33 results about "Cd34 positive cell" patented technology

The invention provides a preparation method of clinical application-level placental hematopoietic stem cells. The preparation method comprises the steps of pretreating a fresh delivered placenta immediately and then separating out umbilical arteries and umbilical veins, pouring a cleaning fluid into the chorionic vessels of the placenta and colleting the cleaning fluid after pouring, pouring an enzyme digestion fluid into the chorionic vessels of the placenta and digesting at 37 DEG C for 5-20min, pouring the collected fluid into the placenta and collecting the liquid after pouring, centrifuging the obtained fluid and re-suspending cells after removing the supernatant, and separating the resuspended cell suspension through a two-step process with hydroxyethyl starch and a lymphocyte separation medium to obtain the clinical application-level placental hematopoietic stem cells. The method is capable of increasing the number and the activity of the prepared placental hematopoietic stem cells and the content of CD34 positive cells, and the prepared placental hematopoietic stem cells are at the clinical application level and free of potential pathogenic contamination, and moreover, the method is low in preparation cost.

The invention relates to a method for preparing CD34 positive cells from umbilical cord mesenchymal stem cells. The method specifically comprises the following steps: (a) providing mesenchymal stem cells from an umbilical cord; (b) performing primary culture on the mesenchymal stem cells; (c) performing subculture on the mesenchymal stem cells; (d) in a subculture process, adding an inductive agent in a culture medium for inducing the mesenchymal stem cells; (e) obtaining the CD34 positive cells. The invention also relates to cell products of the CD34 positive cells, prepared through the method and application of the cell products. The method disclosed by the invention has excellent technical effects described in the description.

The invention relates to the technical field of biology, and discloses a preparation method of placenta hematopoietic stem cells. The method comprises the following steps: cleaning a pretreated placenta by injection with an irrigating solution; injecting an enzymolysis solution from the placenta artery to the placenta vein until the enzymolysis solution flows out, tying the placenta artery and vein, and standing; loosening the placenta artery and vein, injecting the irrigating solution from the artery, collecting all the liquid at the vein, centrifugating, taking the cell precipitate, recovering and purifying single karyocytes comprising hematopoietic stem cells sequentially by a hydroxyethyl starch process and an erythrocyte cracking process, and resuspending to obtain the placenta hematopoietic stem cells. The method improves the enzymolysis injection technique, selects multiple mutually-suitable components to constitute the novel enzymolysis solution which is used in the placenta hematopoietic stem cell preparation process, can mobilize the hematopoietic stem cells inside the placenta to quickly enter the blood circulation system within a short time, and enhances the single karyocyte quantity comprising hematopoietic stem cells, the living cell quantity and the CD34 positive cell quantity.

The invention provides a method for extracting hemopoietic stem cells from placentas, and especially relates to a method for extracting hemopoietic stem cells from placentas in a lavage manner. In one embodiment of the invention, the method comprises the following steps: 1, collecting the placentas; 2, carrying out initial inspection on the placentas; 3, pre-disinfecting the placentas; 4, detecting the placentas and maternal blood; 5, lavaging hemopoietic stem cells of the placentas; and 6, concentrating and purifying the hemopoietic stem cells. The method has the advantages presented in the specification, and a flow cytometer detection result of the hemopoietic stem cells obtained through the method shows that the hemopoietic stem cells have a very high percentage of CD34 positive cells.

The invention relates to applications of CAPE (Caffeic Acid Phenylethyl Ester) in culturing hematopoietic stem/progenitor cells in vitro. The CAPE with certain concentration is added in an in-vitro hematopoietic stem/progenitor cell expansion system, the ratio of the expanded human umbilical cord blood mononuclear cells or expanded hematopoietic stem/progenitor cells in CD34 positive cells is obviously increased, the total colony number is remarkably increased, so that the in-vitro expansion of the hematopoietic stem/progenitor cells can be effectively promoted, and the in-vitro expansion efficiency of the hematopoietic stem/progenitor cells can be enhanced.

