Recent Advances in Cytochemistry and Ultrastructure of Cytoplasmic Inclusions in Ciliophora (Protozoa)

Gp, Dutta

doi:10.1016/s0074-7696(08)60941-9

Cited by 4 publications

(1 citation statement)

References 190 publications

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“…Over a long time period, vacuoles containing calcium and phosphorus are known from different ciliates (Coleps, Euplotes, Paramecium, Tetrahymena), as found by widely different analysis methods (Rosenberg, 1966;Faure-Fermiet et aI., 1968;Coleman et al, 1974;Dutta, 1974;Hausmann and Walz, 1979). We confirmed Ca content in vacuoles of Paramecium by EDX (Hardt and Plattner, 1999).…”

Section: Endoplasmic Reticulum Golgi Apparatus Andsupporting

confidence: 74%

Calcium in ciliated protozoa: Sources, regulation, and calcium-regulated cell functions

Plattner

Klauke²

2001

International Review of Cytology

105

121

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In ciliates, a variety of processes are regulated by Ca 2 ', e.g., exocytosis, endocytosis, ciliary beat, cell contraction, and nuclear migration. Differential microdomain regulation may occur by activation of specific channels in different cell regions (e.g., voltagedependent Ca 2 ' channels in cilia), by local, nonpropagated activation of subplasmalemmal Ca stores (alveolar sacs), by different sensitivity thresholds, and eventually by interplay with additional second messengers (cilia). During stimulus-secretion coupling, Ca 2 ' as the only known second messenger operates at -5 f.tM, whereby mobilization from alveolar sacs is superimposed by "store-operated Ca

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Section: Endoplasmic Reticulum Golgi Apparatus Andsupporting

confidence: 74%

Calcium in ciliated protozoa: Sources, regulation, and calcium-regulated cell functions

Plattner

Klauke²

2001

International Review of Cytology

105

121

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Cellular dynamics of conjugation in the ciliate euplotes aediculatus. II. Cellular membranes

Geyer

Kloetzel

1987

Journal of Morphology

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The formation and subsequent dissolution of a common bridge of cytoplasm between conjugating ciliated protozoan cells provides an excellent opportunity to follow the dynamics of the cellular membrane systems involved in this process. In particular, separation of conjugant partners offers the chance to observe, at a fixed site on the cell surface, how the ciliate surface complex of plasma and alveolar membranes (collectively termed the "pellicle") is constructed. Consequently, cortical and cellular membranes of Euplotes aediculatus were studied by light and electron microscopy through the conjugation sequence. A conjugant fusion zone of shared cytoplasm elaborates between the partner cells within their respective oral fields (peristomes) to include microtubules, cytosol, and a concentrated endoplasmic reticulum (heavily stained by osmium impregnation techniques) that may also be continuous with cortical ER of each cell. Cortical membranes displacd by fusion are autolyzed in acid phosphatase-positive lysosomes in the fusion zone. As conjugants separate, expansion of the plasma membrane may occur through the fusion of vesicles with the plasma membrane, presumably at bare membrane, presumably at bare membrane patches near the fusion zone. The underlying cortical alveolar membranes and their plate-like contents are reconstructed beneath the plasma membrane, apparently by multiple fusions of dense-cored alveolar precursor vesicles (APVs). These precursor vesicles themselves appear to condense directly from the smooth ER present in the fusion zone. No Golgi apparatus was visible in the fusion zone cytoplasm, and no step of APV maturation that might involve the Golgi complex was noted.

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References Cited: a Selected Bibliography, with Emphasis on Works Published since 1960

Corliss

1979

The Ciliated Protozoa

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Recent Advances in Cytochemistry and Ultrastructure of Cytoplasmic Inclusions in Ciliophora (Protozoa)

Cited by 4 publications

References 190 publications

Calcium in ciliated protozoa: Sources, regulation, and calcium-regulated cell functions

Calcium in ciliated protozoa: Sources, regulation, and calcium-regulated cell functions

Cellular dynamics of conjugation in the ciliate euplotes aediculatus. II. Cellular membranes

References Cited: a Selected Bibliography, with Emphasis on Works Published since 1960

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