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Biomedical subjects

P Russell

Publications and source records attributed to P Russell.

At least 361 records · Page 20Linked to original sources
PubMed1981

Early adenocarcinoma of the fallopian tubes. A case for multifocal tumorigenesis.

Seven cases of carcinoma in situ and/or early invasive carcinoma of the fallopian tube found in association with serous carcinoma of the ovary are described. These cases are considered to represent examples of multicentric tumorigenesis in Müllerian epithelia which have a common origin and have responded to a common carcinogenic influence. Early neoplastic lesions of the tube may be overlooked unless the tube is serially blocked. If this is done, such lesions may be expected in 5-10% of patients with serous carcinoma of the ovary. Criteria for diagnosis of carcinoma in situ are discussed, viz., a noninvasive proliferative epithelial lesion with disorganization of cellular relationships, significant mitotic activity and nuclear atypia (especially prominence of nucleoli). Criteria for diagnosis of invasive carcinoma of fallopian tube are also referred to particularly with respect to establishing a primary site of tumor origin in cases where masses are present in both ovaries and tubes.

Adenocarcinoma↗
PubMed1980

Differential control of protein kinase activities of the retinal photoreceptor. Cation effects on phosphorylation by adenosine and guanosine 5'-triphosphates.

ATP-kinase activity in photoreceptor membranes is maximal at equimolar amounts of ATP and Mg2+. GTP-kinase activity is maximal with high concentrations of Mn2+. Under these conditions, calcium ion markedly inhibits phosphorylation with ATP but not with GTP. GTP-kinase activity is maximal at pH 6.5 and decreases at higher pH; little change is seen in ATP-kinase activity over the pH range of 6.0-7.5. GTP-kinase activity is inhibited by ATP and other adenine compounds; ATP-kinase activity is less sensitive, although I mM adenosine decreases activity by about threefold. No marked differences in the protein moieties phosphorylated by ATP or GTP were seen in bovine or frog outer segment membranes. Fluxes in cation and metabolite concentrations as well as availability of ATP and GTP could thus exert a major influence on protein kinase activity in the photoreceptor unit, affording the possibility of differential phosphorylation under various physiological conditions.

Adenosine↗
PubMed1980

Recurrent reproductive failure due to severe placental villitis of unknown etiology.

A case is reported of recurrent reproductive failure due to a severe placental villitis of unknow etiology. Five successive pregnancies ended in four unexpected third-trimester deaths in utero and one live birth at 37 weeks' gestation. This infant of the fourth pregnancy showed severe intrauterine growth retardation but no other stigmata of chronic infection. The placentas of the last three pregnancies showed marked focal chronic parenchymal inflammation with widespread necrosis, villous vasculitis and a lymphocytic deciduitis of the maternal floor. Microbiologic, serologic and electron microscopic techniques variously employed on maternal, fetal and placental specimens failed to demonstrate a possible causative agent although the placental inflammatory pattern was strongly suggestive of recurrent infection.

Adult↗
PubMed1980

Membrane alterations during cataract development in the Nakano mouse lens.

The anterior cortical fiber cells of the 12-day-old Nakano mouse lens revealed an extremely large number of gap junctions, the appearance of which was identical to those of the normal lens. Although the number of gap junctions of the cells in the same area at 29 days was comparable to that seen at 12 days, the size of each junction became smaller with cataract formation. The junctions were almost absent in the anterior cortical cells in 7-month-old Nakano mice. Biochemical analysis revealed that the 26,000 MW polypeptide closely associated with the cell membrane was lower in amount in the membrane preparation of the 29-day Nakano mouse lens than in the 12-day lenses. With the membrane fractions of lenses from 90-day Nakano mice, the absence of a major 26,000 NW polypeptide component correlates with the decrease in gap junction structures. The alternations in the gap junctions and membrane associated polypeptides of the Nakano lens may be linked with the steps leading to cataract development.

Aging↗
PubMed1979

Pulmonary infection with Petriellidium boydii.

A 52-year-old woman with pulmonary involvement with Petriellidium boydii in a bronchiectatic lung segment is described. Pulmonary involvement with this organism has been most frequently described in patients with underlying systemic diseases or compromised immune systems. This patient apparently had neither problem and was normal in all other aspects. Surgical resection was done to avoid local pulmonary parenchymal invasion or dissemination of this fungus. The patient is now in good health two years after operation.

