Evidence for a high-molecular-weight form of pig intestinal calcium-binding protein

1980 ◽  
Vol 8 (5) ◽  
pp. 528-529
Author(s):  
HOMA MELLERSH ◽  
STEPHEN TOMLINSON
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Calcium Binding ◽  
Binding Protein ◽  
Calcium Binding Protein ◽  
High Molecular Weight Form ◽  
Molecular Weight Form

Spreading of microinjected horseradish peroxidase to nondescendant cells in embryos of Patella (Mollusca, Gastropoda)

Development ◽  
1987 ◽  
Vol 100 (4) ◽  
pp. 713-722
Author(s):  
W.M. Kuhtreiber ◽  
F. Serras ◽  
J.A.M. van den Biggelaar
Keyword(s):  
Molecular Weight ◽  
Stem Cell ◽  
Horseradish Peroxidase ◽  
High Molecular Weight ◽  
Fluorescein Isothiocyanate ◽  
Contact Phase ◽  
High Molecular Weight Form ◽  
Contact Stage ◽  
Fluorescein Isothiocyanate Dextran ◽  
Molecular Weight Form

We have injected horseradish peroxidase (HRP) and fluorescein-isothiocyanate dextran (FD) into cells and into the blastocoelic cavity of Patella vulgata embryos, before and during the interval between 5th and 6th cleavage, in which the mesodermal stem cell is determined by means of interactions between the central 3D macromere and the contacting animal micromeres. Intracellular injections of HRP at different stages showed that, whereas before this contact phase no spreading of label was observed, a clear intercellular transfer of HRP was found after the contact was established. Control experiments showed that it was HRP in its intact, high molecular weight form that was transferred in the living embryo. Injections of HRP into the blastocoelic cavity gave essentially the same results. In these cases, the HRP was taken up by the cells from contact stage onwards. When FD was injected into the blastocoelic cavity, no uptake was observed, not even after prolonged presence of FD in it. However, when HRP and FD were mixed, both were taken up, starting at contact stage. Differences in labelling pattern of HRP, as compared with FD, and a shift of the FD fluorescence after uptake, suggest that receptor-mediated endocytosis is involved. The possible morphogenetic significance of the transfer mechanism is discussed.

Immunomicroscopic localization of the 10 000 molecular weight calcium-binding protein in the human enterocyte

Apmis ◽  
1989 ◽  
Vol 97 (7-12) ◽  
pp. 901-907 ◽  
Author(s):  
MICHAEL STAUN ◽  
STEFFEN FRIIS ◽  
ERIK DABELSTEEN ◽  
GERT H. HANSEN
Keyword(s):  
Molecular Weight ◽  
Calcium Binding ◽  
Binding Protein ◽  
Calcium Binding Protein ◽  
Human Enterocyte
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