ULTRASTRUCTURE OF ANAPLASMAL INCLUSIONS (PAWHUSKA ISOLATE) AND THEIR APPENDAGES IN INTACT AND HEMOLYZED ERYTHROCYTES AND IN COMPLEMENT-FIXATION ANTIGEN

  • 1 January 1978
    • journal article
    • research article
    • Vol. 39  (7) , 1123-1130
Abstract
Hemolysis of parasitized [cow] erythrocytes augmented visualization of the anaplasmal inclusion, including its initial bodies, inclusion membrane and inclusion appendage (''tail'' or ''band''). A dense attachment complex joined the appendage to the inclusion membrane (wall of the inclusion vacuole). The inclusion appendage consisted of tightly packed, interconnected laminae and assumed loop, dumbbell and comet configurations. The erythrocytic plasmalemma and the inclusion membrane had a thickness of 9.0 .+-. 0.8 nm and similar structures. The initial bodies were covered by a thin inner organismic membrane (7.0 .+-. 0.7 nm thick) attached to the organismic chromatin, an intermembranous matrix and by an outer membranous sheath or pellicle (12.5 .+-. 1.2 nm thick). Dense granular aggregates 24-40 nm in diameter) within chromatin clumps were the only structures in the initial body remotely similar to ribosomes, yet they were too large, were never free of chromatin, and appeared to disappear upon hemolysis. Complement-fixation antigen prepared by fractionation contained initial bodies, inclusion appendages, a few mitochondria, vesicularized membranes and stromal debris. The preparatory treatment caused segregation of the organismic chromatin into independent dense particles 103 .+-. 12 nm in diameter still bound by inner organismic membrane. Similar particles were seen in the plasma and inclusion vacuoles of hemolyzed erythrocytes.