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MicroRNA-532-5p is implicated in the regulation of osteoporosis by forkhead box O1 and osteoblast differentiation

BMC Musculoskeletal Disorders volumeĀ 21, ArticleĀ number:Ā 296 (2020) Cite this article

Abstract

Background

MicroRNAs (miRNAs) are critical regulators in osteogenesis and cartilage formation. This study was designed to investigate whether miR-532-5p plays a role in the regulation of osteoporosis.

Methods

Osteoporotic fractures (OP group, nā€‰=ā€‰10) or osteoarthritis without osteoporosis (control group, nā€‰=ā€‰10) were selected as subjects in this study. Quantitative analysis of gene expression was performed by RT-PCR. Western blot was used to determine the expression levels of protein forkhead O1 (FOXO1). Bioinformatics analyses and luciferase reporter assay were used to verify the downstream target of miR-532-5p.

Results

Compared with the non-osteoporotic controls, miR-532-5p was upregulated in osteoporotic samples, and expression of miR-532-5p was downregulated in the osteogenic C2C12 cell model. Overexpression of miR-532-5p resulted in decreased expression levels of key osteoblast markers, including alkaline phosphatase (ALP), osteocalcin (OC), and collagen type I alpha 1 (COL1A1). The inhibitory results of miR-532-5p were reversed. MiR-532-5p contained a putative FOXO1 binding site. Moreover, miR-532-5p inhibited the expression of FOXO1, and overexpression of FOXO1 inhibited the effect of miR-532-5p on osteoblast markers.

Conclusions

MiR-532-5p can provide references to osteoporosis by regulating the expression of FOXO1 and osteoblast differentiation. MiR-532-5p might serve as a therapeutic target for osteoporosis.

Peer Review reports

Background

With the trends in population aging, the incidence of age-related diseases has increased, which requires more attention and resources to manage diseases associated with the elderly. Osteoporosis can lead to bone fragility [1]. One serious consequence of osteoporosis is the occurrence of osteoporotic fracture [2]. The pain and dysfunction caused by fracture significantly affect the quality of life of patients [3]. The prevalence rate of osteoporosis has increased significantly in recent years also due to the increased aging of the global population [4]. Therefore, it is of great social and economic value to study the pathological process of osteoporosis. Osteoporosis is mainly caused by insufficient differentiation of undifferentiated stem cells in the fascia scaffold into osteoblasts after bone tissue absorption [5].

Recent studies have found that miRNAs play critical roles in various pathological processes in the body, including cell apoptosis, biological growth, virus defense, hematopoietic processes, glycolipid metabolism, and disease development [6, 7]. They regulate the proliferation of osteoporosis and gene expression in bone tissue development, and ultimately affect the formation and metabolism of bones [8]. They are also critical regulators of signaling pathways involved in bone development and osteoblast proliferation in bone tissues [9]. MiR-532-5p is located on Xp11.23 of the human chromosome [10]. It was reported to have cancer-promoting effect in cutaneous melanoma [11]. Studies have found that it is down-regulated and can inhibit cell proliferation in a variety of solid diseases [12]. For example, the expression levels of miR-532-5p in rat osteoblasts were decreased after PTH treatment. MiR-532-5p plays a critical role in controlling bone remodeling by MMP-13 [13]. However, the role of miR-532-5p in osteoporosis is still unclear.

MiRNAs have been found to play their biological roles by regulating expression of target genes [14]. Forkhead box protein O (FOXO) is a broad-ranging transcription factor [15]. FOXO1 belongs to the FOX protein family. It regulates various pathophysiological processes such as cell differentiation, DNA damage repair, tumor metabolism, proliferation, and signal transduction [16]. Recent studies have found that the regulation of FOXO1 in bone varies with different cell types [17]. In osteoblasts, FOXO1 protein promotes protein synthesis by interacting with ATF4 to counteract oxidative stress in bone, maintaining normal proliferation of osteoblasts [18]. FOXO1 promotes the differentiation of osteoblast precursors into osteoblasts and may have an inhibitory effect on osteoclasts [18]. Studies have also found that overexpression of FOXO1 reduces the number of osteoblasts [19]. Collagen type I (COL1A1) is the main component of bone matrix and has the function of resisting deformation [20]. Alkaline phosphatase (ALP) is mainly expressed in hypertrophic chondrocytes and osteoblasts during intrachondral osteogenesis [21]. Osteocalcin (OC) is the most abundant collagen in bone. The content of osteocalcin can effectively reflect the activity of osteoblasts [22]. In the present study, the functions of miR-532-5p in the regulation of osteoporosis were studied and its interactions with FOXO1 were also investigated. This study will provide an experimental basis for the search for new drug targets.

