CN105200137A

CN105200137A - CERS2 (ceramide synthase 2) gene and its expression product serving as treatment target of osteoporosis

Info

Publication number: CN105200137A
Application number: CN201510629348.1A
Authority: CN
Inventors: 李曙光; 杨承刚
Original assignee: Beijing Medintell Bioinformatic Technology Co Ltd
Current assignee: Qingdao Yangshen Biomedical Co Ltd
Priority date: 2015-09-28
Filing date: 2015-09-28
Publication date: 2015-12-30
Anticipated expiration: 2035-09-28
Also published as: CN105200137B

Abstract

The invention discloses a CERS2 (ceramide synthase 2) gene and its expression product serving as a molecular marker for treating osteoporosis. Judgment may be given to whether a patient with osteoporosis or a treatment subject has the risk of suffering from osteoporosis, by detecting CERS2 gene and its expression product contents of bone tissues. The study on proliferation of osteoblasts cultured in vitro discovers that the expression inhibition of the CERS2 gene may promote the proliferation of the osteoblasts and that the proliferation of the osteoblasts may also be promoted by inhibiting the function of CERS2 proteins, and results of the study show that the CERS2 gene and its expression product are potential drug targets for treating osteoporosis.

Description

CERS2 gene and expression product thereof are as the diagnosis and treatment target of osteoporosis

Technical field

The present invention relates to biological technical field, relate to the purposes of CERS2 gene in the diagnosis, treatment of osteoporosis particularly.

Background technology

Osteoporosis (osteoporosis) is a kind of systemic osteopathy, it is characterized in that bone amount declines and the microtexture of bone destroys, the fragility showing as bone increases, and the danger of thus fracturing greatly increases, even also easily fracture in slight wound or atraumatic situation.Usually there is vertebral compression fracture unconsciously, also can bring out vertebral fracture because of cough, sneeze, microtrauma etc.Osteoporosis is a kind of multifactor caused chronic disease.Before fracture occurs, usually without Special Clinical Manifestation.This sick women more than the male sex, but all can fall ill each period at age, is common in postmenopausal women and the elderly.Along with the increase of China's elderly population, developing osteoporosis rate is in ascendant trend, is all a health problem merited attention in China and even the whole world.

Osteoporotic hazardness is mainly the fracture caused by it, can betide any position of whole body, be most commonly in lumbar vertebrae, hip region and radius.Investigation in 1999 finds, China's more than 60 years old osteoporosis incidence, lumbar vertebrae 2 ~ 4: men and women's difference 11% and 21%; Neck of femur: be respectively 11% and 27%.There is osteoporosis in postmenopausal women's 1/3 ~ 1/2.In the U.S., this disease about makes 1,500,000 people fracture every year, and medical expense relevant is therewith more than 10,000,000,000 dollars.In the women of 65 years old, 1/3 will there is vertebral fracture, and when the age is larger, the women of 1/3 and the male sex of 1/6 Hip Fracture will occur, and wherein 20% die from the various complication caused by fracture, separately have the home care that 30% needs are long-term.Although China still lacks osteoporosis and have the definite incidence data of fracture at present, because elderly population are numerous, estimate considerable.Osteoporosis is not only a medical care problem equally in China, is also a serious public health and social concern.

The detection of osteoporosis comprises detection and the auxiliary detection of laboratory checking index.

Laboratory checking index:

Patients with osteoporosis part serum studentization index can change (comprising bone forming and bone resorption) state by reactive bone, under the high transformation condition (such as I type osteoporosis) of bone, these indexs can raise, and also can be used for the early response of monitor therapy.But its clinical meaning in osteoporosis still awaits further research.These Biochemistry measurement indexs comprise: the alkaline phosphatase (Bone-specificalkalinephosphatase that bone is special, reactive bone is formed), Tartrate resistant acid phosphatase (tartratedresistantacidphosphatse, reactive bone absorbs), Bone Gla protein (Osteocalcin, reactive bone is formed), I type tropocollagen peptide (TypeIprocollagenpeptidase, reactive bone is formed), Pyridinoline (Urinarypyridinoline) and Deoxypyridinoline (Urinarydeoxypyridinoline, reactive bone absorbs), the N-C-end of NTx is cross-linked peptide (cross-linkedN-andC-telopeptideoftypeIcollagen, reactive bone absorbs).As previously noted, use the tolerance range of biochemical indicator detection osteoporosis inadequate.

