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R Domergue

Publications and source records attributed to R Domergue.

9 recordsLinked to original sources
PubMed2000

Selective accumulation of the endoplasmic reticulum-Golgi intermediate compartment induced by the antitumor drug KRN5500.

KRN5500 is a semisynthetic spicamycin analogue consisting of a seven-carbon amino sugar linked to a C(14) unsaturated fatty acid through glycine and to the amino group of adenine. The drug inhibits cell growth potently and has antitumor activity in in vivo models. The mechanism of the antiproliferative effect of KRN5500 remains to be elucidated. We have found that acute exposure of drug-sensitive HT-29 colon adenocarcinoma cells to the drug results initially in swelling of the Golgi apparatus. Continuous exposure to the drug resulted in the emergence of a resistant population of cells characterized by numerous intracellular vacuoles. These KRN5500-resistant tumor cells exhibited increased staining with the Golgi stain NBD C(6)-ceramide and the ER-Golgi fluorescent dye BODIPY-brefeldin A, which, unlike the parental drug-sensitive cells, was dispersed throughout the cytoplasm. Marker enzymes associated with the ER (glucose 6-phosphatase) and cis-Golgi (GalNAc transferase) were elevated >2-fold and nearly 4-fold, respectively, in drug-resistant cell lines while the trans-Golgi marker enzyme, galactosyltransferase, was not. The additional findings that the KRN5500-resistant cells have a >2-fold elevation in ERGIC-53, a cis-Golgi marker protein of the ER-Golgi intermediate compartment (ERGIC), as well as increased 58K, a 58-kDa microtubule-binding protein with formiminotransferase cyclodeaminase activity, and tubulin indicate that the cellular secretory pathway is a primary determinant of sensitivity to KRN5500, as resistance to this agent corresponds with accumulation of several components relatable to ER and cis-Golgi function. Further support for this conclusion is provided by studies which demonstrate that KRN5500 alters the distribution of newly synthesized carcinoembryonic antigen within the secretory pathway, including arrest of this N-glycosylated protein in the Golgi of LS-174T colon carcinoma cells.

Antibiotics, Antineoplastic↗
PubMed1979

[Replacement solutions and hemodilution].

By definition, haemodilution involves the use of filling solutions, but in this technique the role of different solutions has yet to be clearly defined. Amongst the criteria of choice used at the present time, two would seem to be essential: good tolerance, limiting the risks of complication and side effects to an absolute minimum; and a sufficiently long intravascular half-life ensuring good control of blood volume. On this basis, amongst the crystalloids Ringer lactate offers definite advantages. It is almost always used in association with a colloidal solution, very often human albumin or a dextran.

Anaphylaxis↗
PubMed1978

[Comparative study of venous contamination with low FiO2 and with pure oxygen in disease-induced pulmonary edema].

A comparative study of the venous contamination (Qs/Qt = (Cc'O2 - CaO2) / (Cc'O2 - C-vO2) under FIO2 = 0.45 - 0.6 and under FIO2 = 1, was realised in 9 patients with lesions of pulmonary oedema. Increasing the FIO2 lead to an increase in the venous contamination three times (average increase was 36 p. 100 of the initial value), to no change two times and a decrease four times (average decrease of 34 p. 100). The values of the venous contamination under average FIO2 are statistically lower in the group where it rises on increasing the FIO2 than in that in which it falls or remains unchanged (p is less than 0.005).

Humans↗
PubMedDate not supplied

In-field behaviour of banana plants (Musa AA sp) obtained after regeneration of cryopreserved embryogenic cell suspensions.

This study describes the in-field behavior of bananas (Musa AA sp.) obtained after regeneration of cryopreserved embryogenic cell suspensions. Observations were focused on the classical vegetal development descriptors. We observed no significant differences between the cryopreserved-derived plants and the control plants with respect to the plant height and circumference, the number of leaves, the number of fruits, the fruit length, the fruit diameter and weight, the bunch weight and the date of harvest. During the first culture cycle, 2 out of 11 descriptors analyzed were however found to be different between the control and the cryopreserved suspensions derived plants. These were the number of nodal clusters of the inflorescence (usually called hands) and the date of flowering. These differences were, however, quite minor as the two cases together amounted to only 2 % of the control value. During the second cycle of culture, no significant difference between the two groups of plants was found whatever the parameter analysed. These results suggest that, with the experimental conditions of the study, there is no difference at the agronomic level between plants produced from cryopreserved embryogenic cell suspensions and control plants.

Journal Article↗