Methods

Clinical samples

Ten postmenopausal women diagnosed with osteoarthritis without osteoporosis were enrolled in the control group (Supplementary TableĀ 1). Ten postmenopausal women who underwent hip replacement due to osteoporotic fractures (op) were enrolled in the experimental group. Samples of these participants were collected at the Wuhan General Hospital of Peopleā€™s Liberation Army from March 2018 to February 2019. None of the participants had a history of other disease including metabolic or endocrine disease, chronic renal failure, chronic liver disease, malignancies, Pagetā€™s disease of bone, malabsorption syndrome, hormone replacement therapy, anti-resorptive or anabolic agents, oral corticosteroids, anti-epileptic drugs, or treatment with lithium, heparin, or warfarin. This study was approved by the ethics committee of Wuhan General Hospital of Peopleā€™s Liberation Army. All participants signed the written informed consent.

Fragments of trabecular bone were obtained from osteoarthritic patients undergoing replacement knee surgery. The patients had no clinical symptoms of bone metabolic disorders. These bone samples were minced into 0.5ā€“1.0ā€‰cm2 pieces and were washed extensively in phosphate-buffered saline (PBS) to remove adherent bone marrow cells. The bone samples were homogenized in Trizol (Life Technologies) and total RNAs were extracted using the RNeasy kit (Lianshuo, Zhejiang, China). The concentrations of purified RNAs were measured using a spectrophotometer (Jinghua, Shanghai, China).

Cell culture, differentiation and transfection

C2C12 cells were cultured in DMEM/F12 complete medium containing 10% FBS and were kept in a cell incubator at 37ā€‰Ā°C with 5% CO2. Cells were treated with 2ā€‰nM BMP-2 (Invitrogen Life Technologies, CA, USA) to induce osteogenic differentiation. MiR-532-5p mimetic/inhibitor, mimetic (NC)/inhibitor control (NC inhibitor) and FOXO1-siRNA (si-FOXO1) (sc-35,382) were obtained from Santa Cruz Biotechnology, Inc. Oligonucleotides and plasmids were transfected with Lipofectamineā„¢ 2000 Transfection Reagent (Invitrogen, USA) for 48ā€‰h.

Quantitative polymerase chain reaction (qPCR)

Total RNAs of cells was extracted using TRIzol reagent (Haigene, Heilongjiang, China). qRT-PCR was performed using a ViiATM 7 real-time PCR system (Jinuo, Shanghai, China). GAPDH and U6 were used as internal references. The expression levels of lncRNA LINC00461 and miR-30a-5p were detected using SYBR Premix Ex Taq II (Takara Biotechnology). qRT-PCR were performed with reference to the literature [23]. Primer sequences were listed in Table 1.

Table 1 Sequences of primers used in qRT-PCR
Full size table

ALP staining and measurement

C2C12 cells were harvested, the culture medium was removed and ALP activity was measured using the ALP Colorimetric Assay Kit (Laier, Hefei,China).

Western blot

Total proteins were extracted and protein concentrations were quantified using the BCA Protein As-say Kit. Protein samples were incubated with rabbit anti-FOXO1 (1:500, Shidai, Shanghai, China) and GAPDH (1500, Shidai, Shanghai, China) for overnight, followed by incubation with anti-rabbit secondary antibody (1,5000) for 1ā€‰h. Western blot was performed with reference to the literature [24].