Ascomycota↗
PubMed1979

Characteristics of a retrovirus associated with a hamster melanoma.

The continuous culture of a hamster melanoma cell line has led to the spontaneous appearance of a retrovirus (HaRV) with typical type-C characteristics. The virus differs from all other known hamster viruses in its ability to transform murine as well as rat and hamster cells with apparent one-hit kinetics. Guinea pig, human and feline cells were not transformed although reverse transcriptase activity was detected in the supernatant from infected human cells. HaRV-transformed hamster embryo cells produced solid tumours (all non-pigmented) in 4 out of 35 animals when injected into hamsters while HaRV-transformed murine cells produced no tumours in mice. Injection of HaRV alone in hamsters, mice and rabbits did not induce tumours. HaRV possesses a 70S RNA which dissociates to 35S in DMSO and has a reverse transcriptase which utilizes the 70S virus RNA as a template. The size, morphology and density (1.15 g/ml) are similar to other known type-C viruses. Polyacrylamide gel electrophoresis indicates the presence of polypeptides analogous to those found in other type-C viruses.

Animals↗
PubMed1979

Biochemical and immunological properties of the reverse transcriptase associated with a hamster retrovirus.

Several properties of an RNA-directed DNA polymerase associated with a hamster retrovirus (HaRV) were examined and found to be similar to other polymerases from mammalian type-C viruses in that the enzyme (i) is more active with Mn2+ than Mg2+, (ii) uses the reverse transcriptase-specific poly(rCm).oligo(dG) template, (iii) possesses substantial endogenous polymerase activity and (iv) is strongly inhibited by homologous antisera and moderately inhibited by antisera directed against other type-C viruses. In contrast to previous reports of polymerases from other hamster viruses, HaRV polymerase is active in endogenous assays and the activity is associated with a 70,000 mol. wt. polypeptide in highly purified virions and with 70,000 and 85,000 mol. wt. polypeptides in fresh, unpurified virus. Only one major peak of polymerase activity eluted from DEAE-cellulose while subsequent elution of this peak from phosphocellulose produced two major peaks of polymerase activity. The mol. wt. of these two peaks were 70,000 and 85,000 by glycerol density-gradient sedimentation. The HaRV reverse transcriptase and p30 were found to be most closely related antigenically to other rodent retrovirus proteins.

Animals↗
PubMed1979

Sclerosing stromal tumours of the ovary.

Sclerosing stromal tumours of the ovary have recently been described as a histologically and clinically distinct subgroup within the thecoma-fibroma spectrum of benign ovarian sex cord stromal tumours. Reported cases occurred predominantly in young women and only occasional tumours showed evidence of hormonal activity. The present series of five cases expands the spectra of both histological patterns and clinical presentations and suggests that the entity of sclerosing stromal tumours may not be as clearly circumscribed as has been previously reported.

Adolescent↗
PubMed1979

Proliferating ovarian "epithelial" tumours: a clinico-pathological analysis of 144 cases.

In a 25-year period, 144 patients with proliferating epithelial ovarian tumours were treated at the King George V Memorial Hospital. These tumours were classified according to the World Health Organisation (WHO) Histological Classification of Ovarian Tumours and subsequently divided into 4 grades of proliferation, again on histological criteria. The tumours were staged at laparotomy in accord with the recommendations of the International Federation of Gynecology and Obstetrics (FIGO). Follow-up data, analysed by a life-table method, were correlated against histological type of tumour, histological grade of proliferation, clinical/laparotomy stage, and mode of surgical therapy. Stage 1 proliferating tumours may be treated by surgery alone, including unilateral salpingo-oophorectomy in selected cases. Stage 2 and Stage 3 tumours should be treated similarly to invasive ovarian carcinomas of the same stage, despite their overall favourable prognosis.

Castration↗
PubMed1979

A new gene involved in expression of fructose-1,6-diphosphate aldolase activity in Escherichia coli.

A new gene, fdaB, has been mapped by transduction and partial diploid analyses and located adjacent to argA at 59.9 min on the Escherichia coli recalibrated linkage map. This gene is involved in expression of fructose-1,6-diphosphate aldolase activity and indirectly in ribosomal RNA synthesis. The temperature-sensitive mutant strain AA-157, containing the defective gene product of of fdaB, accumulates high concentrations of fructose 1,6-diphosphate at the nonpermissive temperature.

Chromosome Mapping↗