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Palmier M, Maître M, Doat H, Lesté-Lasserre T, Maurel DB, Boiziau C. Osteocyte gene expression analysis in mouse bone: optimization of a laser-assisted microdissection protocol. JBMR Plus 2024; 8:ziae078. [PMID: 39045129 PMCID: PMC11264292 DOI: 10.1093/jbmrpl/ziae078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 05/29/2024] [Accepted: 06/21/2024] [Indexed: 07/25/2024] Open
Abstract
Among bone cells, osteocytes are the most abundant, but also the most challenging to study because they are located inside a dense mineralized matrix. Due to their involvement in bone homeostasis, diverse tools are needed to understand their roles in bone physiology and pathology. This work was aimed at establishing a laser-assisted microdissection protocol to isolate osteocytes and analyze their gene expressions. The goal was to overcome the limitations of the technique currently most used: RNA extraction from the whole bone. To perform laser microdissection and subsequent gene expression analysis, the five main steps of the protocol have been adapted for the bone tissue. After testing many parameters, we found that the best options were (1) take unfixed snap-frozen tissue, (2) cryosection with a supported tape system to improve the tissue morphology if necessary, (3) microdissect regions of interest, and (4) recover the bone pieces by catapulting, if feasible, or by gravity. Finally, RNA extraction (5) was the most efficient with a precipitation method and allowed quantifying the expression of well described osteocyte genes (Gja1/Cx43, Phex, Pdpn, Dmp1, Sost). This work describes two protocols optimized for femur and calvaria and gives an overview of the many optimization options that one could try when facing difficulties with laser microdissection.
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Affiliation(s)
- Mathilde Palmier
- Inserm, University of Bordeaux, BioTis Laboratory UMR 1026, Bordeaux, France
| | - Marlène Maître
- Inserm, University of Bordeaux, Neurocentre Magendie UMR 1215, Bordeaux, France
| | - Hélène Doat
- Inserm, University of Bordeaux, Neurocentre Magendie UMR 1215, Bordeaux, France
| | | | - Delphine B Maurel
- Inserm, University of Bordeaux, BioTis Laboratory UMR 1026, Bordeaux, France
| | - Claudine Boiziau
- Inserm, University of Bordeaux, BioTis Laboratory UMR 1026, Bordeaux, France
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Wang W, Zhou C, Feng Z, Li H, Zhang Y, Bao B, Cai B, Chen M, Huang H. PLGA-based control release of Noggin blocks the premature fusion of cranial sutures caused by retinoic acid. Appl Microbiol Biotechnol 2018; 103:291-301. [PMID: 30392121 PMCID: PMC6311184 DOI: 10.1007/s00253-018-9457-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 09/29/2018] [Accepted: 10/09/2018] [Indexed: 12/15/2022]
Abstract
Craniosynostosis (CS), the premature and pathological fusion of cranial sutures, is a relatively common developmental disorder. Elucidation of the pathways involved and thus therapeutically targeting it would be promising for the prevention of CS. In the present study, we examined the role of BMP pathway in the all-trans retinoic acid (atRA)-induced CS model and tried to target the pathway in vivo via PLGA-based control release. As expected, the posterior frontal suture was found to fuse prematurely in the atRA subcutaneous injection mouse model. Further mechanism study revealed that atRA could repress the proliferation while promote the osteogenic differentiation of suture-derived mesenchymal cells (SMCs). Moreover, BMP signal pathway was found to be activated by atRA, as seen from increased expression of BMPR-2 and pSMAD1/5/9. Recombinant mouse Noggin blocked the atRA-induced enhancement of osteogenesis of SMCs in vitro. In vivo, PLGA microsphere encapsulated with Noggin significantly prevented the atRA-induced suture fusion. Collectively, these data support the hypothesis that BMP signaling is involved in retinoic acid-induced premature fusion of cranial sutures, while PLGA microsphere-based control release of Noggin emerges as a promising strategy for prevention of atRA-induced suture fusion.
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Affiliation(s)
- Weicai Wang
- Guanghua School of Stomatology, Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, 56 Lingyuanxi Road, Guangzhou, China
| | - Chen Zhou
- Guanghua School of Stomatology, Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, 56 Lingyuanxi Road, Guangzhou, China
| | - Zhicai Feng
- Guanghua School of Stomatology, Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, 56 Lingyuanxi Road, Guangzhou, China
| | - Hongyu Li
- Guanghua School of Stomatology, Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, 56 Lingyuanxi Road, Guangzhou, China
| | - Yadong Zhang
- Guanghua School of Stomatology, Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, 56 Lingyuanxi Road, Guangzhou, China
| | - Baicheng Bao
- Guanghua School of Stomatology, Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, 56 Lingyuanxi Road, Guangzhou, China
| | - Bin Cai
- Guanghua School of Stomatology, Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, 56 Lingyuanxi Road, Guangzhou, China
| | - Mu Chen
- Department of Stomatology, Shenzhen Nanshan People's Hospital and The 6th Affiliated Hospital of Shenzhen University Health Science Center, 89 Taoyuan Road, Shenzhen, China.
| | - Hongzhang Huang
- Guanghua School of Stomatology, Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, 56 Lingyuanxi Road, Guangzhou, China.
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