Communicating junctions between pillar cells in the gills of the atlantic hagfish,Myxine glutinosa

1985 ◽  
Vol 41 (8) ◽  
pp. 1039-1040 ◽  
Author(s):  
H. Bartels ◽  
B. Decker
Keyword(s):  
Myxine Glutinosa ◽  
Pillar Cells ◽  
Communicating Junctions

Calmodulin-mediated gating of lens gap junction channels in vesicles

1984 ◽  
Vol 42 ◽  
pp. 134-137
Author(s):  
Camillo Peracchia ◽  
Stephen J. Girsch
Keyword(s):  
Gap Junctions ◽  
Freeze Fracture ◽  
Orthogonal Arrays ◽  
Eye Lens ◽  
Lens Fiber ◽  
Cell Coupling ◽  
Particle Spacing ◽  
Fiber Cells ◽  
Gap Junction Channels ◽  
Communicating Junctions

The fiber cells of eye lens communicate directly with each other by exchanging ions, dyes and metabolites. In most tissues this type of communication (cell coupling) is mediated by gap junctions. In the lens, the fiber cells are extensively interconnected by junctions. However, lens junctions, although morphologically similar to gap junctions, differ from them in a number of structural, biochemical and immunological features. Like gap junctions, lens junctions are regions of close cell-to-cell apposition. Unlike gap junctions, however, the extracellular gap is apparently absent in lens junctions, such that their thickness is approximately 2 nm smaller than that of typical gap junctions (Fig. 1,c). In freeze-fracture replicas, the particles of control lens junctions are more loosely packed than those of typical gap junctions (Fig. 1,a) and crystallize, when exposed to uncoupling agents such as Ca++, or H+, into pseudo-hexagonal, rhombic (Fig. 1,b) and orthogonal arrays with a particle-to-particle spacing of 6.5 nm. Because of these differences, questions have been raised about the interpretation of the lens junctions as communicating junctions, in spite of the fact that they are the only junctions interlinking lens fiber cells.

Cartilage in the atlantic hagfish,Myxine glutinosa

1984 ◽  
Vol 169 (4) ◽  
pp. 407-424 ◽  
Author(s):  
Glenda M. Wright ◽  
Fred W. Keeley ◽  
John H. Youson ◽  
Donna L. Babineau
Keyword(s):  
Myxine Glutinosa

Differential Effects of Cadmium and Mercury on Lysosomal Enzymes in the Kidney of Myxine Glutinosa

1989 ◽  
pp. 71-74
Author(s):  
E. Elger ◽  
R. Sievers ◽  
B. Elger ◽  
C. J. Olbricht ◽  
H. Stolte
Keyword(s):  
Lysosomal Enzymes ◽  
Differential Effects ◽  
Myxine Glutinosa

The mechanism of T cell mediated cytotoxicity IV. Studies on communicating junctions between cells in contact

1977 ◽  
Vol 196 (1122) ◽  
pp. 73-84 ◽  
Keyword(s):  
T Cell ◽  
Mammalian Cells ◽  
Cytotoxic T Cells ◽  
Diploid Cell ◽  
Target Cells ◽  
Cytotoxic Lymphocytes ◽  
Communicating Junctions ◽  
Unique System ◽  
Pass Through ◽  
Autoradiographic Technique

A modified autoradiographic technique has been developed which makes it possible to demonstrate the intercellular transfer of diffusible molecules through communicating junctions. This technique has been used to decide whether or not there is a cytoplasmic union between cytotoxic lymphocytes and the target cells they destroy. The transfer of 51 Cr, [ 3 H]uridine and [ 3 H]choline has been demonstrated between human diploid cell line cells (MRC 5) in contact. This has provided a system in which the techniques could be assessed. The demonstration that 51 Cr can pass through communicating junctions provides a unique system for the investigations of these structures. Despite the fact that all three labels could transfer between MRC 5 cells in contact, no transfer between cytotoxic T cells and P815 target cells could be demonstrated during a cytotoxic reaction. The reported transfer of fluorescein can probably be attributed to the transfer of fluorescein ester via the extracellular space. It is concluded, therefore, that communicating junctions of the type that can form between certain mammalian cells in contact do not contribute to the mechanism of T cell cytotoxicity.

scholarly journals Natriuretic peptide receptors in the kidney and the ventral and dorsal aortae of the Atlantic hagfish Myxine glutinosa (Agnatha).

1995 ◽  
Vol 198 (9) ◽  
pp. 1875-1882 ◽  
Author(s):  
T Toop ◽  
J A Donald ◽  
D H Evans
Keyword(s):  
Natriuretic Peptide ◽  
Binding Sites ◽  
Kidney Tissue ◽  
Peptide Receptors ◽  
Natriuretic Peptide Receptors ◽  
Myxine Glutinosa ◽  
Clearance Receptor ◽  
Relationship Of ◽  
The Relationship ◽  
Gmp Production

The character of natriuretic peptide receptors (NPRs) in the kidney and aortae of the Atlantic hagfish Myxine glutinosa was determined and compared with that of NPRs in hagfish gills. The relationship of hagfish kidney and aortic NPRs with NPRs from higher vertebrates was also examined. Iodinated atrial and C-type natriuretic peptides (NPs) (125I-ANP, 125I-CNP) were used in tissue section autoradiography, competition studies and guanylate cyclase (GC) assays. Rat atrial and porcine C-type NPs (rANP, pCNP) and rat des[Gln18, Ser19, Gly20, Leu21 Gly22]ANP-(4-23)-NH2 (C-ANF, which binds to the mammalian and teleost 'clearance' receptor, NPR-C), were used as competing ligands. 125I-ANP binding sites were observed on both aortae and on the glomeruli, neck segments and archinephric ducts of the kidney. 4.0 nmol l-1 rANP competed for 50% of 125I-ANP glomerular sites. 125I-CNP did not visibly bind to any of the tissues, but 300 nmol l-1 pCNP competed for 50% of 125I-ANP glomerular sites. C-ANF failed to compete for 125I-ANP sites. rANP and pCNP stimulated cyclic GMP production in kidney membrane preparations, but C-ANF did not, demonstrating that the hagfish kidney NPR is GC-linked. This study suggests that a predominant population of ANP-like receptors, similar to the mammalian NPR-A, exists in the myxinoid aortae and kidney tissue. However, no detectable population of a receptor that binds all NPs, such as is present in the hagfish gill, nor an NPR similar to the NPR-C of higher vertebrates was discovered.

scholarly journals Some Spectrophotometric Characteristics of Hemoglobin in the Atlantic Hagfish (Myxine glutinosa L.).

1967 ◽  
Vol 21 ◽  
pp. 2849-2854 ◽  
Author(s):  
Rudolf Quast ◽  
Sven Paléus ◽  
Eric Östlund ◽  
Gunnar Bloom ◽  
G. Hagen
Keyword(s):  
Myxine Glutinosa
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