The invention relates to the biotechnical field and discloses a preparation method for a placenta hemopoietic stem cell. The preparation method comprises the following steps: irrigating and cleaning a pre-processed placenta with an irrigating solution; irrigating a mobilizing agent from placental arteries until the mobilizing agent stops flowing from the placental veins and the placental arteries and veins are ligatured and stood; loosening the placental arteries and veins and grouting the same amount of mobilizing agent from the arteries, collecting all liquids from the veins, and centrifuging to get cell sediments; then, recycling and purifying single karyocyte comprising the hemopoietic stem cell through a hydroxyethyl starch process and a red blood cell lysis process in sequence, and re-suspending to obtain the placenta hemopoietic stem cell. According to the preparation method, the mobilizing agent irrigating process is improved, a plurality of mutually suitable components are selected to form a novel mobilizing agent for being applied to a preparation process of the placenta hemopoietic stem cell, the placenta hemopoietic stem cell inside the placenta can be mobilized and can quickly enter a blood circulating system, and the quantity of single karyocyte comprising the hemopoietic stem cell as well as quantity of living cells of the single karyocyte and quantity of CD34 positive cells is increased.

Disclosed is a method for stimulating revascularization in a subject comprising the steps of:

• • (a) administering erythropoietin to the subject;
  • (b) collecting peripheral blood mononuclear cells from the subject; and
  • (c) administering the collected peripheral blood mononuclear cells to a target site of the subject. Peripheral blood mononuclear cells, and particularly CD34-positive cells, are mobilized into the peripheral blood of a subject by the administration of erythropoietin to the subject. The method of the present invention is useful for the treatment of ischemic diseases, such as peripheral vascular disorder.

Disclosed are means of inducing neuroregeneration and/or neuroprotection in patients with damage to the nervous system. In one embodiment, placenta derived CD34 positive cells are administered to a patient suffering from a neurological injury, said cells administered alone, or in combination with endothelial progenitor cells that are derived from placental sources. In one embodiment cells are manipulated to decrease immunogenicity by means of gene-editing or RNA interference inducing means. In another embodiment, neuroprotection and/or neuroregeneration is achieved by administration of exosomes derived from placental stem cells.

The invention relates to a method for separating hematopoietic stem cells from umbilical cord blood and amplifying CD34 positive cells. The method comprises the following specific steps: separating hematopoietic stem cells from umbilical cord blood; purifying; separating by using a Ficoll separating solution; counting the CD34 positive cells by using a flow cytometer, diluting, inoculating and culturing; changing the solution and culturing; transferring the cells to new plates and culturing; evaluating the cell amplifying effect. The invention further relates to cell products containing the CD34 positive cells prepared by the method and application of the cell products. The method has excellent technical effects as described in the specification.

The invention belongs to the field of biotechnology, and particularly relates to a preparation method of placental hematopoietic stem cells. The preparation method comprises the following steps: (1) pretreatment of a placenta; (2) first lavage of the placenta; (3) second lavage of the placenta; (4) third lavage of the placenta; (5) mixing and centrifuging; (6) primary purification of the placenta;and (7) cryopreservation of hematopoietic stem cells. The preparation method can improve the separation quantity and cell activity of CD34 positive cells, the adopted reagents have no potential risks, and can be applied clinically, and the experimental cost is reduced.

The invention discloses a method for increasing the extraction rate of the CD34 positive stromal vascular fraction (SVF) in high-fat tissue. The method includes the steps that fat tissue is subjected to suspension with normal saline, centrifugation is carried out to remove an oil layer, sediment is repeatedly centrifuged, sediment obtained in the last time of centrifugation is crushed, and crushed tissue is obtained; then, a collagenase aqueous solution is added into the crushed tissue, oscillation is carried out at 37 DEG C for digestion, centrifugation is carried out after digestion is finished, and sediment, namely, the CD34 positive SVF is taken. By means of the method, low-concentration collagenase can be used for digestion, and the SVF containing high-ratio CD34 positive stem/progenitor cells is obtained from the fat tissue; the ratio of CD34 positive stem/progenitor cells in the SVF is larger than 24%, and more than 6.0*10<5> CD34 positive cells can be obtained from each milliliter of fat tissue.

[Problems] To provide a marker which is useful in diagnosing leukemia and a method of using the same.

[Means for Solving Problems] A method of detecting a leukemia cell which comprises detecting a CD34-positive cell being negative in DOCK180 expression from a blood specimen. According to this method, a DOCK180 expression pattern specific to a tumor cell in leukemia, in particular, acute leukemia is confirmed so that information which is useful in diagnosing leukemia and monitoring and determining the severity and degree of recovery of the same by a doctor can be obtained by a convenient procedure using blood specimens and thus provided.

