning of the culture period decreased alkaline phosphatase activity in femoral cultures, but not in vertebral cultures. These findings indicate that there are skeletal site-dependent differences in the in vitro responses of cells of the osteoblastic lineage to thyroid hormone.
    Source

    Endocrinology. 1998 May;139(5):2527-34.

    Permanent Link to this Item
    http://hdl.handle.net/20.500.14038/42149
    PubMed ID
    9564868
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