Auxiliary examination: comprise bone imaging examination and Bone mineral density.The object of auxiliary examination is all generally the patients with terminal of osteoporosis, can not be used for the examination of early stage patients with osteoporosis.

Based on the limitation of means detecting osteoporosis in prior art, find that a kind of effectively can to get final product the method that Diagnosis of osteoporosis occurs in early days be problem demanding prompt solution.

Summary of the invention

In order to make up the deficiencies in the prior art, one is the object of the present invention is to provide to can be used for the molecular marker of osteoporosis (Osterarthritis, OA) early diagnosis.Compare the diagnostic method of traditional osteoporosis, what use gene marker to carry out Diagnosis of osteoporosis has promptness, specificity and susceptibility, thus make patient just can know disease risks in early days in disease, for risk height, take corresponding prevention and therapy measure.

To achieve these goals, the present invention adopts following technical scheme:

The invention provides the application of product in the instrument preparing Diagnosis of osteoporosis detecting CERS2 genetic expression.

Further, the product of described detection CERS2 genetic expression comprises the product detecting CERS2 gene mRNA levels and/or the product detecting CERS2 protein level.

Further, the product of described detection CERS2 genetic expression comprises: by RT-PCR, real-time quantitative PCR, immunodetection, in situ hybridization or chip detection CERS2 genetic expression with the product of Diagnosis of osteoporosis.

Further, the product of described RT-PCR Diagnosis of osteoporosis at least comprises the primer of a pair specific amplified CERS2 gene; The product of described real-time quantitative PCR Diagnosis of osteoporosis at least comprises the primer of a pair specific amplified CERS2 gene; The product of described immunodetection Diagnosis of osteoporosis comprises: the antibody be combined with CERS2 protein-specific; The product of described in situ hybridization Diagnosis of osteoporosis comprises: with the probe of the nucleic acid array hybridizing of CERS2 gene; The product of described chip Diagnosis of osteoporosis comprises: protein chip and gene chip; Wherein, protein chip comprises the antibody be combined with CERS2 protein-specific, and gene chip comprises the probe with the nucleic acid array hybridizing of CERS2 gene.

The primer of a pair specific amplified CERS2 gene that the product of described real-time quantitative PCR Diagnosis of osteoporosis at least comprises is as shown in SEQIDNO.3 and SEQIDNO.4.

The product of described detection CERS2 genetic expression can be detect CERS2 genetic expression reagent, also can be the test kit, chip, test paper etc. that comprise described reagent, also can be the high-flux sequence platform using described reagent.

The instrument of described Diagnosis of osteoporosis includes but not limited to chip, test kit, test paper or high-flux sequence platform; High-flux sequence platform is a kind of instrument of special Diagnosis of osteoporosis, along with the development of high throughput sequencing technologies, will become work very easily to the structure of the gene expression profile of a people.By contrasting the gene expression profile of Disease and normal population, easily analyze exception and the disease-related of which gene.Therefore, in high-flux sequence, the exception of the CERS2 gene purposes that also belong to CERS2 gene relevant to osteoporosis is known, equally within protection scope of the present invention.

Present invention also offers a kind of instrument of Diagnosis of osteoporosis, described instrument comprises the reagent detecting CERS2 genetic expression; Described reagent comprises the antibody of the primer that detects CERS2 gene mRNA and/or probe, detection CERS2 albumen.

Described instrument includes but not limited to chip, test kit, test paper or high-flux sequence platform.

Wherein, described chip comprises gene chip, protein chip; Described gene chip comprises solid phase carrier and is fixed on the oligonucleotide probe of solid phase carrier, and described oligonucleotide probe comprises the oligonucleotide probe for CERS2 gene for detecting CERS2 gene transcription level; Described protein chip comprises solid phase carrier and is fixed on the specific antibody of CERS2 albumen of solid phase carrier; Described gene chip can be used for detecting the expression level of the multiple genes (such as, relevant to osteoporosis multiple genes) comprising CERS2 gene.Described protein chip can be used for detecting the expression level of the multiple protein (such as relevant to osteoporosis multiple protein) comprising CERS2 albumen.By being detected by multiple mark with osteoporosis simultaneously, the accuracy rate of diagnosis of osteoporosis greatly can be improved.

