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  • Cell isolation
  • Springer  (12)
  • Cell Press  (1)
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  • 1
    Publication Date: 2022-05-26
    Description: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Geisterfer, Z. M., Oakey, J., & Gatlin, J. C. . Microfluidic encapsulation of Xenopus laevis cell-free extracts using hydrogel photolithography. STAR Protocols, 1(3), (2020): 100221, doi:10.1016/j.xpro.2020.100221.
    Description: Cell-free extract derived from the eggs of the African clawed frog Xenopus laevis is a well-established model system that has been used historically in bulk aliquots. Here, we describe a microfluidic approach for isolating discrete, biologically relevant volumes of cell-free extract, with more expansive and precise control of extract shape compared with extract-oil emulsions. This approach is useful for investigating the mechanics of intracellular processes affected by cell geometry or cytoplasmic volume, including organelle scaling and positioning mechanisms. For complete details on the use and execution of this protocol, please refer to Geisterfer et al. (2020).
    Description: This work was made possible by an Institutional Development Award (IDeA) from the National Institute of General Medical Sciences of the National Institutes of Health under grant no. 2P20GM103432. It was also supported by additional funding provided by the NIGMS under grant no. R01GM113028, the NSF Faculty CAREER Program under award no. BBBE 1254608, Whitman Center fellowships at the Marine Biological Laboratory, and the Biomedical Scholars program of the Pew Charitable Trusts. We thank Drs. Aaron Groen and Tim Mitchison for their intellectual contributions and involvement in some of the pioneering experiments that set the foundation for this approach.
    Keywords: Biophysics ; Cell Biology ; Cell isolation ; Microscopy ; Model Organisms
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Methods in cell science 22 (2000), S. 63-66 
    ISSN: 1573-0603
    Keywords: Cell culture ; Cell isolation ; Clone ; Method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Due to the heterogeneous nature of animal organs, primary cell cultures potentially contain more than one type of cell. Interpretation of data arising from studies using these mixed cultures can lead to difficulties, because it may not be possible to ascertain which of the cell types present may have responded to a given treatment. While a number of procedures have been used to enrich the cell population of interest, many scientists have resorted to cloning of cells in order to insure the purity of cell cultures. Three major strategies have been used to produce clones, namely, the dilution technique, cloning ring technique, and robotic cell transfer. Successful cloning is dependent on optimization of attachment substrata, basal media composition, serum source, and growth factor/hormone additions to support proliferation of the cell type at clonal (low) density.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 280 (1995), S. 401-405 
    ISSN: 1432-0878
    Keywords: Calcospherites ; Cell isolation ; Hepatopancreas ; Spermatophores ; Carcinus maenas (Crustacea)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In a previous paper, we described and discussed the possible functions of calcospherite-rich cells (R* cells) in the digestive gland of the shore crab, Carcinus maenas. We recently realised that electron micrographs in this publication presented neither typical R* cells nor their calcium phosphate granules. Indeed, our pictures showed spermatophores (filled with typical spermatozoa) that had contamined hepatopancreatic cell suspensions. As the present study indicates, this contamination is difficult to detect by optical microscopy because unstained R* cells closely resemble spermatophores. However, morphological differences between these cell types appear clearly when observed by electron microscopy. The present paper describes a comparative study of cell populations isolated from female digestive glands; it validates our previous results obtained with male hepatopancreas and suggests a low containation of those male cell fractions by spermatophores.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 280 (1995), S. 401-405 
    ISSN: 1432-0878
    Keywords: Key words: Calcospherites ; Cell isolation ; Hepatopancreas ; Spermatophores ; Carcinus maenas (Crustacea)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. In a previous paper, we described and discussed the possible functions of calcospherite-rich cells (R* cells) in the digestive gland of the shore crab, Carcinus maenas. We recently realised that electron micrographs in this publication presented neither typical R* cells nor their calcium phosphate granules. Indeed, our pictures showed spermatophores (filled with typical spermatozoa) that had contamined hepatopancreatic cell suspensions. As the present study indicates, this con-tamination is difficult to detect by optical microscopy because unstained R* cells closely resemble spermatophores. However, morphological differences between these cell types appear clearly when observed by electron microscopy. The present paper describes a comparative study of cell populations isolated from female digestive glands; it validates our previous results obtained with male hepatopancreas and suggests a low containation of those male cell fractions by spermatophores.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 277 (1994), S. 159-167 
