Organotial小鼠正常乳腺类器官培养基试剂盒

I. Pre-Organization Processing

1 Experimental materials

Primary buffer needs to be prepared in advance B （ 4℃ Pre-cooling), tissue preservation solution E Sampling tube, tissue transport box, ice pack.

2 Organization acquisition and transportation

Tissue sampling and transportation are the first and most easily overlooked steps in the successful construction of organoids. Improper preservation of tissues in the early stages can lead to problems such as poor cell activity, contamination, and few effective cells, reducing the success rate of organoid construction.

The tissue should be in vitro 30min Place tissue preservation solution inside E , primary buffer B cleaning 3-5 Next, the blood on the tissue surface is washed clean and placed in tissue preservation solution. E In the sampling tube 4℃ Cryogenic storage and transportation ( 72h inside).

II. Primary organoid culture (with 24 (Taking orifice plates as an example)

1 Experimental materials

Primary buffer needs to be prepared in advance B （ 4℃ ), primary tissue digestive juice C （ 37℃ ), matrix glue (in advance 24h Put in 4℃ Refrigerator thawing), rat mammary gland organoid culture medium A (Room temperature or 37℃ ), tweezers ( 10㎝ ), pointed ophthalmic surgical scissors / Surgical blade, disposable 60mm Petri dishes, 1.5mL/15mL/50mL centrifuge tube, 100㎛ a cell screen, 3mL pasteurized straw /1000ul pipetting gun, 24 Well cell culture plate, metal ice box.

2 Construction of rat mammary gland organoids

2.1 Organizational processing

It is recommended that the rat mammary gland tissue after sampling be 2–8℃ Store and transport under conditions, and quickly transfer to a clean laboratory for the experimental process of mouse mammary gland organoid construction. Organize photography and register detailed information.

（ 1 Tissue cleansing

After the sampling tube is sterilized, the tissue is removed from the ultra-clean table, placed in a petri dish, and primary buffer is added. B , use 3mL pasteurized straw or 1000ul The pipette gun is blown and cleaned, and the cleaning operation is repeated three or more times.

（ 2 Dissociation and digestion of tissues

Tissue impurities are removed with ophthalmic scissors or a surgical blade, and the forceps are transferred to 1.5mLEP In the tube, ophthalmic scissors are used to further mechanically dissociate the tissue into a volume of approximately 1~3mm³ The tissue block was transferred to 15mLEP In the tube, add 5mL primary tissue digestive fluid 37℃ oscillation digestion 15-25min 。 Each digestive process 10min The tissue digestion was observed under a microscope. A small amount of digestive juice was taken and observed under the microscope, and a larger amount was observed. 70μm The following cell clusters or individual cells are followed by the next step. The degree of tissue digestion is shown in Figure 1.

If the amount of tissue is too small or the biopsy tissue is used 1mL primary tissue digestive fluid C In 1.5mLEP Tubular digestion.

Figure 1. Tissue digestion into more cell clusters or more single cells

（ 3 ) Tissue filtration

After digestion is complete, add 3 Double the volume of primary buffer B Digestion is terminated, and the digestive tissue mixture passes through. 100μm Cell sieve filtration with pore size, continue with 10-20ml primary buffer B Rinsing the tissue to collect more tissue mass cells, 300g enrichment centrifugation 5min Abandoning the supernatural; use 8-10ml primary buffer B Resuspend the centrifugal precipitate (remove more impurities), 300g enrichment centrifugation 5min They abandoned their superiors.

If the cell pellet contains red blood cells, add 1-2mL erythrocyte lysate 1-2min Then, dilute to 10mL ， 300g enrichment centrifugation 5min They abandoned their superiors. Organoid culture was performed directly when there was too little sedimentation or no red blood cells.

（ 4 Organoid culture

Observe the volume of cell pellets collected by centrifugation, and add 25 Double the volume of matrix glue is resuspended, forming 3D Cultivate the spatial structure to avoid bubbles during the resuspension process. The cell pellet volume is shown in Figure 2. Add the cell pellet volume according to the figure. 300ul 、 250ul 、 150ul 、 100ul Matrix glue.

Figure 2 Cell pellet volume

24 well cell culture plate according to 25ul-30ul/ Dispensing adhesive through holes The matrix adhesive is maintained throughout the 0-4℃ operation under conditions 。 cell culture plate placement 37℃ Incubator 10-15min After the matrix glue solidifies, 24 well cell culture plate addition per well 750μl Mouse mammary organoid culture medium A Stand (at room temperature) 37℃ Incubator culture.

III. Organoid subculture (with 24 (Taking orifice plates as an example)

1 Experimental materials

passage buffer G （ 4℃ ), organoid passage digestive fluid D (Room temperature or 37℃ ), matrix glue (in advance 24h Put in 4℃ Refrigerator thawing), rat mammary gland organoid culture medium A (Room temperature or 37℃ ）、 1.5mL/15mL centrifuge tube, 24 Well cell culture plate, ice box.

2 Organoid passage

Select suitable organoids for passage, generally after about a week of growth, microscope 10X You can see more below 20 Organoids, or size 100-200㎛ Organoids.

Aspirate off the medium and add an equal volume of passage buffer to each well G The pipette gently blows away the matrix glue, collecting it from... 15mL In the centrifuge tube, each 6-8 The hole is transferred to a centrifuge tube, 4℃ standing 10-15min 。

2.1 Organoid digestion

The need for digestive passaging is determined based on the growth of the organoid. After centrifugation, if there is little precipitation at the bottom of the tube, no cells are found, and the matrix glue is not delaminated, it can be resuspended again to increase the centrifugal force and centrifuge again. 。

When the number of organoids is insufficient or the volume is small, 300g centrifuge 5min Abandon the Shangqing Dynasty

When the number of organoids is high or the volume is large, 300g centrifuge 5min Discard the supernatant, and you can choose digestive juice digestion or mechanical digestion.

