Ladinsky, Mark; Howell, Kathryn E. (2021). CIL:12941, Rattus rattus, glandular epithelial cell, milk secreting cell, mammary alveolar cell. In Cell Image Library. UC San Diego Library Digital Collections. Dataset. https://doi.org/10.6075/J03N22GS

Immunoelectron microscopy of mammary gland tissue from lactating rats investigating potential structural interactions between mature lipid droplets, as indicated by peripheral labeling with adipophilin (smaller gold particles) and elements of the trans-Golgi network, identified by TGN38 (a transmembrane trans-Golgi protein) staining (larger gold particles). Note that trans‐Golgi cisternae in lactating mammary cells contain large amounts of casein and other milk proteins and are grossly expanded due to the osmolarity of the secreted fluid.

• 2021

• Howell, Kathryn E.
• Ladinsky, Mark

Tissue was processed for immunoelectron microscopy using a modified Tokuyasu method. Briefly, minced tissue was fixed in 4% paraformaldehyde containing 5% sucrose and 100 mM HEPES and infiltrated with PBS containing 2.1 M sucrose over 10 h, with repeated solution changes. Fixed tissue was transferred to an aluminum cryosectioning stub (Ted Pella, Inc., Redding, CA) and immediately frozen in liquid nitrogen. Semithin (90 nm) cryosections were cut at -110C with an UltraCut UCT/FCS cryomicrotome (Leica), using a diamond knife (Diatome) and transferred to a Formvar-coated, carbon-coated, glow-discharged 100-mesh copper-rhodium electron microscopy grid. Following blocking of nonspecific antibody binding sites with 10% calf serum in PBS, the sections were labeled by sequential incubation with antibodies to adipophilin (guinea pig anti-adipophilin) and TGN38 (mouse monoclonal 2F7) and colloidal gold-conjugated secondary antibodies (15 nm anti-mouse, 10 nm anti-guinea pig; Ted Pella Inc., Redding, CA) and then negatively stained and embedded with 1% uranyl acetate, 1% methylcellulose in distilled water. Samples were viewed in a Philips CM10 electron microscope, and images were collected digitally. Magnification 15,500 X. See Ladinsky and Howell (2007) for more information on methods used.

Preparation: cryostat-sectioned tissue; formaldehyde fixed tissue; embedded tissue; methylcellulose embedded
Relation to intact cell: sectioned tissue
Item type: recorded image
Imaging mode: transmission electron microscopy (TEM); illumination by electrons; detection of electrons
Parameter imaged: electron density
Source of contrast: differences in adsorption or binding of stain; distribution of a specific protein
Visualization methods: gold; uranyl salt; primary antibody plus labeled secondary antibody
Processing history: unprocessed raw data
Data qualification: Raw;spatialmeasurements;intensitiesquantitation

• Cell Image Library Group ID: 9579

• Rattus rattus

• Glandular epithelial cell
• Lipid particle
• Mammary alveolar cell
• Milk secreting cell
• Mitochondrion
• Smooth endoplasmic reticulum
• Trans-Golgi network

• Lactation
• Lipid storage
• Protein binding
• Secretion

• data
• image

• No linguistic content; Not applicable

Samplenumber: 12941

Doi: https://doi.org/10.6075/J03N22GS

Source data

• Source Record in the Cell Image Library: https://doi.org/10.7295/W9CIL12941

Reference

• Ladinsky, MS and KE Howell (2007): http://www.ncbi.nlm.nih.gov/pubmed/17327173

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2022-08-12