title: Quantitative microscopy of mole rat eosinophil granule morphology.
abstract: Mole rat bone marrow cells and peritoneal eosinophils are used to study granule morphological maturation by quantitative microscopy. The bulk eosinophil granule content is pre-stored in unique granular structures known as crystalloid or secondary granules. Mole rat eosinophil granules exhibit the basic structure of an electron-dense crystalloid core surrounded by a lighter, homogeneous matrix. Morphometric analysis demonstrated that bone marrow-derived eosinophil sphere-like granules display a periodic, multimodal granule volume distribution. In contrast, peritoneal eosinophils display cigar-shaped granules, whose crystalloid cores are more variable in size and shape as compared to bone marrow eosinophil granules. Using a morphometric approach, we deduced that the basic granule volume quantum is similar in both cases, suggesting that the sphere-like young eosinophil granules turn into dense ellipsoidal ones by intragranular processes in which both volume and membrane surface are conserved. Crystalloid granule mediators are known to be widely associated with allergic inflammatory events, which may damage the host tissue following secretion to the extracellular environment. Based on mathematical modeling, we suggest that this deviation from sphere-like to ellipsoidal shape reflects an adaptive response of the mole rat to its unique solitary life.
authors.affiliation: Sackler Faculty of Medicine, Department of Pathology, Tel Aviv University, Tel Aviv, 6997801, Israel.
authors.forename: Dina
authors.initials: D
authors.lastname: Amihai
authors.affiliation: Raymond and Beverly Sackler Faculty of Exact Sciences, School of Mathematical Sciences, Department of Statistics and Operations Research, Tel Aviv University, Tel Aviv, 6997801, Israel. isaco@math.tau.ac.il.
authors.forename: Isaac
authors.initials: I
authors.lastname: Meilijson
authors.affiliation: Department of Zoology, Faculty of Life Sciences, Tel-Aviv University, Tel Aviv, 6997801, Israel.
authors.forename: Joseph
authors.initials: J
authors.lastname: Terkel
authors.affiliation: Sackler Faculty of Medicine, Department of Pathology, Tel Aviv University, Tel Aviv, 6997801, Israel. ilanh@patholog.tau.ac.il.
authors.forename: Ilan
authors.initials: I
authors.lastname: Hammel
mesh_terms: D000818:Animals; D003594:Cytoplasmic Granules / Q000502:physiology*; D004804:Eosinophils / Q000502:physiology*; D008853:Microscopy / Q000379:methods*; D019577:Mole Rats; D051381:Rats
keywords: Eosinophil; Quantitative microscopy; Unit granule