Summary of the invention
It is an object of that present invention to provide a kind of induced lipolysis stem cells into the cultural method and culture solution of cartilage differentiation.
Above-mentioned purpose is achieved through the following technical solutions:
A kind of induced lipolysis stem cell includes the following steps: at the cultural method of cartilage differentiation
(1) fat stem cell is separately cultured: taking patient or healthy volunteer's subcutaneus adipose tissue, PBS buffer solution rinses 2
~3 times, adipose tissue film and blood vessel are removed with eye scissors and ophthalmic tweezers and is cut into 1mm3The fragment of size, 0.1% Type I collagen enzyme
With 0.25% pancreatin, 37 DEG C of digestion 40min, during which stir 4~5 times, be added complete medium after digestion, 1500r/min from
Heart 10min, abandons fat cell and fat drips that supernatant removal suspends, and cell precipitation is resuspended in complete medium, is inoculated in culture bottle
In, in 37 DEG C, 5%CO2It is cultivated in incubator, changes culture solution afterwards for 24 hours and remove non-attached cell, change liquid within every 3 days later, cell melts
With 0.25% pancreatin and 1mmol/LEDTA37 DEG C of 3~5min of digestion after conjunction, complete medium, which terminates, to be digested, the passage of 1:2 ratio;
(2) fat stem cell is induced at cartilage differentiation: taking passage cell with 1 × 106The density of/mL is inoculated in containing completely
In the culture bottle of culture medium, 37 DEG C, 5%CO2After cultivating 48h, incomplete culture medium is replaced medium to, while Sox9 base is added
Because activator continues culture 2~4 weeks, during which every 3d changes a subculture (i.e. drug containing DMEM).
Preferably, complete medium is the DMEM containing 10% fetal calf serum.
Preferably, incomplete culture medium is the DMEM without fetal calf serum.
Preferably, Sox9 gene activation is red sesame aldehyde B.
Preferably, take the 3rd~5 generation passage cell for induction.
A kind of induced lipolysis stem cell at cartilage differentiation culture medium, for the DMEM culture for adding Sox9 gene activation
Base.
Preferably, Sox9 gene activation is red sesame aldehyde B.
Method provided by the invention can induced lipolysis stem cell can be effectively kind with fat stem cell at cartilage differentiation
A large amount of cartilage cells are prepared to meet the needs of clinic is to cartilage cell in daughter cell.
Specific embodiment
Technical solution of the present invention is introduced combined with specific embodiments below.Non- special emphasis tests material in following embodiments
Material is routine experiment material, is had no special requirements, and is all the conventional material that those skilled in the art are easy to get.
One, experimental material
Red sesame aldehyde A, the self-control of red sesame aldehyde B standard product, for purity 98% or more, chemical information is as follows.
DMEM culture medium and fetal calf serum are purchased from Gibco company.
Two, experimental method
1, fat stem cell is separately cultured
The subcutaneus adipose tissue of healthy volunteer is taken, PBS buffer solution is rinsed 3 times, removes fat with eye scissors and ophthalmic tweezers
Tissue film and blood vessel are simultaneously cut into 1mm3The fragment of size, 37 DEG C of digestion 40min of 0.1% Type I collagen enzyme and 0.25% pancreatin, during which
Complete medium (DMEM containing 10% fetal calf serum, similarly hereinafter) is added after digestion in stirring 5 times, 1500r/min centrifugation
10min abandons fat cell and fat drips that supernatant removal suspends, and cell precipitation is resuspended in complete medium, is inoculated in culture bottle,
In 37 DEG C, 5%CO2It is cultivated in incubator, changes culture solution afterwards for 24 hours and remove non-attached cell, change liquid, cell fusion within every 3 days later
4min is digested with 0.25% pancreatin and 1mmol/L EDTA37 DEG C afterwards, complete medium terminates digestion, the passage of 1:2 ratio.
