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CN114717185A - Separation and culture method of giant panda placenta mesenchymal stem cells - Google Patents

Separation and culture method of giant panda placenta mesenchymal stem cells Download PDF

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CN114717185A
CN114717185A CN202210331080.3A CN202210331080A CN114717185A CN 114717185 A CN114717185 A CN 114717185A CN 202210331080 A CN202210331080 A CN 202210331080A CN 114717185 A CN114717185 A CN 114717185A
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林鹏飞
雷颖虎
赵鹏鹏
张丹辉
沈洁娜
赵卫平
高更更
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Qinling Giant Panda Research Center Shaanxi Rare Wildlife Rescue Base
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Abstract

The invention belongs to the field of stem cell separation and culture, and particularly relates to a panda placenta mesenchymal stem cell separation and culture method. The method comprises the following steps: step 1: aseptically collecting giant panda placenta; step 2: primarily separating the giant panda placenta mesenchymal stem cells by adopting a collagenase digestion method, and culturing the separated tissues in a culture dish; and step 3: performing cell morphological characteristic identification, surface mark identification and induced differentiation identification on the placenta mesenchymal stem cells cultured in the step 2; and 4, step 4: freezing and storing the cultured and subcultured placenta mesenchymal stem cells, and taking out the cells for cell recovery when in use. The invention obtains the highly purified giant panda placenta mesenchymal stem cells by adding high-concentration combined antibiotics and washing for many times when collecting the placenta, adopting a collagenase digestion method for separation culture and designing a giant panda placenta mesenchymal stem cell marker gene specific primer and the like.

Description

Giant panda placenta mesenchymal stem cell separation and culture method
Technical Field
The invention belongs to the field of stem cell separation and culture, and particularly relates to a panda placenta mesenchymal stem cell separation and culture method.
Background
The giant pandas are species of the world for protecting the biodiversity, the Qinling mountain giant pandas are important subspecies populations of the giant pandas, have unique morphological characteristics and genetic characteristics, actively develop the work of preserving the germ plasm resources of the Qinling mountain giant pandas, establish the stem cell bank of the germ plasm resources of the Qinling mountain giant pandas, and have important functions and significance for protecting the genetic diversity of the giant pandas in China. The mesenchymal stem cells have the potential of multidirectional differentiation as the pluripotent stem cells, can be used as ideal stem cells for clinical treatment, and provide the best raw materials for clinical treatment of panda diseases. The placenta is used as a delivery waste product, and the damage to panda individuals can be used as the best mode for the source of the mesenchymal stem cells.
However, after the giant panda placenta is collected, it is often difficult to obtain high-purity giant panda placenta mesenchymal stem cells due to the problems of pollution, difficult cell emigration during tissue block culture and the like.
Disclosure of Invention
Aiming at the technical problems, the invention provides a separation and culture method of giant panda placenta mesenchymal stem cells, which comprises the steps of adding high-concentration combined antibiotics and washing for multiple times when collecting the placenta, adopting a collagenase digestion method for separation and culture, designing marker gene specific primers of the giant panda placenta mesenchymal stem cells and the like, and obtaining the high-purity giant panda placenta mesenchymal stem cells.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a giant panda placenta mesenchymal stem cell separation and culture method comprises the following steps:
step 1: aseptically collecting giant panda placenta;
step 2: primarily separating giant panda placenta mesenchymal stem cells by adopting a collagenase digestion method, and culturing the separated tissues in a culture dish;
and step 3: performing cell morphological characteristic identification, surface mark identification and induced differentiation identification on the placenta mesenchymal stem cells cultured in the step 2;
and 4, step 4: and (4) freezing and storing the cultured and passaged placenta mesenchymal stem cells, and taking out the placenta mesenchymal stem cells for cell recovery when in use.