Luciferase reporter gene assay

Online software starBase (http://starbase.sysu.edu.cn/) was used to identify the target of miR-532-5p. The wild type FOXO1ā€“3ā€²-UTR (WT) and mutant FOXO1ā€“3ā€²-UTR (MT) vectors containing the putative binding site of miRNA-532-5p were constructed. A reporter vector containing WT or MT FOXO13ā€²-UTR was co-transfected into C2C12 cells with miR-345-5p mimic or NC using Lipofectamineā„¢ 2000. After 48ā€‰h of transfection, luciferase activity was assessed using a dual-luciferase assay system (Promega).

Statistical method

Data were analyzed by the SPSS19.0 statistical software. The results of data were shown as meanā€‰Ā±ā€‰standard deviation (SD). Comparisons among multiple groups were performed based on one-way ANOVA. LSD test was used for subsequent analysis. Pā€‰<ā€‰0.05 indicated significant differences.

Results

MiR-532-5p was down-regulated during osteogenic differentiation

As shown in Fig.Ā 1a, compared with the control group, the expression levels of miR-532-5p were significantly increased in OP patients (Pā€‰<ā€‰0.01), indicating that miR-532-5p plays a part in the progression of osteoporosis. As shown in Fig. 1b, the expression levels of osteoblast markers (OC, ALP and COL1A1) were significantly higher in BMP2-treated C2C12 cells (Pā€‰<ā€‰0.01), indicating successful induction of osteogenesis. As shown in Fig. 1c, in BMP2-treated C2C12 cells, the expression of miR-532-5p was significantly down-regulated (Pā€‰<ā€‰0.05, Pā€‰<ā€‰0.01). These results demonstrated that miR-532-5p was involved in the differentiation of osteogenic.

Fig. 1
figure 1

The levels of MiR-532-5p during OP and osteogenic differentiation. a The levels of miR-532-5p in osteoporotic fractures and control patients. b BMP2-induced levels of OC, ALP and COL1A1 in C2C12 cells. c BMP-2 treatment of cells for 0, 8, 16 and 24ā€‰h, after which the expression level of miR-532-5p was determined.** Pā€‰<ā€‰0.01

Full size image

Effects of miR-532-5p on osteoblast differentiation in C2C12 cells

As shown in Fig.Ā 2a, compared with the control group, the expression levels of miR-532-5p were significantly higher in the miR-532-5p mimic group. The expression levels of miR-532-5p were significantly decreased in the miR-532-5p inhibitor group (Pā€‰<ā€‰0.05), indicating successful transfection. And the expression levels of OC, ALP and COL1A1 in the miR-532-5p mimic group were significantly decreased, and the expression levels of OC, ALP and COL1A1 in the miR-532-5p inhibitor group were significantly higher (Pā€‰<ā€‰0.05) (Fig. 2b). ALP activity was significantly reduced in the miR-532-5p mimic group, and ALP activity was significantly increased in the miR-532-5p inhibitor group (Pā€‰<ā€‰0.05) (Fig. 2c). These results demonstrated that miR-532-5p can inhibit osteogenic differentiation.

Fig. 2
figure 2

MiR-532-5p inhibited osteogenic differentiation of C2C12 cells. a expression levels of miR-532-5p in C2C12 cells. b mRNA levels of OC, ALP and COL1A1 in C2C12 cells. c ALP activity in C2C12 cells. * Pā€‰<ā€‰0.05, ** Pā€‰<ā€‰0.01

Full size image

FOXO1 was a target of miR-532-5p

To identify the target genes of miR-532-5p in osteogenesis, the miRNA target prediction database starBase (http://starbase.sysu.edu.cn/) was used and FOXO1 was identified as a potential target for miR-532-5p (Fig.Ā 3a). As shown in Fig. 3b and c, the expression levels of FOXO1 protein were significantly decreased in the miR-532-5p mimic group compared to that in the NC group (Pā€‰<ā€‰0.01), while the expression levels of FOXO1 protein in the miR-532-5p inhibitor group were significantly increased (Pā€‰<ā€‰0.01). To validate these results, C2C12 cells were co-transfected with the miR-532-5p mimic and the wild-type (WT) or Mut (MT) 3ā€²-UTR containing FAXO1 and luciferase activity assay was performed. As shown in Fig. 3d, miR-532-5p significantly inhibited the activity of the FOXO1-WT reporter gene (Pā€‰<ā€‰0.01), but the activity of the mutant reporter gene was not affected (Pā€‰>ā€‰0.05). These data indicated that miR-532-5p may exert its biological functions through FOXO1.

