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- Ohlsson, Claes,1965Gothenburg University,Göteborgs universitet,Institutionen för invärtesmedicin,Institute of Internal Medicine (author)
Effects of tri-iodothyronine and insulin-like growth factor-I (IGF-I) on alkaline phosphatase activity, [3H]thymidine incorporation and IGF-I receptor mRNA in cultured rat epiphyseal chondrocytes.
- Article/chapterEnglish1992
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- 1992
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- LIBRIS-ID:oai:gup.ub.gu.se/91652
- https://gup.ub.gu.se/publication/91652URI
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- Language:English
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- The effects of tri-iodothyronine (T3) and insulin-like growth factor-I (IGF-I) on [3H]thymidine incorporation, alkaline phosphatase (ALP) activity and IGF-I receptor mRNA levels were studied in rat epiphyseal chondrocytes cultured in monolayer. Chondrocytes from enzymatically digested rat tibia epiphyseal growth plates were seeded in monolayer culture and precultured for 7-14 days in Ham's F-12 medium supplemented with 10% (v/v) newborn calf serum and 1% (v/v) of a serum substitute. After preculture the medium was changed to Ham's F-12 medium containing 1% (v/v) serum from hypophysectomized rats, and the effects of T3 and/or IGF-I on DNA synthesis ([3H]thymidine incorporation), ALP activity (a late marker of differentiated epiphyseal chondrocytes) and IGF-I receptor mRNA levels were studied. ALP activity was increased by T3 in a dose-dependent manner with a maximal response at 10 micrograms T3/l (678 +/- 86% compared with control culture). The increase in ALP activity was accompanied by a concomitant decrease in [3H]thymidine incorporation (52 +/- 14% compared with control culture). Human GH (hGH; 50 micrograms/l) and IGF-I (25 micrograms/l) had no stimulatory effect on ALP activity. However IGF-I (10 micrograms/l) exerted an inhibition on the T3 (10 micrograms/l)-induced increase in ALP activity (64 +/- 9% compared with T3-treated culture). T3 (3 micrograms/l) inhibited the increase in [3H]thymidine incorporation caused by 25 micrograms IGF-I/l (51 +/- 13% compared with IGF-I-treated culture). Furthermore, IGF-I receptor mRNA levels were increased by 10 micrograms T3/l (137 +/- 4.2% compared with control culture) while no effect of hGH (50 micrograms/l) or IGF-I (25 micrograms/l) was demonstrated. Both T3 and IGF-I were shown to interact with epiphyseal chondrocytes and both substances seemed to affect cell proliferation and maturation and therefore longitudinal bone growth. Furthermore, the results indicated that IGF-I is important for proliferation of the cells while T3 initiates the terminal differentiation of epiphyseal chondrocytes.
Subject headings and genre
- Alkaline Phosphatase
- metabolism
- Animals
- Cell Differentiation
- drug effects
- Cell Division
- drug effects
- Cells
- Cultured
- Growth Plate
- cytology
- drug effects
- metabolism
- Insulin-Like Growth Factor I
- pharmacology
- Male
- RNA
- Messenger
- analysis
- Rats
- Rats
- Sprague-Dawley
- Receptor
- IGF Type 1
- genetics
- Thymidine
- metabolism
- Triiodothyronine
- pharmacology
Added entries (persons, corporate bodies, meetings, titles ...)
- Nilsson, Anders,1958Gothenburg University,Göteborgs universitet,Institutionen för de kirurgiska disciplinerna, Avdelningen för ortopedi,Institute of Surgical Sciences, Department of Orthopaedics(Swepub:gu)xniand (author)
- Isaksson, Olle,1943Gothenburg University,Göteborgs universitet,Institutionen för invärtesmedicin,Institute of Internal Medicine(Swepub:gu)xisaol (author)
- Bentham, J (author)
- Lindahl, Anders,1954Gothenburg University,Göteborgs universitet,Institutionen för laboratoriemedicin, Avdelningen för klinisk kemi/transfusionsmedicin,Institute of Laboratory Medicine, Dept of Clinical Chemistry/Transfusion Medicine(Swepub:gu)xlandy (author)
- Göteborgs universitetInstitutionen för invärtesmedicin (creator_code:org_t)
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- In:The Journal of endocrinology135:1, s. 115-230022-0795
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