Preferably, the specific operation of step 1 is:
step 1.1: storing the naturally delivered panda placenta in physiological saline containing 1% double antibody at 25 ℃, and transporting to a laboratory within 6h for primary cell separation, wherein the 1% double antibody is 100U/mL penicillin and 100U/mL streptomycin;
step 1.2: transferring the placenta tissue to a culture dish added with 75% alcohol in an ultra-clean workbench, soaking for 30s, taking out, washing with normal saline for 5-10 times, then soaking in 3-5% of triantion-containing normal saline for washing for 1min, transferring the placenta tissue to a new culture dish, and repeatedly soaking and washing with the 3-5% of triantion-containing normal saline for 10-15 times, wherein the triantion is penicillin, streptomycin and amphotericin;
step 1.3: step 1.2 after the wash was complete, the tissue was transferred to DMEN medium containing 1% double antibody, 20% fetal bovine serum.
Preferably, the specific operation of step 2 is:
step 2.1: cutting panda placenta tissue of step 1.3 into pieces of 1mm by using sterilized ophthalmic scissors3Adding 0.25% IV collagenase for digestion and blow beating for 40min, centrifuging at 1100rpm for 6min, removing supernatant, adding 1% double antibody and 20% fetal calf serum containing DMEN culture solution suspension cells, and transferring to a culture dish for culture;
step 2.2: observing the growth state of the cells every day, replacing the fresh culture medium in time, and carrying out digestion subculture by using 0.25% pancreatin diluted by 3-5 times when the cells grow to 80% confluence.
Preferably, the step 3 comprises:
3.1: cell morphological characterization
The placenta mesenchymal stem cells should show the adhesion capacity to a culture dish in the growth process, the cells are in a fusiform flat shape, the protrusion of a central nucleus is clear, the boundary is not obvious, and clear cell myofilament structures can be observed under a high power microscope;
3.2: surface marking identification
Step 3.2.1: extracting total RNA, collecting placenta mesenchymal stem cells, conducting Trizol lysis and room-temperature blowing for 5min, adding chloroform for centrifugation and layering, collecting a water sample layer, reducing the RNA through isopropanol precipitation, and extracting to obtain RNA;
step 3.2.2: the cDNA is synthesized by reverse transcription,
step 3.2.3: designing and synthesizing a giant panda placental mesenchymal stem cell surface marker gene primer, and identifying whether the giant panda placental mesenchymal stem cell surface marker gene primer is expressed or not through qRT-PCR;
3.3: and (3) induced differentiation identification, which comprises osteogenic induction culture result determination, adipogenic induction culture result determination and chondrogenic induction culture result determination.
Preferably, the cells are subjected to gradient cooling when being frozen, the cooling speed is-1 ℃/min to-2 ℃/min when the freezing is started, the speed can be increased when the temperature is lower than-25 ℃, and the cells are transferred to liquid nitrogen for storage after the temperature is reduced to-80 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. soaking the giant panda placenta in 75% alcohol for 30s and washing the giant panda placenta with 3% -5% physiological saline for multiple times, so that the pollution phenomenon generated during placenta collection can be effectively reduced, and the high-purity giant panda placenta mesenchymal stem cells can be obtained by adopting a 0.25% IV type collagenase digestion method;
2. adopting collagenase digestion method to successfully obtain the mesenchymal stem cells. In the existing process of separating cells by using a tissue block adherence method, no cells are emigrated after 10 days to 14 days after the tissue block adherence. Analysis comparing the differences of the two tests gives the following differences: 1) the placenta tissue should be transported to the laboratory quickly after delivery, and over 6 hours will affect the cell activity of the tissue; 2) the traditional tissue block separation method has low cell migration rate and long time consumption, the pandas are delivered naturally, the placenta is naturally exposed to the polluted environment, the placenta is inevitably affected in the process of carrying out sterile treatment on the placenta, the placenta tissue is mechanically sheared into small blocks and then digested by collagenase, the digestion time can be effectively reduced, and the incompletely digested tissue is inoculated on a culture dish again, so that the cells can be successfully migrated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a morphological feature diagram of the placenta mesenchymal stem cells of Qinling mountain panda (a is multiplied by 100, b is multiplied by 40);
