Coexpression of Gas6/Axl in Human Ovarian Cancers

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Abstract

Objectives: Gas6, the protein product of the growth arrest-specific gene 6 (gas6), a member of the vitamin K-dependent protein family, was identified as a ligand for the Axl/Sky family of receptor tyrosine kinases. The aim is to study for the presence of Gas6 and its receptor Axl and Sky related to specific growth in the ovarian cancers, and to evaluate their plausible growth potential and mechanism. Methods: In ovarian cancers of 90 cases, the histoscores and mRNA levels of Gas6, Axl and Sky were determined by immunohistochemistry and competitive reverse transcription-polymerase chain reaction-Southern blot analysis using the recombinant RNA, respectively. Results: The histoscores and mRNA levels of Gas6 and Axl in ovarian cancers were significantly higher than in normal ovaries, regardless of histopathological type or clinical stage of ovarian cancers. Conclusions: Gas6/Axl pathway could play a role in the complex events taking place during the early changes of ovarian cancer progression.

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Most cited references 3

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Single-step method of RNA isolation by acid guanidinium thiocyanate-phenol-chloroform extraction.

P Chomczynski, N Sacchi (1987)

A new method of total RNA isolation by a single extraction with an acid guanidinium thiocyanate-phenol-chloroform mixture is described. The method provides a pure preparation of undegraded RNA in high yield and can be completed within 4 h. It is particularly useful for processing large numbers of samples and for isolation of RNA from minute quantities of cells or tissue samples.

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Functional impact of syntaxin on gating of N-type and Q-type calcium channels.

I. Bezprozvanny, R Scheller, R Tsien (1995)

Rapid and reliable synaptic transmission depends upon the close proximity of voltage-gated calcium channels and neurotransmitter-containing vesicles in the presynaptic terminal. Although it is clear that a local Ca2+ rise conveys the crucial signal from Ca2+ channels to the exocytotic mechanism, little is known about whether communication ever proceeds in the opposite direction, from the release machinery to Ca2+ channels. To look for such signalling, we examined the interaction of various types of voltage-gated Ca2+ channels with syntaxin, a presynaptic membrane protein of relative molecular mass 35,000 which may play a key part in synaptic vesicle docking and fusion and which interacts strongly with N-type Ca2+ channels. Here we report that co-expression of syntaxin 1A with N-type channels in Xenopus oocytes sharply decreases the availability of these channels. This is due to the stabilization of channel inactivation rather than to a simple block or lack of channel expression, because it is overcome by strong hyperpolarization. Deletion of syntaxin's carboxy-terminal transmembrane domain abolishes its functional effect on Ca2+ channels. Syntaxin produced a similar effect on Q-type Ca2+ channels encoded by alpha 1A but not on L-type Ca2+ channels. Thus, the syntaxin effect is specific for Ca2+ channel types that participate in fast transmitter release in the mammalian central nervous system. We hypothesize that, in addition to acting as a vesicle-docking site, syntaxin may influence presynaptic Ca2+ channels, opposing Ca2+ entry where it is not advantageous, but allowing it at release sites where synaptic vesicles have become docked and/or ready for fusion.

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Vascular Smooth Muscle Cell-derived, Gla-containing Growth-potentiating Factor for Ca-mobilizing Growth Factors

Hitoshi Arita, Norihisa Kikuchi, Toru Nakano … (1995)

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Author and article information

Journal

Journal ID (publisher-id): OCL

Journal ID (nlm-ta): Oncology

Journal ID (doi): 10.1159/issn.0030-2414

Title: Oncology

Publisher: S. Karger AG

ISSN (Print): 0030-2414

ISSN (Electronic): 1423-0232

Publication date Subscription-year: 2004

Publication date (Print): September 2004

Publication date (Electronic): 24 September 2004

Volume: 66

Issue: 6

Pages: 450-457

Affiliations

Departmentof Obstetrics and Gynecology, Gifu University School of Medicine, Gifu City, Japan

Article

Publisher ID: 79499 Other ID: Oncology 2004;66:450–457

DOI: 10.1159/000079499

PubMed ID: 15452374

SO-VID: 45009f67-1523-488f-98d5-2040dc1f0b36

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Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

History

Date received : 14 July 2003

Date accepted : 21 November 2003

Page count

Figures: 6, References: 43, Pages: 8

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Coexpression of Gas6/Axl in Human Ovarian Cancers

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Abstract

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Karger: Oncology

Most cited references 3

Single-step method of RNA isolation by acid guanidinium thiocyanate-phenol-chloroform extraction.

Functional impact of syntaxin on gating of N-type and Q-type calcium channels.

Vascular Smooth Muscle Cell-derived, Gla-containing Growth-potentiating Factor for Ca-mobilizing Growth Factors

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