The invention belongs to the technical field of biology and discloses an ASD (autism spectrum disorder) detection kit. Discoveries find that expression of CD34 positive cell ER beta in bone marrow andperipheral blood and related genes of the CD34 positive cell ER beta is closely related with production of ASD-like behaviors and can serve as markers of ASD for detection and pre-screening of ASD. The ASD detection kit can be used for clinically detecting and pre-screening ASD rapidly, sensitively and specifically, and effective preventing and intervention treatment measures can be taken for children patients with ASD according to detection results.

The present invention relates to cell capture assay for the selection of a high producer cell line expressing anti-CD34 antibodies that recognize the CD34 membrane-protein in the cell membrane. The monoclonal antibody secreted by the hybridoma cell line 9C5/9069 binds to human CD34 and is used to isolate stem cells. The DNA sequences encoding for the antibody heavy and light chain have been identified, isolated from the hybridoma cells and cloned into appropriate expression vectors. After co-transfection of the heavy and light chain genes into HEK293T or in CHO cells either conditioned medium or purified antibody were assessed for binding to CD34 protein located in the cell membrane in different cell capture assays. The binding of the antibody to CD34-positive cells could be shown with these assays for several cell lines.

An object of the present invention is to provide a method for more efficiently differentiating CD34⁺ cells derived from umbilical cord blood into megakaryocytic lineage cells and for generating platelets. Coculture of CD34⁺ cells derived from umbilical cord blood with immortalized stromal cells in the presence of cytokines has enabled cell proliferation up to the 100,000-fold level, which has been impossible to achieve to date.

The invention relates to a technology for promoting direct trans-differentiation of umbilical cord blood CD34 positive cells into mesenchymal stem cells, and belongs to the technical field of bioengineering. With the application of the genetic engineering technology provided by the invention, efficient direct trans-differentiation of the umbilical cord blood CD34 positive cells from hematopoietic stem cells can be promoted, so that iMSCs can be obtained; the hematopoietic stem cells, which are co-cultured with a certain composition for enough time, can be transformed into MSCs through trans-differentiation; the composition includes at least one transcription factor selected from OCT4, NANOG, MYCL1, SNAI1, SNAI2 and TWIST1; and the composition can also include one or more cell factors disclosed by the invention and other compounds. With the application of the technical method provided by the invention, transient expression of the related transcription factors in the umbilical cord blood CD34 positive cells can be achieved by virtue of a virus infection method, and in the combination with an MSCs inducing medium, 1*10<9> MSCs can be obtained from 1*10<6> umbilical cord blood CD34 positive cells through the trans-differentiation, and the iMSCs cells, obtained from the trans-differentiation, are represented in the form of the MSCs and can express surface markers of the MSCs cells, such as CD29, CD44, CD73 and CD90.

Nuclear reprogramming substances are contacted with a somatic cell and, after culture, cell population is fractionated based on the expression of Sca-1 or EpCam and CD34. By sorting Sca-1-negative CD34-negative cells or EpCam-positive CD34-negative cells, a cell population having high possibility of iPS cell formation can be selected. On the other hand, Sca-1-positive CD34-positive cells or EpCam-negative CD34-positive cells are useful as a source of myocardial cell or a progenitor cell thereof having a low risk of tumor formation.

The invention relates to a method of amplifying hematopoietic stem cells of umbilical cord blood in vitro and belongs to the technical field of biomedicines. The method amplifies the hematopoietic stem cells of umbilical cord blood in vitro by means of CBMC separation of a mononuclear cell of umbilical cord blood, CD34 positive cell enrichment and CD34 positive cell expansion, and the amplified hematopoietic stem cells of umbilical cord blood are detected relatively. According to the method provided by the invention, the hematopoietic stem cells of umbilical cord blood can be amplified in a multiple fold manner, and the cells meet the clinical application standard. By expansion in vitro, the quality of implanting the hematopoietic stem cells of umbilical cord blood for clinical use of an adult is met. No treatment methods affecting the cell state are employed, and a condition culture medium of mesenchymal stem cells is used for amplifying the hematopoietic stem cells. Compared with a control group, the method can raise the proportion of the D34 positive hematopoietic stem cells from 0.28% to 13.95%, and has a good application prospect.