FIG. 3 is a picture of identification of osteogenic induced differentiation of mesenchymal stem cells of Qinling mountain panda placenta isolated and cultured according to the present invention;
FIG. 4 is a picture of identification of adipogenic induced differentiation of mesenchymal stem cells of Qinling mountain panda placenta isolated and cultured according to the present invention;
FIG. 5 is a drawing of identification of chondrogenic induced differentiation of mesenchymal stem cells of Qinling mountain panda placenta isolated and cultured in the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
referring to the attached figure 1, a method for separating and culturing giant panda placenta mesenchymal stem cells, which is a flow chart of the method, comprises the following steps:
step 1: aseptic collection of giant panda placenta comprises the following specific operations:
step 1.1: storing the naturally delivered panda placenta in physiological saline containing 1% double antibody at 25 ℃, and conveying the preserved panda placenta to a laboratory within 6h for primary cell separation;
step 1.2: transferring the placenta tissue to a culture dish added with 75% alcohol in an ultra-clean workbench, soaking for 30s, taking out, washing for 5-10 times by using normal saline, then soaking in 3-5% of three-resistant normal saline for washing for 1min, transferring the placenta tissue to a new culture dish, and repeatedly soaking and washing for 10-15 times by using the 3-5% of three-resistant normal saline, wherein the three-resistant is penicillin, streptomycin and amphotericin, wherein the penicillin content is 10kU/ml, the streptomycin content is 10mg/ml, and the amphotericin B content is 25 mu g/ml;
step 1.3: step 1.2 after the wash was complete, the tissue was transferred to DMEN medium containing 1% double antibody, 20% fetal bovine serum.
Step 2: primarily separating giant panda placenta mesenchymal stem cells by adopting a collagenase digestion method, and culturing the separated tissue in a culture dish, wherein the specific operation is as follows:
step 2.1: cutting panda placenta tissue of step 1.3 into pieces of 1mm by using sterilized ophthalmic scissors3Adding 0.25% IV collagenase for digestion and blow beating for 40min, centrifuging at 1100rpm for 6min, removing supernatant, adding 1% double antibody and 20% fetal calf serum containing DMEN culture solution suspension cells, and transferring to a culture dish for culture;
step 2.2: observing the growth state of the cells every day, replacing the fresh culture medium in time, and carrying out digestion subculture by using 0.25% pancreatin diluted by 3-5 times when the cells grow to 80% confluence.
And step 3: performing cell morphological characteristic identification, surface mark identification and induced differentiation identification on the placenta mesenchymal stem cells cultured in the step 2; the method comprises the following steps:
3.1: cell morphological characterization
The placenta mesenchymal stem cells should show the adhesion capacity to a culture dish in the growth process, the cells are in a fusiform flat shape, the protrusion of a central nucleus is clear, the boundary is not obvious, and the clear cell myofilament structure can be observed under a high power microscope, which is shown in figure 2;
3.2: surface marking identification
Step 3.2.1: extracting total RNA, collecting placenta mesenchymal stem cells, conducting Trizol lysis and room-temperature blowing for 5min, adding chloroform for centrifugation and layering, collecting a water sample layer, reducing the RNA through isopropanol precipitation, and extracting to obtain RNA; the method specifically comprises the following steps:
(1) washing mesenchymal stem cells by using precooled PBS, adding RNAtrizol for reacting for 5min, repeatedly blowing and beating until the cells are cracked into uniform solution, and collecting the uniform solution in a 1.5ml RNase-free EP tube;
(2) adding 200ul of trichloromethane, violently shaking for 15s to mix uniformly, standing at room temperature for 5min, centrifuging at 12000rpm/min in a 4 ℃ centrifuge for 15 min, and transferring the upper aqueous phase into an Eppendorf tube;
(3) adding isopropanol with the same volume, mixing uniformly, standing at room temperature for 10 minutes, centrifuging at 12000rpm/min in a centrifuge at 4 ℃ for 10 minutes, and observing that white precipitate is RNA;
(4) discarding the supernatant, placing on ice, adding 1ml of 75% alcohol, blowing, shaking, centrifuging at 7500rpm/min in a 4 ℃ centrifuge for 5min, discarding the supernatant, and repeating the 75% alcohol cleaning and centrifuging operation;
(5) drying the obtained RNA precipitate at room temperature, adding 30ul of RNase-free water when the RNA precipitate is transparent or semitransparent, repeatedly blowing and beating, subpackaging in a spectrophotometer for detection, and storing at-80 ℃.