Fig. 3
figure 3

FOXO1 was the target of miR-532-5p. a Putative target sequence of FOXO1 on the 3ā€²-UTR of miR-532-5p.(b) Protein expression level of FOXO1 in C2C12 cells. c Expression levels of FOXO1 in C2C12 cells. d Luciferase activity assay after co-transfection of C2C12 cells with a miR-532-5p mimetic and a reporter plasmid containing wild type (WT) or Mut (MT) 3ā€™-UTR of FOXO1. ** Pā€‰<ā€‰0.01

Full size image

MiR-532-5p inhibits osteogenic differentiation through FOXO1

The expression levels of FOXO1 protein in C2C12 cells after BMP-2 stimulation were then examined. The expression of FOXO1 was significantly upregulated in BMP2-treated C2C12 cells (Pā€‰<ā€‰0.01) (Fig.Ā 4a). In addition, the expression levels of osteoblast markers (OC, ALP, and COL1A1) were significantly raised in the miR-532-5p inhibitor group compared with that in the NC inhibitor group. Co-transfection with FOXO1 siRNA significantly reduced the expression levels of COL1A1, OC and ALP (Pā€‰<ā€‰0.01) (Fig. 4b). These results demonstrated that miR-532-5p inhibited osteogenic differentiation by down-regulating FOXO1.

Fig. 4
figure 4

MiR-532-5p inhibited osteogenic differentiation of C2C12 cells by targeting FOXO1. a BMP-2 induced FOXO1 protein expression levels in C2C12 cells. b Expression levels of OC, ALP and COL1A1 in C2C12 cells. * Pā€‰<ā€‰0.05, ** Pā€‰<ā€‰0.01

Full size image

Discussion

Osteoporosis (OP) is a systemic chronic metabolic disease, occurring mostly in postmenopausal women and the elderly [25]. In recent years, OP has become a worldwide problem that seriously jeopardizes public health, and its incidence has been ranked the first among middle-aged and elderly orthopedic diseases [26]. The main pathological characteristic of osteoporosis is inadequate bone formation during bone reconstruction [27]. The osteoblastic bone formation is an important core cell for maintaining normal bone metabolism. Therefore, osteoblasts are of great significance in patients with osteoporosis or other pathological osteoporosis.

Studies have shown that miRNAs participate in various important biological processes, including cell proliferation, differentiation, apoptosis and development [28]. It has been confirmed that many miRNAs play critical roles in bone metabolism [29]. The discovery of specific microRNAs and the underlying mechanisms of their regulation in bone metabolism involves important clinical issues, such as fracture treatment, disease of osteoporosis and osteoarthritis [30]. Recent studies found that miRNAs are also involved in the differentiation and development of osteoblasts [31]. For example, the expression of miR-346 was upregulated in the hBMSCs into osteoblasts, and it could bind to glycogen synthetic kinase 313 (GSK313) to regulate the Wnt/Ī²-catenin signaling pathway, which promoted the differentiation of osteoblasts [32]. It was reported that the expression level of miR-532-5p in osteoblasts was significantly reduced after 4ā€‰h [13]. Our study found that miR-532-5p was downregulated in OP patients was reduced. These indicated that miR-532-5p was involved in the progression of osteoporosis.

During the differentiation of osteoblast, various osteoblast-specific genes, such as COL1A1, ALP and OC, are expressed at different stages [33]. COL1A1 is secreted by osteoblasts and is the main organic component of bone matrix. It plays a part in biomechanical properties of bone structure. The expression of COL1A1 can be considered as a molecular marker for bone formation and bone remodeling [34]. ALP is a calcium-binding transporter mainly distributed in cell membrane, and its expression gradually increases with the degree of cell differentiation, which is an early indicator of osteoblast differentiation [35]. OC is a non-collagen protein that is specifically synthesized and secreted by osteoblasts. It is an essential factor for bone calcification [36]. This study found that in BMP2-treated C2C12 cells, the expression of miR-532-5p was downregulated. The expression levels of OC, ALP and COL1A1 and the ALP activity in the miR-532-5p mimic group were decreased compared with the control group, and the results in the miR-532-5p inhibitor group were opposite. These results demonstrated that miR-532-5p can inhibit osteogenic differentiation.

