These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.
Pubmed for Handhelds
PUBMED FOR HANDHELDS
Search MEDLINE/PubMed
Title: Recovery of human basophils after FMLP-stimulated secretion. Author: Dvorak AM, Warner JA, Fox P, Lichtenstein LM, Macglashan DW. Journal: Clin Exp Allergy; 1996 Mar; 26(3):281-94. PubMed ID: 8729665. Abstract: BACKGROUND: Basophils are circulating, secretory granulocytes that are generally considered to be end-stage cells. In one species of guinea-pigs, basophilic leucocytes have been shown to recover from stimulated secretion in short-term cultures. Similar studies have not been done using human basophils. OBJECTIVE: The purpose of this study was to examine human basophils in short-term recovery intervals following stimulation of secretion to determine whether visual evidence of recovery occurred. METHODS: We examined the ultrastructural morphology of early recovery (10 min-6 h) of human basophils following secretion stimulated by formyl-methionyl-leucyl-phenyl-alanine (FMLP). A combined technique for electron microscopy consisted of post-fixation exposure to cationized ferritin and reduced osmium, providing maximum quality images and allowing identification of intracellular spaces/organelles that opened to the cell surface, often out of the plane of section. RESULTS: The ultrastructural evaluation revealed that control basophils (0 time-6 h) did not undergo regulated secretion or develop the morphologies associated with recovery following secretion. FMLP-stimulated basophils underwent an overlapping continuum of piecemeal degranulation-->anaphylactic degranulation (0 time-1 min), producing vesicle- and granule-free, completely degranulated, viable, mature basophils with polylobed nuclei. The early recovery period (10 min-6 h) following FMLP stimulation was characterized by reconstitution of granules. Morphological mechanisms for granule reconstitution included a mixture of conservation, condensation, and synthetic events. CONCLUSION: Human basophils, like guinea pig basophils, have the potential to recover from regulated secretion.[Abstract] [Full Text] [Related] [New Search]