Step 3.2.2: synthesizing cDNA by reverse transcription, adding water, a primer, a template RNA, dNTP, Buffer and reverse transcriptase with corresponding volumes according to the requirements of a commercial reverse transcription kit, setting a reverse transcription program according to the instruction, and amplifying to obtain the cDNA.
Step 3.2.3: designing and synthesizing a giant panda placental mesenchymal stem cell surface marker gene primer, and identifying whether the giant panda placental mesenchymal stem cell surface marker gene primer is expressed or not through qRT-PCR; the total RNA of the cultured cells in the step 3.2.1 and the cDNA reverse transcribed and synthesized in the step 3.2.2 are utilized to identify the expression stem cell marker genes CD34, CD90, SCFR and SOX-2 of the giant panda placenta mesenchymal stem cells by RT-PCR, and the sequences of primers are used to refer to the table 1.
TABLE 1 giant panda placenta mesenchymal stem cell surface marker gene primer sequence
Figure BDA0003575199330000081
3.3: inducing differentiation and identifying the cells,
3.1: determination of osteogenic Induction culture results
After the placenta mesenchymal stem cells are induced in an osteogenic differentiation culture medium for 21 days, the formation of a mineralized matrix is observed by alizarin red staining (figure 3), wherein the osteogenic differentiation culture medium is formed by adding 10% FBS, 0.1 mu M dexamethasone, 10mM beta-glycerophosphate and 2 mu M ascorbic acid into a basic culture medium, and the formation of the mineralized matrix can be observed by alizarin red staining.
3.2: determination of adipogenic Induction culture results
After the placenta mesenchymal stem cells are induced in a adipogenic differentiation culture medium for 21-28 days, lipid vacuoles can be observed after oil red O staining (figure 4), wherein the adipogenic differentiation culture medium is prepared by adding 10% FBS, 0.5mM 3-isobutyl-1-methylxanthine, 1 mu M dexamethasone, 0.5mM rosiglitazone and 10 mu g/mL insulin into a basic culture medium.
3.2: determination of chondrogenic induction culture results
After the placenta mesenchymal stem cells are induced in a chondrogenic differentiation culture medium for 21-28 days, the endogenic acid mucopolysaccharide in the cartilage tissue can be observed after the cells are stained by Alisin blue (figure 5), and the chondrogenic differentiation culture medium is formed by adding 10% FBS, 1% TGF-beta, 0.1 mu M dexamethasone, 3 mu M ascorbic acid, 1 mu M proline and 1 mu M sodium pyruvate into a DMEN culture solution.
And 4, step 4: separating and culturing the cultured placenta mesenchymal stem cells; the specific operation is as follows: when the cells are frozen, the gradient cooling is carried out, the cooling speed is-1 to-2 ℃/min when the freezing is started, the speed can be accelerated when the temperature is lower than-25 ℃, and the cells are transferred to liquid nitrogen for storage after the temperature is reduced to-80 ℃. The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (5)

1. A separation and culture method of giant panda placenta mesenchymal stem cells is characterized in that: the method comprises the following steps:
step 1: aseptically collecting giant panda placenta;
step 2: primarily separating giant panda placenta mesenchymal stem cells by adopting a collagenase digestion method, and culturing the separated tissues in a culture dish;
and 3, step 3: performing cell morphological characteristic identification, surface marker identification and induced differentiation identification on the placenta mesenchymal stem cells cultured in the step 2;
and 4, step 4: and (4) freezing and storing the cultured and passaged placenta mesenchymal stem cells, and taking out the placenta mesenchymal stem cells for cell recovery when in use.