Studies have found that miRNAs affect the occurrence and development of diseases through regulation of different signaling pathways. FOXO1 plays important roles in many biological processes such as apoptosis, stress, DNA damage/repair, tumorigenesis, angiogenesis and glucose metabolism, and bone metabolism [37]. In the osteoblast cell line, FOXO1 regulates redox balance, protein synthesis, and osteogenic differentiation of cells through interactions with transcriptional activator 4 (ATF4), bone-specific transcription factor (Runx2) and ALP [38]. The FOXO1 in osteogenic differentiation has become a research hotspot. Recent studies found that protein accumulation of FOXO1 was decreased in BMMSCs of ovariectomized mice, which was caused by accumulation of tumor necrosis factor-alpha (TNF-Ī±) after estrogen deficiency. Mechanistically, TNF-Ī± activated NF-ĪŗB pathway to promote the expression of microRNA-705, which functions as a repressor of FOXO1 through post-transcriptional regulation. Inhibition of NF-ĪŗB pathway or knockdown of miR-705 largely prevented the decreasing of FOXO1-mediated antioxidant defense caused by TNF-Ī± and ameliorated the oxidative damage in osteoporotic BMMSCs [39]. This study found that expression of FOXO1 protein was significantly up-regulated in BMP2-treated C2C12 cells. FOXO1 may be a downstream target gene of miR-532-5p. In addition, co-transfection with FOXO1 siRNA in the miR-532-5p inhibitor group significantly reduced the expression levels of OC, ALP and COL1A1. These results demonstrated that miR-532-5p was able to suppress osteogenic differentiation by down-regulating the expression of FOXO1. Further investigations are needed to prove the value of miR-532-5p as a biomarker and a therapeutic target osteoporosis.

Conclusion

MiR-532-5p had a critical function in osteoporosis by regulating FOXO1 and osteoblast differentiation. It suggests that miR-532-5p can be a potential therapeutic target for osteoporosis. It would provide experimental evidence for the clinical prognosis of the disease and targeted intervention therapy.

Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

miRNAs:

MicroRNAs

ALP:

Alkaline phosphatase

OC:

Osteocalcin

COL1A1:

Collagen type I alpha 1

FOXO1:

Forkhead O1

qPCR:

Quantitative polymerase chain reaction

FOXO:

Forkhead box protein O

si-FOXO1:

FOXO1-siRNA

OP:

Osteoporosis

GSK313:

Glycogen synthetic kinase 313

ATF4:

Transcriptional activator 4

Runx2:

Bone-specific transcription factor

GSK313:

Glycogen synthetic kinase 313

TNF-Ī±:

Tumor necrosis factor-alpha

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Acknowledgements

Not applicable.

Funding

We received the financial support from Hubei provincial health and family planning commission general project (WJ2017M155).

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Authors and Affiliations

  1. Department of Orthopaedics, Guizhou Provincial Orthopaedic Hospital, Guiyang City, Guizhou Province, 550002, PR China

    Xinyu Guo

  2. Orthopedic surgery of Wuhan General Hospital of Peopleā€™s Liberation Army, No.627 Wuluo Road, Wuhan City, Hubei Province, 430000, PR China

    Shijun Wei,Ā Feng Xu,Ā Xianhua Cai,Ā Huasong WangĀ &Ā Ran Ding

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Contributions

XYG: analyzed and interpreted the patient data, experimental work and manuscript writing. SJW, FX, XHC and HSW: data analysis, experimental work and manuscript writing. RD: literature research, research design and manuscript editing. All authors read and approved the final manuscript.

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Correspondence to Ran Ding.

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Guo, X., Wei, S., Xu, F. et al. MicroRNA-532-5p is implicated in the regulation of osteoporosis by forkhead box O1 and osteoblast differentiation. BMC Musculoskelet Disord 21, 296 (2020). https://doi.org/10.1186/s12891-020-03317-y

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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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