    ISSN: 1432-0878
    Keywords: Cell isolation ; Encapsulation ; Phagocytosis ; Phenoloxidase ; Immunocytes, invertebrate ; Pseudoplusia includens (Insecta)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Hemocytes collected from larvae of Pseudoplusia includens (Lepidoptera: Noctuidae) were separated by centrifugation on Percoll cushions. The procedure resulted in 95% purity of plasmatocytes and greater than 99% purity of granular and spherule cells. Medium supplemented with chicken serum enhanced cell viability and promoted spreading of plasmatocytes. Cell-free plasma and medium preconditioned by plasmatocytes or granular cells stabilized cells in vitro and also accelerated spreading of plasmatocytes relative to medium supplemented with chicken serum. Oenocytoids were the only morphotype that exhibited endogenous phenoloxidase activity, while granular cells and plasmatocytes were the only cells that endocytosed fluorescent beads in vitro. Granular cells and plasmatocytes ingested fluorescently labelled beads, both in mixed populations of hemocytes and after separation. Plasmatocytes were the only morphotype that encapsulated large foreign targets in vitro following separation. Separated granular cells attached and spread on the surface of foreign targets but never formed a multilayered capsule.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 271 (1993), S. 47-57 
    ISSN: 1432-0878
    Keywords: Brush cells ; Cell isolation ; Stomach ; Polarity ; Light microscopy ; Electron microscopy ; Rat (Wistar)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The brush cells (BC) are highly polarized elements occurring in epithelia of endodermal origin. They have a preferential topographical distribution in the organs in which they reside. In the stomach of the rat, BC prevail near the transitional zone separating the forestomach from the glandular stomach. Thus, a method was developed to isolate and recover BC from this organ with the aim of investigating the changes they may undergo after dissociation. Strips of the rat stomach were severed from the very proximal border of the glandular region and incubated in Hanks' balanced salt solution containing pronase. After sedimentation of the dissociated cells (crude sediment containing all stomach epithelial cell types) two successive cell fractions were prepared on preformed Percoll gradient in an attempt to enrich BC in a defined layer. BC were recovered in a fraction at a density close to 1.03 g/ml where they represented about 2% of all cells. The isolated BC changed their form from columnar to pear-shaped; however, they maintained their structural polarity over 2 h as demonstrated by light microscopy, transmission-and scanning-electron microscopy. The fine structure of BC was always satisfactorily preserved. Maintenance of the structural polarity of isolated BC is contrary to the general rule according to which all conventional epithelial cells examined to date lose their polarity after isolation. This result is discussed in relation to morphological findings in isolated sensory cells (hair cells, photoreceptor cells) leading to the suggestion that BC are more similar to these than to conventional epithelial cells.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0878
    Keywords: Stomach ; Cell isolation ; Cytology ; Mucous cells ; Chief cells ; Parietal cells ; Endocrine cells ; Pig ; Guinea pig
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Functional in vitro studies with isolated gastric mucosal cells require cytological identification of different cell types in suspension or primary culture. Since suitable techniques have not been well established, different staining methods for the discrimination of dispersed pig and guinea pig gastric cells have been developed on the basis of modified previous protocols for enzymatic cell dispersion. Chief and parietal cells were visualized by combined periodic acid-Schiff stains. Surface mucous and mucous neck cells were identified by affinity-labelling, using lectins with selective staining properties in situ. Two of the lectins were found to be specific markers for gastric polymorphonuclear cells. The following vital tests were found to be useful: succinic dehydrogenase for parietal cells, Nile blue/brilliant cresyl blue stains for chief cells, and different phagocytosis assays for endothelial cells and gastric phagocytes. Endocrine cells were characterized by immunocytochemistry using specific antibodies against gastrin, somatostatin, histamine and serotonin. The same technique using a vimentin antibody was performed for the identification of fibroblasts. Proliferation of mucosal cells in primary culture was monitored by the incorporation of bromo-deoxyuridine, which was subsequently detected by a monoclonal antibody.