Wherein, described test kit comprises gene detecting kit and protein immunization detection kit; Described gene detecting kit comprises the reagent for detecting CERS2 gene transcription level; Described protein immunization detection kit comprises the specific antibody of CERS2 albumen.Further, described reagent comprises the reagent used needed in RT-PCR, real-time quantitative PCR, immunodetection, in situ hybridization or chip method detection CERS2 gene expression dose process.Preference, described reagent comprises primer for CERS2 gene and/or probe.The primer and probe that may be used for detecting CERS2 gene expression dose is easily designed according to the nucleotide sequence information of CERS2 gene.

Described test paper comprises the reagent detecting CERS2 genetic expression.

Described high-flux sequence platform comprises the reagent detecting CERS2 genetic expression.

Can be DNA, RNA, DNA-RNA mosaic, PNA or other derivative with the probe of the nucleic acid array hybridizing of CERS2 gene.The length of described probe does not limit, if complete specific hybrid, with object nucleotide sequence specific binding, any length can.The length of described probe can be as short as 25,20,15,13 or 10 bases longs.Equally, the length of described probe can grow to 60,80,100,150,300 base pairs or longer, even whole gene.Because different probe length has different impacts to hybridization efficiency, signal specificity, the length of described probe is at least 14 base pairs usually, the longlyest generally be no more than 30 base pairs, best with 15-25 base pair with the length of object nucleotide sequence complementary.Described probe self-complementary sequences most preferably less than 4 base pairs, in order to avoid affect hybridization efficiency.

Further, the specific antibody of described CERS2 albumen comprises monoclonal antibody, polyclonal antibody.The specific antibody of described CERS2 albumen comprise complete antibody molecule, any fragment of antibody or modification (such as, chimeric antibody, scFv, Fab, F (ab ') 2, Fv etc.As long as described fragment can retain the binding ability with CERS2 albumen.Well known to a person skilled in the art during preparation for the antibody of protein level, and the present invention can use any method to prepare described antibody.

In specific embodiment of the invention scheme, the primer of described detection CERS2 gene mRNA comprises the primer pair shown in SEQIDNO.3 and SEQIDNO.4.

Present invention also offers the application of inhibitor in the medicine of preparation treatment osteoporosis of CERS2 gene and/or its expression product.Described inhibitor comprises the reagent suppressing CERS2 genetic expression and/or the reagent suppressing CERS2 gene expression product.

Further, the reagent of described suppression CERS2 genetic expression comprises the reagent of reagent that suppressor gene transcribes, suppressor gene translation; The reagent of described suppression CERS2 gene expression product comprises the reagent suppressing CERS2 gene mRNA, the reagent suppressing CERS2 albumen.The reagent of described suppression CERS2 gene mRNA comprises the reagent suppressing mRNA stability, the reagent suppressing mRNA translation active.The reagent of described suppression CERS2 albumen comprises the reagent of the reagent suppressing CERS2 protein stability, the reagent suppressing CERS2 protein-active, suppression CERS2 protein function.

Further, the reagent of suppression CERS2 gene mRNA comprises the double stranded RNA for CERS2 gene mRNA; The reagent of CERS2 protein function is suppressed to comprise the tumor vaccine of CERS2 antigen protein, suppress the antibody of CERS2 protein function.Described antibody can be polyclonal antibody, or monoclonal antibody.

In specific embodiment of the invention scheme, the described double stranded RNA for CERS2 gene mRNA is siRNA.Can efficiently to be rejected in order to ensure CERS2 gene or reticent, the siRNA specific fragment according to the mRNA sequences Design of CERS2 gene.General design principle (the Elbashiret.al2001 that the design consideration of siRNA has been delivered, Schwarzet.al2003, Khvorovaet.al2003, Reynoldset.al2004, Hsiehet.al2004, Ui-Teiet.al2004), by online tool complete design, this online tool is: siRNASelectionProgramofWhiteheadInstitute (BingbingYuanet.al2004, http://jura.wi.mit.edu/bioc/siRNAext/) and BLOCK-iTTMRNAiDesignerofINVITROGEN (winnerofthe2004Frost & SullivanExcellenceinResearchAward, https: //rnaidesigner.invitrogen.com/sirna/).In order to improve the validity of siRNA segment further, the advantage of comprehensive two Photographing On-line instruments is designed for the siRNA segment of screening.Finally, filter siRNA sequence by sequence analysis (NCBIBLAST), with improve siRNA segment specificity and reduce RNAi interference effect of missing the target.

