Galectin-3 mRNA level depends on transformation phenotype in ras-transformed NIH 3T3 cells

Summary— The increase in galectin-3 lectin content observed in tumours or in in vitro transformed cells suggests that this lectin is important in the transformation process. In the present study, we investigated the mRNA expression level of the galectin-3, galectin-I and macrophage mannose receptor in normal and ras-transformed NIH 3T3 cells in relation to their transformation state. The galectin3 mRNA content in ras-transformed cells is increased in fully transformed cells, with a maximum in ras-transformed cells that have lost their growth anchorage-dependence. Under the same conditions, the galectin-1 mRNA level which was high in normal cells, increased slightly in transformed cells. The mRNA for the macrophage mannose receptor was not detected in 3T3 cells or in their ras-transformed counterparts.     

Theoretical Basis of Protocols for Seed Storage III. Optimum Moisture Contents for Pea Seeds Stored at Different Temperatures

In previous work, we demonstrated that there was an optimummoisture level for seed storage at a given temperature (Vertucciand Roos, 1990), and suggested, using thermodynamic considerations,that the optimum moisture content increased as the storage temperaturedecreased (Vertucci and Roos, 1993b). In this paper, we presentdata from a two year study of aging rates in pea (Pisum sativum)seeds supporting the hypothesis that the optimum moisture contentfor storage varies with temperature. Seed viability and vigourwere monitored during storage under dark or lighted conditionsat relative humidities between 1 and 90%, and temperatures between-5 and 65°C. The optimum moisture content varied from 0·015g H₂O g^-1 d.wt at 65°C to 0·101 g H₂O g^-1 d.wt at15°C under dark conditions and from 0·057 at 35°Cto 0·092 g H₂O g^-1 d.wt at -5°C under lighted conditions.Our results suggest that optimum moisture contents cannot beconsidered independently of temperature. This conclusion hasimportant implications for 'ultra-dry' and cryopreservationtechnologies.Copyright 1994, 1999 Academic Press Seed storage, seed aging, seed longevity, water content, temperature, glass, desiccation damage, ultradry, Pisum sativum L., pea, cryopreservation     

Regulation, replication, and integration functions of the Vibrio cholerae CTXφ are encoded by region RS2

CTXφ is a filamentous phage that encodes cholera toxin, one of the principal virulence factors of Vibrio cholerae . CTXφ is unusual among filamentous phages because it can either replicate as a plasmid or integrate into the V. cholerae chromosome at a specific site. The CTXφ genome has two regions, the 'core' and RS2. Integrated CTXφ is frequently flanked by an element known as RS1 which is related to RS2. The nucleotide sequences of RS2 and RS1 were determined. These related elements contain three nearly identical open reading frames (ORFs), which in RS2 were designated rstR , rstA2 and rstB2 . RS1 contains an additional ORF designated rstC . Functional analyses indicate that rstA2 is required for CTXφ replication and rstB2 is required for CTXφ integration. The amino terminus of RstR is similar to the amino termini of other phage-encoded repressors, and RstR represses the expression of rstA2 . Although genes with related functions are clustered in the genome of CTXφ in a way similar to those for other filamentous phages, the CTXφ RS2-encoded gene products mediating replication, integration and repression appear to be novel.     

