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Biomedical subjects

R Partridge

Publications and source records attributed to R Partridge.

At least 55 records · Page 3Linked to original sources
PubMed1985

Decreased calcium dependence of lymphoblastoid cell lines compared with Burkitt lymphoma cell lines.

The extracellular calcium level required for proliferation was compared in B lymphoid cell lines from various sources by determining the calcium concentration at which long-term proliferation was inhibited by 50% (CaPD50). Fourteen Burkitt lymphoma (BL) lines had a mean CaPD50 of 44 +/- 28 microM whereas 45 lymphoblastoid cell lines (LCLs) obtained by in vitro transformation of B lymphocytes with Epstein-Barr virus (EBV) had a mean CaPD50 of 3.6 +/- 1.8 microM. This difference applied also to autologous BL lines and LCLs established from the same patient. The decreased calcium requirement of virally-transformed compared with tumour-derived cell lines therefore appears to be a universal phenomenon in mammalian cells. Within the BL group, no correlation was found between the calcium requirement for proliferation and presence or absence of the EBV genome. Arrest of BL lines and LCLs occurred in the G1 phase of the cell cycle and was readily reversed by addition of calcium to the medium. One anomalous LCL was found which showed a high CaPD50 (43 +/- 6 microM) and accumulated in both G1 and G2. These results, in combination with a previous study of EBV transformation in vitro, indicate that the calcium dependence of B lymphocytes generally decreases in the following order: normal cells greater than BL cells = early stage transformation greater than LCL. The 2 transformed phenotypes thus distinguished in human lymphoid cells may offer unique opportunities for defining the status and expression of EBV in vitro and in vivo.

Burkitt Lymphoma↗
PubMed1981

A new prostaglandin E1 analogue (CL115,574). I. antisecretory and cytoprotective effects in the rat.

The effects of a new analogue of PGE1 (CL115,574) on gastric acid secretion, mucus secretion and protection against stress and indomethacin-induced ulcers were studied in the rat. CL115,574 was more potent than PGE1 and cimetidine in inhibiting acid secretion. CL115,574 protected against the development of stress and indomethacin-induced ulcers and prevented the indomethacin-induced decrease in hematocrit at an ED50 (3 micrograms/kg) far below the antisecretory ED50 (1 microgram/kg). While inhibiting acid secretion, CL115,574 increased the volume of gastric secretion indicating a stimulation of nonparietal cell secretion by the rat stomach. In addition the compound stimulated the secretion of mucus into the gastric juice. On the basis of its potency as an inhibitor of acid secretion and these additional effects which are indicative of cytoprotective activity, CL115,574 should be further studied as a possible anti-ulcer agent in man.

Alprostadil↗
PubMed1977

Prostaglandin E antagonist activity of 11, 15-bisdeoxy prostaglandin E1 and congeners.

d,l-11, 15-bisdeoxy PGE1 and certain of its congeners were shown to inhibit gerbil colon contractions induced by l-PGE1. While some of these compounds were selectively antagonistic of PGE1-induced contractions, others additionally inhibited the gerbil colon agonist activities of l-PGE2alpha and acetylcholine. The PGE1 inhibitory activity was apparently competitive in nature. With relatively weak potencies, the bisdeoxy PGE congeners displaced 3H-PGE1 from a fat cell binding site, suggesting competition for a common, putative receptor. Structure-activity relationships and potential utility of these analogs are discussed.

Animals↗
PubMed1976

Inhibition of prostaglandin-mediated ocular inflammatory responses by 4-biphenylacetic acid.

4-Biphenylacetic acid (BPAA),a prostaglandin-synthesis inhibitor, was tested for its effects on prostaglandin-related, laboratory models of ocular inflammation. Topically applied, BPAA inhibited arachidonic acid, but not prostaglandin E-induced increases in rabbit intraocular pressure (IOP). BPAA inhibited the IOP response to alkali burn and altered IOP changes following paracentesis. In vitro, BPAA inhibited prostaglandin production from arachidonic acid in cell-free preparations of rabbit uvea. It is suggested that BPAA may be useful for the therapy of ocular inflammatory disease.

Acetates↗