Immunocytochemical demonstration of a lipid droplet-specific capsule in cultured Leydig cells of the golden hamsters

Tsorng Harn Fong, Seu Mei Wang, Huai San Lin

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

In this report, we provide direct evidence for the presence of a lipid droplet-associated capsule in hamster steroidogenic Leydig cells by using a monoclonal antibody A2. Leydig cells are characterized by containing many lipid droplets and having 3β-hydroxysteroid dehydrogenase activity. Immunofluorescence staining with this antibody demonstrated a rim or capsule surrounding the lipid droplets in Leydig cells, a pattern not seen with anti- vimentin antibody. Immunogold labelling confirmed ultrastructurally that antibody binding was distributed on the lipid droplet surface. In order to investigate the possible function of the capsule, we examined the morphological changes induced in the capsule following stimulation with LH or dibutyryl cAMP; the fluorescent intensity of the capsule was seen to gradually decrease, accompanied by a decrease in number and size of lipid droplets, and the response to both reagents was time- and concentration- dependent. We thus conclude that hormonal stimulation resulting in the detachment of certain capsular proteins from the surface of lipid droplets is mediated via the cAMP signaling pathway and may allow cholesterol ester hydrolytic enzyme direct access to its substrate in the lipid droplet.

Original languageEnglish
Pages (from-to)366-373
Number of pages8
JournalJournal of Cellular Biochemistry
Volume63
Issue number3
DOIs
Publication statusPublished - Dec 1 1996
Externally publishedYes

Fingerprint

Leydig Cells
Mesocricetus
Capsules
Cultured Cells
Demonstrations
Lipids
3-Hydroxysteroid Dehydrogenases
Antibodies
Cholesterol Esters
Vimentin
varespladib methyl
Cricetinae
Fluorescent Antibody Technique
Lipid Droplets
Anti-Idiotypic Antibodies
Labeling
Monoclonal Antibodies
Membrane Proteins
Staining and Labeling
Enzymes

Keywords

  • capsule
  • immunocytochemistry
  • Leydig cell
  • lipid droplet
  • monoclonal antibody

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology

Cite this

Immunocytochemical demonstration of a lipid droplet-specific capsule in cultured Leydig cells of the golden hamsters. / Fong, Tsorng Harn; Wang, Seu Mei; Lin, Huai San.

In: Journal of Cellular Biochemistry, Vol. 63, No. 3, 01.12.1996, p. 366-373.

Research output: Contribution to journalArticle

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