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  • 8
    ISSN: 1432-0878
    Keywords: Calcospherite ; Cell isolation ; Hepatopancreas ; Glucose-6-phosphatase ; Carcinus maenas (Crustacea)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary R*-cells of the digestive gland of Carcinus maenas have been investigated functionally and morphologically. A comparison of the capacity of separated cell suspensions to synthesize glycogen gave support to the hypothesis that R and R* cells belong to the same cell line. The unexpected observation of R* cells in gastric juice suggests that their release could represent a mode of redistribution of carbohydrate stores when the feeding activity of the crab is lower. Under electron microscopy, the calcospherites of R* cells appeared to be surrounded by multiple membranous layers, and displayed tubular and vesicular structures in their core. High glucose-6-phosphatase (G6Pase) activity in the subcellular fraction that is enriched in calcospherites suggests that these membranes are derived from the endoplasmic reticulum, via a process in which the enzyme plays a key role. We propose that this is the way by which the R cell differentiates into R* cell.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 263 (1991), S. 589-592 
    ISSN: 1432-0878
    Keywords: Pineal organ ; Cell isolation ; Nerve cells ; Photoreceptor cells ; Supporting cells ; Lampetra japonica (Cyclostomata)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Photoreceptor cells, nerve cells and supporting cells were dissociated from the pineal organ of the river lamprey, Lampetra japonica, by the use of 10 U/ml papain solution at 28° C for 20 min, followed by repeated trituration. With the aid of Nomarski interferencecontrast optics, photoreceptor cells, nerve cells and supporting cells were readily identified. Electron-microscopic examination revealed that isolated photoreceptor cells display an outer segment endowed with a few lamellar disks and connected to the inner segment (ellipsoid) via a connecting cilium. The structural features of the dissociated photoreceptor and supporting cells strongly resemble the morphology of the respective cellular elements in situ. We succeeded in culturing dissociated cells for time periods up to 48 h when the procedure described in detail was applied.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 250 (1987), S. 543-549 
    ISSN: 1432-0878
    Keywords: Olfactory sensilla ; Sensory neurons ; Morphogenesis ; Cell isolation ; Antheraea polyphemus, Antheraea pernyi (Insecta, Lepidoptera)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary By combined enzymatic and mechanical treatment, it was possible to dissociate the sensory epithelium of developing antennae of male Antheraea polyphemus and A. pernyi silkmoths from the stage of separation of the antennal branches up to the early stages of cuticle deposition. Large numbers of entire developing trichoid sensilla were isolated. These are characterized by a large trichogen cell with a long apical, hair-forming process and a large nucleus. A cluster of 2–3 sensory neurons, enclosed by the thecogen cell, is situated in the basal region. The dendrites run past the nucleus of the trichogen cell into the apical process from which they protrude laterally. The nuclei of the tormogen and a 4th enveloping cell can be distinguished near the base of the prospective hair. After further dissociation, only the neuron clusters remain, still enclosed by their thecogen cell and often attached to the antennal branch nerve via their axons. It is finally possible to disrupt the thecogen cells and the axons, leaving the sensory neurons with inner dendritic segments and axon stumps. The majority of these neurons can be expected to be olfactory.