2. The method for separating and culturing giant panda placental mesenchymal stem cells according to claim 1, wherein the method comprises the following steps: the specific operation of the step 1 is as follows:
step 1.1: storing the naturally delivered panda placenta in physiological saline containing 1% double antibody at 25 ℃, and transporting to a laboratory within 6h for primary cell separation, wherein the 1% double antibody is 100U/mL penicillin and 100U/mL streptomycin;
step 1.2: transferring the placenta tissue to a culture dish added with 75% alcohol in an ultra-clean workbench, soaking for 30s, taking out, washing with normal saline for 5-10 times, then soaking in 3-5% of triantion-containing normal saline for washing for 1min, transferring the placenta tissue to a new culture dish, and repeatedly soaking and washing with the 3-5% of triantion-containing normal saline for 10-15 times, wherein the triantion is penicillin, streptomycin and amphotericin;
step 1.3: step 1.2 after the wash was complete, the tissue was transferred to DMEN medium containing 1% double antibody, 20% fetal bovine serum.
3. The method for separating and culturing giant panda placental mesenchymal stem cells according to claim 2, wherein the method comprises the following steps: the specific operation of the step 2 is as follows:
step 2.1: cutting panda placenta tissue of step 1.3 into pieces of 1mm by using sterilized ophthalmic scissors3Adding 0.25% IV collagenase for digestion and blow beating for 40min, centrifuging at 1100rpm for 6min, removing supernatant, adding 1% double antibody and 20% fetal calf serum containing DMEN culture solution suspension cells, and transferring to a culture dish for culture;
step 2.2: observing the growth state of the cells every day, replacing the fresh culture medium in time, and carrying out digestion subculture by using 0.25% pancreatin diluted by 3-5 times when the cells grow to 80% confluence.
4. The method for separating and culturing giant panda placental mesenchymal stem cells according to claim 3, wherein the method comprises the following steps: the step 3 comprises the following steps:
3.1: cell morphological characterization
The placenta mesenchymal stem cells should show the adhesion capacity to a culture dish in the growth process, the cells are in a fusiform flat shape, the protrusion of a central nucleus is clear, the boundary is not obvious, and clear cell myofilament structures can be observed under a high power microscope;
3.2: surface marking identification
Step 3.2.1: extracting total RNA, collecting placenta mesenchymal stem cells, conducting Trizol lysis and room-temperature blowing for 5min, adding chloroform for centrifugation and layering, collecting a water sample layer, reducing the RNA through isopropanol precipitation, and extracting to obtain RNA;
step 3.2.2: the cDNA is synthesized by reverse transcription,
step 3.2.3: designing and synthesizing a giant panda placental mesenchymal stem cell surface marker gene primer, and identifying whether the giant panda placental mesenchymal stem cell surface marker gene primer is expressed or not through qRT-PCR;
3.3: and (3) induced differentiation identification, which comprises osteogenic induction culture result determination, adipogenic induction culture result determination and chondrogenic induction culture result determination.
5. The method for separating and culturing giant panda placental mesenchymal stem cells according to claim 4, wherein the method comprises the following steps: the specific operation of the step 4 is as follows: when the cells are frozen, the gradient cooling is carried out, the cooling speed is-1 ℃/min to-2 ℃/min when the freezing is started, the speed can be increased when the temperature is lower than-25 ℃, and the cells are transferred to liquid nitrogen for storage after the temperature is reduced to-80 ℃.
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