Abstract
Craniosynostosis is a developmental disorder of the skull arising from premature bony fusion of cranial sutures, the sites of skull bone growth. In a recent gene microarray study, we demonstrated that retinol-binding protein 4 (RBP4) was the most highly downregulated gene in suture tissue during the pathological process of premature bony fusion. To gain insight into the function of RBP4 in cranial sutures, we analysed primary cells cultured from human cranial suture mesenchyme. These cells express RBP4 but not CRBP1, cellular retinol-binding protein 1, the typical cytoplasmic retinol storage protein. Using flow cytometry, we showed that suture mesenchymal cells express the RBP4 receptor, STRA6, on the cell surface. In a cell culture model of cranial osteogenesis, we found that RBP4 was significantly downregulated during mineralization, analogous to its decrease in pathological suture fusion. We found that cranial suture cells do not secrete detectable levels of RBP4, suggesting that it acts in a cell-autonomous manner. High-resolution confocal microscopy with a panel of antibody markers of cytoplasmic organelles demonstrated that RBP4 was present in several hundred cytoplasmic vesicles of about 300 nm in diameter which, in large part, were conspicuously distinct from the ER, the Golgi and endosomes of the endocytic pathway. We speculate that in suture mesenchymal cells, endogenous RBP4 receives retinol from STRA6 and the RBP4-retinol complex is stored in vesicles until needed for conversion to retinoic acid in the process of osteogenesis. This study extends the role of RBP4 beyond that of a serum transporter of retinol and implicates a broader role in osteogenesis.
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Abbreviations
- CANX:
-
Calnexin
- CRBP1:
-
Cellular retinol-binding protein 1
- EEA1:
-
Early endosomal antigen 1
- ER:
-
Endoplasmic reticulum
- FGFR:
-
Fibroblast growth factor receptor
- LAMP1:
-
Lysosome-associated membrane protein 1
- LRAT:
-
Lecithin retinol acyltransferase
- OG:
-
Osteogenic media
- RBP4:
-
Retinol-binding protein 4
- STRA6:
-
Stimulated by retinoic acid clone # 6
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Acknowledgments
Funding for this research was provided by NHMRC and the Australian Cranio-Maxillo Facial Foundation. Ms Leitch was supported by a scholarship from the University of Adelaide and Hansen Yuncken, Australian Rotary Health. Huh7 cells were a gift of Prof Eric Gowans, University of Adelaide, South Australia. We thank Dr Yeesim Khew-Goodall and Dr Leila Belle of the Centre for Cancer Biology, SA Pathology, Adelaide, for gifts of the EEA1, Rab9, Rab11 and LAMP1 antibodies. We thank Dr Randall Grose (Women’s and Children’s Health Research Institute) for assistance with flow cytometry and Dr Ghafar Sarvestani, Hanson Institute for Medical Research, SA Pathology, Adelaide, and Ms Hang Leong (Women’s and Children’s Health Research Institute) for assistance with confocal microscopy.
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V. D. Leitch and P. P. Dwivedi contributed equally.
P. J. Anderson and B. C. Powell are joint senior authors.
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Leitch, V.D., Dwivedi, P.P., Anderson, P.J. et al. Retinol-binding protein 4 downregulation during osteogenesis and its localization to non-endocytic vesicles in human cranial suture mesenchymal cells suggest a novel tissue function. Histochem Cell Biol 139, 75–87 (2013). https://doi.org/10.1007/s00418-012-1011-7
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DOI: https://doi.org/10.1007/s00418-012-1011-7