Preferably, the sequence of described siRNA is as shown in SEQIDNO.7 and SEQIDNO.8.

Present invention also offers a kind of pharmaceutical composition being used for the treatment of osteoporosis, described pharmaceutical composition comprises the inhibitor of CERS2 gene recited above and/or its expression product.

Pharmaceutical composition of the present invention also comprises pharmaceutically acceptable carrier, carrier, and this kind of carrier comprises (but being not limited to): thinner, vehicle are if water etc., weighting agent are as starch, sucrose etc.; Tackiness agent is as derivatived cellulose, alginate, gelatin and polyvinylpyrrolidone; Wetting agent is as glycerine; Disintegrating agent is as agar, calcium carbonate and sodium bicarbonate; Absorption enhancer quaternary ammonium compound; Tensio-active agent is as cetyl alcohol; Absorption carrier is as kaolin and soap clay; Lubricant is as talcum powder, calcium stearate and magnesium, polyoxyethylene glycol etc.

Pharmaceutical composition of the present invention also can with the drug combination of other treatment osteoporosis, multi-medicament conbined usage can mention the success ratio for the treatment of greatly.

In the context of the present invention, " CERS2 gene " comprises the polynucleotide of any function equivalent of CERS2 gene and CERS2 gene.CERS2 gene comprises and has more than 70% homology with CERS2 gene (NC_000001.11) DNA sequence dna in current international common core sequence databank GeneBank, and coding identical function protein DNA sequence;

Preferably, the encoding sequence of CERS2 gene comprises any DNA molecular following:

(1) DNA sequence dna shown in SEQ ID NO.1;

(2) under strict conditions with 1) DNA sequence dna that limits hybridizes and identical function protein DNA sequence of encoding;

(3) DNA sequence dna limited with (1) or (2) has 70%, preferably, more than 90% homology, and coding identical function protein DNA molecule.

In specific embodiment of the invention scheme, the encoding sequence of described CERS2 gene is the DNA sequence dna shown in SEQIDNO.1.

In the context of the present invention, CERS2 gene expression product comprises the partial peptide of CERS2 albumen and CERS2 albumen.The partial peptide of described CERS2 albumen contains the functional domain relevant to osteoporosis.

" CERS2 albumen " comprises any function equivalent of CERS2 albumen and CERS2 albumen.Described function equivalent comprises CERS2 albumen conservative variation's protein or its active fragments, or its reactive derivative, allelic variant, natural mutation, induced mutants, can with the protein coded by the DNA of the DNA hybridization of CERS2 under high or low stringent condition.

Preferably, CERS2 albumen is the protein with following amino acid sequences:

(1) protein be made up of the aminoacid sequence shown in SEQ ID NO.2;

(2) aminoacid sequence shown in SEQIDNO.2 had the protein derivative by the aminoacid sequence shown in SEQIDNO.2 of identical function with the aminoacid sequence shown in SEQIDNO.2 through the replacement of one or several amino-acid residue and/or disappearance and/or interpolation.The amino acid whose number replacing, lack or add is generally 1-50, preferably 1-30, and more preferably 1-20,1-10 is individual best.

(3) with the aminoacid sequence shown in SEQIDNO.2, there is at least 80% homology (being also called sequence iden), more preferably, with the aminoacid sequence shown in SEQIDNO.2 at least about 90% to 95% homology, be often 96%, 97%, 98%, 99% homology aminoacid sequence form polypeptide.

In specific embodiment of the invention scheme, described CERS2 albumen is the protein with the aminoacid sequence shown in SEQIDNO.2.

Usually, it is known that in a protein one or more amino acid whose modification can not affect the function of protein.Those skilled in the art can approve the amino acid that changes single amino acids or little per-cent or be conservative modifications to indivedual interpolations of aminoacid sequence, disappearance, insertion, replacement, and wherein the change of protein produces the protein with identity function.Intimate amino acid whose Conservative substitution tables is provided to be well known in the art.

By adding the fusion rotein that the example of the protein of an amino acid or multiple Modification of amino acid residues is CERS2 albumen.Peptide or protein with CERS2 protein fusion are not limited, as long as the fusion rotein of gained retains the biologic activity of CERS2 albumen.

