Filipin-sterol complexes in molluscan gill ciliated epithelial cell membranes: intercalation into ciliary necklaces and induction of gap junctional particle arrays
| Autor: | M. J. Good, R E Stephens |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Gills
animal structures Histology Septate junctions Biology Cell junction Filipin Ciliary necklace Epithelium Pathology and Forensic Medicine Cell membrane chemistry.chemical_compound polycyclic compounds medicine Animals Freeze Fracturing Cilia Cilium Cell Membrane Gap junction Cell Biology Anatomy Microscopy Electron Sterols Intercellular Junctions Membrane medicine.anatomical_structure chemistry Mollusca Biophysics lipids (amino acids peptides and proteins) sense organs |
| Zdroj: | Cell and Tissue Research. 262:301-306 |
| ISSN: | 1432-0878 0302-766X |
| DOI: | 10.1007/bf00309885 |
| Popis: | Freeze-fracture electron microscopy has been used in conjunction with the antibiotic filipin to investigate possible differences in the distribution of sterols in ciliary and somatic cell membranes of scallop and mussel gill epithelial cells. Contrary to previous reports, we find that filipin-sterol lesions can occur among the strands of the ciliary necklace but they are partially excluded from the smooth neck region above the necklace where the membrane is tightly apposed to the axonemal microtubules. No obvious differences in filipin-sterol lesions occur in the membranes of mussel gill cilia of varying mechanical sensitivity. Although abundant in the apical plasma membrane, filipin-sterol complexes are rare within the membranes of microvilli. Filipin-sterol lesions form outside the loosely parallel particle strands of septate junctions, sometimes increasing their relative orderliness. At sufficiently high density, filipin-sterol protrusions within the plasma membrane result in mass aggregation of gap junctions, possibly through recruitment of unorganized connexons. |
| Databáze: | OpenAIRE |
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