title: New ultrastructural observations: parallel tubular arrays in human T gamma lymphoid cells.
abstract: T gamma cells are E-rosetting cells bearing Fc receptors for IgG (E+, Fc gamma + cells). Third population (non-T, non-B) lymphoid cells are also Fc gamma + cells and contain unique inclusions called parallel tubular arrays (PTA). Although T gamma cells and third population lymphoid cells should belong to a similar population of cells, previous ultrastructural studies on purified T gamma cells have failed to reveal the presence of PTA. In this study, we have unequivocally demonstrated PTA in the majority of T gamma cells using simple rosetting techniques. A total of 76 EA hu-rosettes and 108 EA ox-rosettes prepared from an E+ enriched fraction (using sheep erythrocytes as marker particles) were directly examined by electron microscopy. PTA were found in 87% of the EA hu-rosettes and 82% of the EA ox-rosettes. Ammonium chloride, commonly used in other laboratories to lyse erythrocytes during the purification procedure was found to cause a marked decrease in the number of ultrastructurally distinct PTA profiles. In contrast, hypotonic lysis had no effect on cellular ultrastructure. This study showed for the first time that T gamma cells are ultrastructurally similar to other Fc gamma + lymphoid cells and contain PTA as a distinct marker. The significance of our findings to the basic function of this E+ Fc gamma + lymphoid population is discussed.
mesh_terms: D000643:Ammonium Chloride; D004912:Erythrocytes / Q000378:metabolism; D006801:Humans; D007038:Hypotonic Solutions; D008870:Microtubules / Q000648:ultrastructure*; D011947:Receptors, Antigen, B-Cell / Q000378:metabolism; D011961:Receptors, Fc / Q000276:immunology; D017452:Receptors, IgG; D012397:Rosette Formation / Q000379:methods*; D012965:Sodium Chloride; D013601:T-Lymphocytes / Q000145:classification / Q000276:immunology / Q000648:ultrastructure*
chemical_list: D007038:Hypotonic Solutions; D011947:Receptors, Antigen, B-Cell; D011961:Receptors, Fc; D017452:Receptors, IgG; D000643:Ammonium Chloride; D012965:Sodium Chloride