CERS2 albumen of the present invention also comprises the non-conservative modification to the aminoacid sequence shown in SEQIDNO.2, as long as the protein through modifying still can retain the biologic activity of CERS2 albumen.The amino acid number suddenlyd change in this type of modifying protein normally 10 or less, such as 6 or less, such as 3 or less.

In the context of the present invention, " Diagnosis of osteoporosis " had both comprised and had judged whether experimenter has suffered from osteoporosis, also comprised and judge whether experimenter exists the risk suffering from osteoporosis.

In the context of the present invention, " treatment osteoporosis " divides from the change of state of disease, can comprise the healing completely of the alleviation of disease, disease.

Advantage of the present invention and beneficial effect:

Late Cambrian of the present invention CERS2 genetic expression is relevant to osteoporosis, by detecting the expression of CERS2 in experimenter's osseous tissue, can judge whether experimenter suffers from osteoporosis or judge whether experimenter exists the risk suffering from osteoporosis, thus instruct clinicist to provide prevention scheme or treatment plan to experimenter.

Present invention finds a kind of new molecular marked compound-CERS2 gene, compare traditional detection means, gene diagnosis more in time, more special, sensitiveer, the early diagnosis of osteoporosis can be realized, thus reduce the mortality ratio of osteoporosis.

Accompanying drawing explanation

Fig. 1 display utilizes the expression of genechip detection CERS2 gene in osseous tissue;

Fig. 2 display utilizes Westernblot to detect the expression of CERS2 albumen in osseous tissue;

Fig. 3 display utilizes QPCR to detect siRNA to the jamming effectiveness of CERS2 gene;

Fig. 4 display utilizes Westernblot to detect siRNA to the impact of CERS2 protein expression;

Fig. 5 shows suppression CERS2 protein function to the impact of osteoblastic proliferation.

Concrete embodiment

Below in conjunction with drawings and Examples, the present invention is further detailed explanation.Following examples are only not used in for illustration of the present invention and limit the scope of the invention.The experimental technique of unreceipted actual conditions in embodiment, usual conveniently condition, the people such as such as Sambrook, molecular cloning: laboratory manual (NewYork:ColdSpringHarborLaboratoryPress, 1989) condition described in, or according to the condition that manufacturer advises.

The differential expression of embodiment 1CERS2 gene

1, research object:

Stochastic choice is about to the patient carrying out marrow joint replacement, detects bone density, selects patients with osteoporosis 50 example, and normal bone density control group (be exogenous injury, detect without osteoporosis) 50 is routine, age 52-68 year.Situation such as way of questionnaires investigation experimenter's mode of life and healthy state etc.

The inclusive criteria of patients with osteoporosis: (1) meets diagnosis of osteoporosis standard person, with reference to " Chinese's osteoporosis suggestion Case definition (the second original text); (2) the equal informed consent of patient.

The exclusion standard of patients with osteoporosis: secondary osteoporosis person.

2, the acquisition of osseous tissue RNA

From the human femur head that marrow joint replacement takes off, get hard bone 1g, be placed in rapidly liquid nitrogen and preserve.Use the total serum IgE in Trizol single stage method extraction people osseous tissue in laboratory, measured the purity of RNA solution by the absorbance (A) at NanodropND-1000 reading 260nm and 280nm place.Through 1% denaturing formaldehyde agarose gel electrophoresis, observe under ultraviolet transmission light, detect the integrity of RNA.

3, gene chip hybridization and scanning

After the linearized amplification of total serum IgE, cy3-UTP marks, and the cRNAs after fluorescent mark adopts RNEASYMiniKit purifying, carries out fragmentation process with the RNAFragmentationReagents of Amhion to the cRNAs marked.Adopt people's full genome chip of expression spectrum (4x44K gene) of Agilent company of the U.S., in chip hybridization stove, 65 DEG C of hybridization 17h, then wash-out, dyeing, finally use AgilentDNAMicroarrayScanner scanner scanning.

4, chip data treatment and analyses

Chip after hybridization after chip scanner reading of data point, by data importing analysis software, the natural logarithm absolute value for two groups of ratios be greater than 2.0 or be less than 0.5 gene as difference expression gene.

5, statistical procedures

Adopt SPSS13.0 statistical software to carry out data analysis, group difference compares employing one-way analysis of variance method, and P<0.05 difference has significant.