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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 34 (1982), S. 480-487 
    ISSN: 1432-0827
    Keywords: Osteoclast ; Cell isolation ; 1,25-Dihydroxycholecalciferol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Cell isolates containing multinucleate osteoclasts were obtained from longitudinally split fetal rat long bones by treatment with testicular hyaluronidase. The total yield of osteoclasts and the osteoclast enrichment of the isolate were increased if the intact bones were first cultured for 72 h. Even greater enhancement was obtained if the bones were treated with 1,25-dihydroxycholecalciferol [1,25(OH)2D3] during the culture period. This technique resulted in a cell population containing approximately 15% osteoclasts in yields greater than 50 osteoclasts per long bone. The yield of osteoclasts and the percentage of osteoclasts correlated well with the extent of bone resorption induced by 1,25(OH)2D3. The effectiveness of several isolation procedures was compared using the 1,25(OH)2D3-treated long bones. Conventional digestion with 1 mg/ml crude collagenase gave a much poorer yield of osteoclasts than simply agitating the split long bones. Hyaluronidase plus EDTA was not significantly different from EDTA alone. Even with milder procedures, however, the isolated osteoclasts were damaged as judged by their failure to exclude trypan blue. The osteoclasts are obviously very fragile cells. The isolation technique coupled with May-Grunwald-Giemsa staining permitted reliable determination of the median number of nuclei per osteoclast. This parameter was the same in uncultured bones or in bones cultured for 72 h in control media. Treatment with 1,25(OH)2D3 increased the nuclear number. At lower levels of bone resorption, nuclear number did not increase, but it was significantly greater in more highly resorbed bones.
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 211 (1980), S. 405-418 
    ISSN: 1432-0878
    Keywords: Intestine ; Mouse ; Cell isolation ; Enzymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Suspensions of sequentially isolated villus and crypt cells were obtained in order to study certain biochemical changes associated with differentiation of epithelial cells in the small intestine of the mouse. Microscopic observation of the various cell fractions reveals that the epithelial cells detach as individual cells or small sheets of epithelium from the tip to the base of the villus, whereas cells in the crypt regions are separated as entire crypt units. The isolated cells retain their ultrastructural integrity as judged by electron microscopy. Chemical characterization of the various fractions shows that the total cellular protein content, expressed in activity per cell, remains relatively constant throughout the villus region followed by a noticeable drop in the crypt zone. On the other hand, sharp variations in values of cell DNA content are observed in the crypt zone depending on the reference of activity being used. Activity profiles of several brush border enzymes confirm the biochemical changes that occur during the migration of cells from the crypt to the villus tip, as observed in other species, with maximum activity of sucrase in the mid-villus region, of glucoamylase, trehalase, lactase and maltase in the upper third region, and of alkaline phosphatase at the villus tip. Forty-eight-hour suspension cultures of cell fractions corresponding to cells at the base of the villus and crypt zones show a moderate decrease in protein and enzyme activities to approximately 70% of their original value, with DNA content remaining stable throughout the incubation period. The use of biochemical activities as indicators of cellular integrity during cell culture is discussed.
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  • 13
    Electronic Resource
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    Springer
    Cell & tissue research 200 (1979), S. 163-177 
    ISSN: 1432-0878
    Keywords: Gastrin cells ; Entero-endocrine cells ; Rat ; Cell isolation ; Pylorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A technique has been developed to obtain viable, isolated and enriched populations of gastrin cells (G-cells) from the rat stomach. Restricted tissue samples from a small area of the pyloric antrum known to be particularly rich in G-cells, were sequentially digested with pronase followed by mechanical agitation, to remove the epithelial cells. This technique resulted in a significant enrichment of G-cells (3–4 fold) since the surface epithelial cells and upper portions of the glands were discarded before the initial G-cell fraction was collected. These cells in suspension were then isolated from each other by gentle pipetting in a DNase containing solution and designated the crude preparation (CP). The G-cells were then purified further by separating the cells according to size by velocity sedimentation. The greatest concentration of G-cells (15–25 %) was found in the fraction containing cells with diameters of 10 to 12 μm. The effectiveness of the technique was evaluated by counting G-cells as identified by electron microscopy and immunofluorescence and assessing gastrin activity by radioimmunoassay. All three methods indicated that cell separation by gravity velocity sedimentation enriched the G-cell population 15–20 fold over their concentration in the CP. The combined techniques of selective pronase digestion followed by gravity velocity sedimentation resulted in an isolated cell preparation containing a 50–100 fold increase of G-cells over their normal distribution in the intact gastric mucosa. Since these isolated G-cells retain features indicating viability, their usefulness for in vitro studies is suggested.
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