2, the induction differentiation of fat stem cell
Take the 4th generation passage cell with 1 × 106The density of/mL is inoculated in the culture bottle containing complete medium, and 37 DEG C,
5%CO2It after cultivating 48h, replaces medium to incomplete culture medium (DMEM without fetal calf serum), grouping culture:
Red sesame aldehyde A group: final concentration of 25 μM of red sesame aldehyde A is added in incomplete culture medium;
Red sesame aldehyde B group: final concentration of 25 μM of red sesame aldehyde B is added in incomplete culture medium;
Control group: being only incomplete culture medium.
Continue culture 3 weeks, during which every 3d changes a subculture.
3, it is detected at cartilage differentiation
After cultivating 3 weeks, western blot detects the expression quantity of II Collagen Type VI and proteoglycans (aggrecan).Step is such as
Under: after the cell of each group is cracked by RIPA, BCA is quantitative, after SDS-PAGE is separated, using half dry type electrotransfer method by albumen
It is transferred on PVDF from gel.Film being placed in 5% defatted milk (being dissolved in PBS, pH7.4), overnight, TBST washes film for 4 DEG C of closings,
Each 5min, is repeated 3 times.Be added the diluted primary antibody collagen-II (1:2000) of TBST, aggrecan (1:1000) and
GAPDH (1:2000), 4 DEG C of overnight incubations.TBST washes film, and each 5min is repeated 3 times, horseradish peroxidase (HRP) label
The sheep anti-Mouse secondary antibody (1:2000) of goat-anti rabbit secondary antibody (1:2000) and HRP label is incubated at room temperature 2h.TBST washes film, every time
10min is repeated 3 times, and reacts 2min, gel imaging system development imaging in chemiluminescence detection reagent.Calculate II Collagen Type VI/
GAPDH, proteoglycans/GAPDH relative expression quantity.
4, RT-qPCR method detects Sox9mRNA relative expression quantity
Each group is added Trizol and extracts cell total rna, (anti-with PrimeScrip RT Master Mix after measuring concentration
Transcript reagent box), according to the system reverse transcription of 500ng/10 μ l at the cDNA of 50 μ l, with SYBRPremix Ex Taq, (fluorescence is fixed
Measure PCR kit) Sox9mRNA relative expression quantity is detected on ABI7500 real-time fluorescence quantitative PCR instrument with 20 μ l systems.With
For GAPDH gene expression dose as internal reference, the ratio for calculating Sox9mRNA/GAPDH gene represents the relative expression of Sox9mRNA
Level, gene expression relative quantification, which is calculated, carries software using instrument.
Primer sequence is as follows:
5, statistical analysis
Data processing carries out one-way analysis of variance using 19.0 software of SPSS, is as a result indicated with mean ± standard deviation, group
Between compare P < 0.05 and think there is statistical difference.
Three, experimental result
1, II Collagen Type VI of group of cells and proteoglycans expression quantity
Western blot testing result is as shown in Figure 1.II Collagen Type VI of control group and red sesame aldehyde A group, proteoglycans expression
It is extremely weak, visible obvious II Collagen Type VI of red sesame aldehyde B group, proteoglycans expression.
The above results show red sesame aldehyde B group fat stem cell obviously to Chondrocyte Differentiation.
2, each group Sox9mRNA relative expression quantity
Compared to control group (1.00 ± 0.08, normalized), red sesame aldehyde B group Sox9mRNA relative expression quantity (3.41
± 0.13) significant to increase, and red sesame aldehyde A group is without significantly raised (1.09 ± 0.07).
The above results show that red sesame aldehyde B significantly has activated the expression of Sox9 gene in fat stem cell.
To sum up, red sesame aldehyde B can by activate Sox9 gene expressing promoting into fat stem cell at cartilage differentiation, and
Red sesame aldehyde A does not have this effect.Therefore, red sesame aldehyde B may be used as fat stem cell into chondrocyte induction differentiation agent, can add
Fat stem cell is prepared into DMEM culture medium into cartilage differentiation induced medium.
The above-mentioned technical solution that the specific embodiments are only for explaining the present invention, it will be appreciated by those skilled in the art that, this hair
Bright protection scope is not limited to above-mentioned specific embodiment.