6, result

Result display (as shown in Figure 1), compared with normal people, in patients with osteoporosis osseous tissue, the mRNA level in-site of CERS2 gene significantly increases, and difference has statistical significance (P<0.05).

The differential expression of embodiment 2CERS2 albumen

1, research object is with embodiment 1.

1, the drawing materials and cultivating of human osteoblast cell

From the human femur head that marrow joint replacement takes off, get spongy bone, reject soft tissue, physiological saline rinses sclerotin repeatedly, after washing fluid clarification, rinses and sways 3 times, be cut into 1mm with PBS liquid ³fragment, adopt enzyme digestion be separated and purifying scleroblast.Be inoculated in (culturing bottle adds appropriate DMEM-F12 (1:1) substratum and 10% foetal calf serum) in the culturing bottle of 30ml, be placed in 37 DEG C, the CO of 5% ₂cultivate in constant incubator.Change liquid after 2d and remove not adherent cell, every 3d changes liquid 1 time later, observes under inverted microscope.Be fused into after individual layer until primary cell, with the trysinization of 2.5g/L, go down to posterity.

2, the extraction of total protein of cell

Phase of taking the logarithm, well-grown scleroblast carried out the extraction of total protein of cell, carried out the operation of protein extraction according to the specification sheets of the full cell extraction test kit of EpiQuik.

3, Westernblot detects

The protein quantification of extraction is carried out SDS-PAGE electrophoresis, carries out transferring film afterwards, close, primary antibodie hatches, two anti-ly to hatch, develop the color.

4, statistical procedures

Use ImageJ software to analyze the gray-scale value of protein band, with β-actin for internal reference, the gray-scale value of CERS2 protein band is normalized.Result data is all represent in the mode of mean+SD, adopts SPSS13.0 statistical software to carry out statistical study, and difference between the two adopts t inspection, thinks to have statistical significance as P<0.05.

5, result

As shown in Figure 2, compared with normal people, in patients with osteoporosis osseous tissue, the expression level of CERS2 albumen significantly increases result, and difference has statistical significance (P<0.05).

Embodiment 3 suppresses CERS2 genetic expression

1, siRNA design and synthesis

SiRNA sequence for CERS2:

siRNA1-CERS2：

Positive-sense strand is 5 '-AACUUUCUUCAUGUCAUAGAA-3 ' (SEQIDNO.7);

Antisense strand is 5 '-CUAUGACAUGAAGAAAGUUUG-3 ' (SEQIDNO.8),

siRNA2-CERS2：

Positive-sense strand is 5 '-UCAUGUAGUACCAAUACUGGG-3 ' (SEQIDNO.9);

Antisense strand is 5 '-CAGUAUUGGUACUACAUGAUU-3 ' (SEQIDNO.10),

siRNA3-CERS2：

Positive-sense strand is 5 '-AAUCCUUUCGCUUGACAUCAG-3 ' (SEQIDNO.11);

Antisense strand is 5 '-GAUGUCAAGCGAAAGGAUUUC-3 ' (SEQIDNO.12)

Negative control siRNA sequence (siRNA-NC):

Positive-sense strand is 5 '-CGUACGCGGAAUACUUCGA-3 ' (SEQIDNO.13);

Antisense strand is 5 '-UCGAAGUAUUCCGCGUACG-3 ' (SEQIDNO.14).

Carry out the osteoblastic vitro culture of osteoporosis according to the method for embodiment 2, the scleroblast in vegetative period of taking the logarithm is by 1 × 10 ⁴/ hole is inoculated in 24 porocyte culture plates, at 37 DEG C, 5%CO ₂cell cultures 24h in incubator, transfection is according to the specification sheets transfection of lipofectamine 2000 (purchased from Invitrogen company), experiment is divided into, negative control group and experimental group (20nM), wherein, the sequence of negative control group siRNA and CERS2 gene is without homology, concentration is 20nM/ hole, simultaneously transfection respectively.

2, QPCR is utilized to test the jamming effectiveness detecting siRNA.

2.1 extract cell total rna utilizes ordinary method to operate.

2.2 reverse transcription

The Reverse Transcriptase kit of TAKARA company is utilized to carry out the reverse transcription of RNA.

