CALEB binds via its acidic stretch to the fibrinogen-like domain of tenascin-C or tenascin-R and its expression is dynamically regulated after optic nerve lesion

Item Type:	Article
Title:	CALEB binds via its acidic stretch to the fibrinogen-like domain of tenascin-C or tenascin-R and its expression is dynamically regulated after optic nerve lesion
Creators Name:	Schumacher, S. and Jung, M. and Noerenberg, U. and Dorner, A. and Chiquet-Ehrismann, R. and Stuermer, C.A.O. and Rathjen, F.G.
Abstract:	Recently, we described a novel chick neural transmembrane glycoprotein, which interacts with the extracellular matrix proteins tenascin-C and tenascin-R. This protein, termed CALEB, contains an epidermal growth factor-like domain and appears to be a novel member of the epidermal growth factor family of growth and differentiation factors. Here we analyze the interaction between CALEB and tenascin-C as well as tenascin-R in more detail, and we demonstrate that the central acidic peptide segment of CALEB is necessary to mediate this binding. The fibrinogen-like globe within tenascin-C or -R enables both proteins to bind to CALEB. We show that two isoforms of CALEB in chick and rodents exist that differed in their cytoplasmic segments. To begin to understand the in vivo function of CALEB and since in vitro antibody perturbation experiments indicated that CALEB might be important for neurite formation, we analyzed the expression pattern of the rat homolog of CALEB during development of retinal ganglion cells, after optic nerve lesion and during graft-assisted retinal ganglion cell axon regeneration by in situ hybridization. These investigations demonstrate that CALEB mRNA is dynamically regulated after optic nerve lesion and that this mRNA is expressed in most developing and in one-third of the few regenerating (GAP-43 expressing) retinal ganglion cells.
Keywords:	Amino Acid Sequence, Amino Acid Sequence Homology, Avian Proteins, Axons, Brain, Chick Embryo, Complementary RNA, COS Cells, Cytoplasm, Complementary DNA, Epidermal Growth Factor, Fibrinogen, Ganglia, In Situ Hybridization, Membrane Glycoproteins, Messenger RNA, Molecular Sequence Data, Nerve Tissue Proteins, Optic Nerve, Protein Binding, Protein Isoforms, Recombinant Proteins, Retina, Tenascin, Tertiary Protein Structure, Time Factors, Transfection, Animals, Mice, Rats
Source:	Journal of Biological Chemistry
ISSN:	0021-9258
Publisher:	American Society for Biochemistry and Molecular Biology
Volume:	276
Number:	10
Page Range:	7337-7345
Date:	1 January 2001
PubMed:	View item in PubMed

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