Digestive juice digestion: Add 1-2mL organoid passage digestive fluid D After the cell pellet is blown out, it is digested at room temperature. 2-3min Blow it every minute, each time... 20 Observe under a microscope until digestion reaches (Figure 3). A-B It can be stopped when in the ) state. Add 3 Passage buffer with twice the volume of organoid digestive fluid G Termination of digestion, 300g centrifuge 5min Abandon the Shangqing Dynasty.

Figure 3: Degree of passage digestion of organs

2.2 Passage organoid culture

Observe the volume of organoid pellets collected by centrifugation; if there is very little pellet, it can be reserved. 1 Dispense the supernatant with twice the precipitation volume; a large amount of precipitated supernatant can be absorbed. Add... 25 The organoids were resuspended in an amount of matrix gel twice the organoid pellet volume. The volume of matrix rubber can be referenced. “ Organoid primary culture operation Figure 2 ” 。

24 well cell culture plate according to 25ul-30ul/ Dispensing adhesive through holes The matrix adhesive is maintained throughout the 0-4℃ operation under conditions 。 cell culture plate placement 37℃ Incubator 10-15min After the matrix glue solidifies, 24 well cell culture plate addition per well 750μl Mouse mammary organoid culture medium A Stand (at room temperature) 37℃ Incubator culture.

IV. Cryopreservation of organoids (with 24 (Taking orifice plates as an example)

1 Experimental materials

passage buffer G （ 4℃ ), organoid cryopreservation solution F （ 4℃ ）、 15mL Centrifuge tube, cell cryopreservation tube, program cooling box, pipette gun.

2 Organoid cryopreservation

Organoids that are temporarily unused should be frozen and stored in a low-temperature environment.

Aspirate off the medium and add an equal volume of passage buffer to each well G The pipette gently blows away the matrix glue, collecting it from... 15mL In the centrifuge tube, each 6-8 The hole is transferred to a centrifuge tube, 4℃ standing 10-15min 。 300g centrifuge 5min Discard the supernatant and add it every three holes. 2mL organoid cryopreservation fluid F Gently blow and mix well, then transfer to cell cryopreservation tubes. Each tube... 1mL 。

Mark the information, place it in the program cooling box, and move it to... -80℃ In the refrigerator, 48h Afterwards, it was placed in a liquid nitrogen tank for storage. Or put in 4℃ refrigerator 40min Then, put in -20℃ in the refrigerator 2h , move to -80℃ In the refrigerator, 48h Afterwards, it was placed in a liquid nitrogen tank for storage.

V. Organoid resuscitation culture (with 24 (Taking orifice plates as an example)

1 Experimental materials

passage buffer G Mouse mammary gland organoid culture medium A Matrix glue (in advance) 24h Put in 4℃ (Refrigerator melting) 24 well cell culture plates, ice boxes, 15mL Centrifuge tube, water bath, 3mL pasteurized straw / Pipetting gun.

2 Organoid resuscitation culture

（ 1 The frozen organoids were removed from the cryogenic environment and quickly placed in... 37℃ Thawing in a water bath. During the water bath thawing process, the cryopreservation tube needs to be gently shaken to ensure that the cryopreservation liquid is completely thawed in a short time.

（ 2 During the organoid dissolution process, to 15mL Advance addition to the centrifuge tube 10mL Passage buffer for backup;

（ 3 ) Use 1mL Gently pipette the cryopreserved fluid, slowly add it to the prepared buffer, and gently blow with the pipette. 2-3 next time, 300g centrifuge 5min Abandon the Shangqing;

（ 4 Add approximately [amount missing] to the 10mL Passage buffer, gently blown with a pipette 2-3 Next (the precipitate can be blown away), 300g centrifuge 5min Abandon the Shangqing;

（ 5 ) Use 200μL Carefully pipette the residual supernatant and add... 200-400μL Matrix glue (usual: resuscitation of one tube of cryopreserved organoids) 200μL Matrix glue, resuscitation 2 Use of organoids cryopreserved in tubes 400μL The matrix glue is resuspended (to avoid bubbles). 24 well cell culture plate according to 25μL-30μL Adhesive is dispensed per well, and the matrix adhesive is maintained at the same level 0-4℃ Operate under conditions;

（ 6 ) Cell culture plate placement 37℃ Carbon dioxide incubator 10-15min After the matrix gum has set, add to each well. 500-750μL Organoid medium (in advance) 37℃ (Preheating) for cultivation.

VI. Use of matrix adhesive

In 2–8℃ The matrix glue was thawed overnight under ambient conditions. When using matrix glue, keep it in an ice box to prevent premature setting. Matrix glue in 37℃ Below 20 A gel formed within minutes.

1 Characteristics of matrix adhesive:

1 Mouse mammary gland organoid culture medium A In 4℃ Can be saved 3 Months after receiving the goods 4℃ Save, suggest 1 It should be used within a month; it is not recommended to store it for a long time without use. -20℃ Store to avoid repeated freezing and thawing exceeding 2 Next 。

2 Tissue preservation solution E Primary tissue digestive juice C It contains nutrients that maintain cell activity. To maintain the activity of the reagent nutrients, it is recommended not to store them for a long time. -20℃ Store to avoid repeated freezing and thawing exceeding 2 Next 。