2.3QPCR

(1) design of primers

According to the encoding sequence design QPCR amplimer of CERS2 gene and GAPDH gene in Genbank, synthesized by Shanghai Sangon Biological Engineering Technology And Service Co., Ltd.Concrete primer sequence is as follows:

CERS2 gene:

Forward primer is 5 '-GATTACCTGCTGGAGTCA-3 ' (SEQIDNO.3);

Reverse primer is 5 '-AGACGATGAAGATGTTGTTG-3 ' (SEQIDNO.4),

GAPDH gene:

Forward primer is 5 '-TTTAACTCTGGTAAAGTGGATAT-3 ' (SEQIDNO.5);

Reverse primer is 5 '-GGTGGAATCATATTGGAACA-3 ' (SEQIDNO.6).

(2) PCR reaction system is prepared according to table 1:

Wherein, SYBRGreen polymerase chain reaction system is purchased from Invitrogen company.

Table 1PCR reaction system

Reagent	Volume
		Forward primer	1μl

Reverse primer	1μl
		SYBR Green polymerase chain reaction system	12.5μl
Template	2μl
		Deionized water	Supply 25 μ l

(3) PCR reaction conditions: 95 DEG C of 12min, (95 DEG C of 15s, 60 DEG C of 50s) * 42 circulation.Using SYBRGreen as fluorescent marker, in the enterprising performing PCR reaction of LightCycler quantitative real time PCR Instrument, by melt curve analysis analysis and electrophoresis determination object band, Δ Δ CT method carries out relative quantification.

2.4 statistical method

Experiment has all come for 3 times according to repetition, result data is all represent in the mode of mean+SD, employing SPSS13.0 statistical software carries out statistical study, difference between interference CERS2 genetic expression group and control group adopts t to check, and thinks to have statistical significance as P<0.05.

2.5 result

Result as shown in Figure 3, compared with siRNA2-CERS2, siRNA3-CERS2, siRNA1-CERS2 can the expression of more effective suppression CERS2 gene, and difference has statistical significance (P<0.05), uses siRNA1-CERS2 to carry out follow-up experiment.

3, Westernblot experiment detects the jamming effectiveness of siRNA1-CERS2

Step is with embodiment 2.

As shown in Figure 4, compared with transfection siRNA-NC group, in the cell of transfection siRNA1-CERS2, the content of CERS2 albumen obviously reduces result, and difference has statistical significance (P<0.05).

The expression of embodiment 4CERS2 gene is to the mensuration of osteoblastic proliferation ability

Use CellCountingkit-8 (cck-8) test kit for being detected as the detection of bone cell proliferation

1, step

Carry out osteoblastic cultivation and transfection according to the method for preceding embodiment, cell is divided into three experimental group:

Group 1: the scleroblast transfection siRNA-NC (normal+siRNA-NC) in normal bone dense tissue source;

Group 2: the scleroblast transfection siRNA-NC (osteoporosis+siRNA-NC) of sufferers of osteoporosis face;

Group 3: the scleroblast transfection siRNA-CERS2 (osteoporosis+siRNA-CERS2) of sufferers of osteoporosis face

After transfection 24h, with 2 × 10 ⁵/ ml density is inoculated in 96 porocyte culture plates, and each experimental group design three wells, every hole 100 μ l, is positioned over 37 DEG C, 5%CO ₂hatch in incubator, after 24h cell attachment, in the culture hole of required detection, every hole adds 10 μ lCK-8 solution respectively, continues to hatch 1h in cell culture incubator, measures each hole, 450nm place absorbance (OD value)

2, statistical method

Experiment has all come for 3 times according to repetition, result data is all represent in the mode of mean+SD, adopt SPSS13.0 statistical software to carry out statistical study, difference between the two adopts t inspection, thinks to have statistical significance as P<0.05.

3, result

Result is as shown in table 2, compared with normal bone density people, the osteoblastic proliferation of sufferers of osteoporosis face is slow, after sufferers of osteoporosis face interference CERS2 genetic expression, osteoblastic propagation is accelerated, and difference has statistical significance (P<0.05).Above-mentioned experimental result shows, CERS2 gene expression inhibition sufferers of osteoporosis face osteoblastic propagation, uses osteoblastic inhibited proliferation after suppressing the reagent of CERS2 genetic expression to remove.

Table 2 scleroblast OD value

Experimental group	OD value (optical density(OD))
		Normally+siRNA-NC	0.1792±0.005
Osteoporosis+siRNA-NC	0.0831±0.007
		Osteoporosis+siRNA-CERS2	0.1624±0.002

Embodiment 5 scleroblast antibody Neutralizing test

1, step:

Scleroblast is inoculated in 96 porocyte culture plates, every hole 2x10 ³cells/ hole/200 μ l, is handled as follows after cell attachment:

Experimental group 1: add irrelevant monoclonal antibody (1:30) in the scleroblast in normal bone dense tissue source, as a control group;

Experimental group 2: add irrelevant monoclonal antibody (1:30) (osteoporosis+irrelevant monoclonal antibody) in the scleroblast of sufferers of osteoporosis face;

Experimental group 3: add anti-human CERS2 monoclonal antibody (1:30) (osteoporosis+CERS2 monoclonal antibody) in the scleroblast of sufferers of osteoporosis face

By cell at 37 DEG C, 5%CO ₂incubator adds after hatching 24 hours ³h-TdR (1 μ Ci/ hole), then cultivate 24 hours, collecting cell, add liquid scintillation solution, β calculating instrument detects cpm value.

2, statistical method

3, result

As shown in Figure 5, compared to control group, it is slack-off that (osteoporosis+irrelevant monoclonal antibody) organizes cell proliferation to result, and the propagation that (osteoporosis+CERS2 monoclonal antibody) that add CERS2 monoclonal antibody organizes cell obtains recovery.Above-mentioned experimental result shows, suppresses the function of CERS2 albumen to promote osteoblastic proliferation.

The explanation of above-described embodiment is just for understanding method of the present invention and core concept thereof.It should be pointed out that for the person of ordinary skill of the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also will fall in the protection domain of the claims in the present invention.

Claims

1. detect the application of product in the instrument preparing Diagnosis of osteoporosis of CERS2 genetic expression.

2. application according to claim 1, is characterized in that, described product comprises: by RT-PCR, real-time quantitative PCR, immunodetection, in situ hybridization, chip or high-flux sequence detection of platform CERS2 genetic expression with the product of Diagnosis of osteoporosis; The product of described RT-PCR Diagnosis of osteoporosis at least comprises the primer of a pair specific amplified CERS2 gene; The product of described real-time quantitative PCR Diagnosis of osteoporosis at least comprises the primer of a pair specific amplified CERS2 gene; The product of described immunodetection Diagnosis of osteoporosis comprises: the antibody be combined with CERS2 protein-specific; The product of described in situ hybridization Diagnosis of osteoporosis comprises: with the probe of the nucleic acid array hybridizing of CERS2 gene; The product of described chip Diagnosis of osteoporosis comprises: protein chip and gene chip; Wherein, protein chip comprises the antibody be combined with CERS2 protein-specific, and gene chip comprises the probe with the nucleic acid array hybridizing of CERS2 gene.

3. application according to claim 2, is characterized in that, the primer of a pair specific amplified CERS2 gene that the product of described real-time quantitative PCR Diagnosis of osteoporosis at least comprises is as shown in SEQIDNO.3 and SEQIDNO.4.

4. an instrument for Diagnosis of osteoporosis, is characterized in that, described instrument comprises the reagent detecting CERS2 genetic expression; Described reagent comprises the antibody of the primer that detects CERS2 gene mRNA and/or probe, detection CERS2 albumen.

5. instrument according to claim 4, is characterized in that, the primer of described detection CERS2 gene mRNA comprises the primer pair shown in SEQIDNO.3 and SEQIDNO.4.

The application of inhibitor in the medicine of preparation treatment osteoporosis of 6.CERS2 gene and/or its expression product.

7. application according to claim 6, is characterized in that, described inhibitor comprises the reagent suppressing CERS2 genetic expression and/or the reagent suppressing CERS2 gene expression product.

8. application according to claim 7, is characterized in that, the reagent of described suppression CERS2 gene expression product comprises the antibody suppressed for siRNA and/or the CERS2 albumen of CERS2 gene.

9. application according to claim 8, is characterized in that, the described siRNA sequence for CERS2 gene is as shown in SEQIDNO.7 and SEQIDNO.8.

10. be used for the treatment of a pharmaceutical composition for osteoporosis, it is characterized in that, described pharmaceutical composition comprises the inhibitor according to any one of claim 6-9.