Long-Term Drug Treatment of Obesity in a Private Practice Setting

ATKINSON, RICHARD L, ROY C BLANK, DONALD SCHUMACHER, NIKHIL V DHURANDHAR, DOUGLAS L RITCH. Long-term drug treatment of obesity in a private practice setting. This study evaluated the long-term efficacy and safety of the combination of phentermine and fenfluramine for the treatment of obesity in a private practice setting. A total of 1388 consecutive, qualified patients presenting to a private general internal medicine practice in Charlotte, NC, were enrolled with eligibility criteria including: age 18 years to 60 years, 20% over “desirable” bodyweight or body mass index <27, no serious medical or psychiatric disease, and no contraindications to drug therapy. Patients were instructed in diet, exercise, and behavior modification techniques and received phentermine (15 mg/day to 30 mg/day) and fenfluramine (20 mg/day to 60 mg/day) continuously for over 3 years. Average duration of treatment was 15. 9 months, and average weight loss at the last visit was 11. 6 kg, or 11. 7% of initial bodyweight. For patients completing 1 year of drug treatment, mean weight loss was 16. 5 kg, or 16% of initial weight. Weight loss persisted for 2 years, but partial regain was seen at 3 years. The dropout rates were 18% at 6 months, 39% at 1 year, 68% at 2 years, and 78% at 3 years. At 1 year, blood pressure of hypertensive patients fell from 151/95 mm Hg to 127/78 mm Hg, and serum cholesterol and triglycerides of hyperlipidemic patients fell by 0. 750 mmol/L (29 mg/dL) and 0. 937 mmol/L (83 mg/dL), respectively. Adverse events were modest. We conclude that, in a private practice setting, long-term treatment of obesity with the combination of phentermine, fenfluramine, and a weight maintenance program is generally safe and effective. More research is needed to determine efficacy and safety for longer than 3 years.     

Surgical Treatment of Constipation

A 30-year retrospective review of 544,354 Seattle area hospital admissions yielded 25 patients who underwent surgical therapy for the relief of intractable idiopathic constipation. All patients were refractory to conventional medical treatment consisting of the daily use of laxatives, cathartics, emollients or enemas. Long-term follow-up was available for 13 of the 25 patients. All 13 patients had clinical improvement as a result of the operation. This confirms results reported by other authors. Subtotal colectomy and left hemicolectomy are the procedures generally favored.     

Selected aspects of collared peccary (Dicotyles tajacu) reproductive biology in a captive texas herd

Collared peccaries (Dicotyles tajacu) from 32 litters were born in captivity during the period from September, 1981 through July, 1983. Incidence of singleton, twin, and triplet litters was 28%, 66%, and 6%, respectively. Mean (± SE) weight of young from singleton, twin, and triplet litters was 751 (± 35) gm, 698 (± 17) gm, and 612 (± 74) gm, respectively. Sex ratio among all litters was 56:44 (M:F). Neonatal mortality amounted to 9% of the young born. Mean duration of estrus was 2.60 days and mean length of gestation was 145.6 days. Evidence indicated that multiple copulations increased ovulation rate and the chance for conception.     

Cytochemical and electrophoretic studies of haemoglobin synthesis in the fat body of a midge, Chironomus thummi

The fat body of developing mid- and late fourth instar larvae of a midge, Chironomus thummi, has been investigated by means of the benzidine reaction for the localization of haemoglobin within cells. In the subepidermal fat body the reaction deposits of the haemoglobin pseudo-peroxidase activity appear predominantly in the intracisternal cavities of ER and the Golgi, and later, in the pharate pupal stage, in small dense granules (0.5–1 μm in. diameter).All the major protein bands of fat body extracts, which are resolved in electrophoresis, give the benzidine reaction and show incorporation of ¹⁴C-amino levulinic acids, in this case a specific marker for haemoglobin synthesis. In addition, labelled proteins show identical electrophoretic mobility as the haemoglobins of the haemolymph, suggesting that haemoglobins are synthesized in the fat body. Two types of fat body cells seem to differ with respect to their rôle in haemoglobin metabolism.     

Selenocystine-resistant mutants of Histoplasma capsulatum

Cysteine metabolism has been thought to be important to the phenomenon of dimorphism inHistoplasma capsulatum. We sought mutants with genetic blocks in the metabolism of cysteine by selection of colonies resistant to the toxic analogue, selenocystine. The 22 resistant strains thus obtained were all deficient in uptake of cystine from the surrounding medium but were normally able to convert from mycelium to yeast and back again. Furthermore, they had normal quantities of NADH-dependent cystine reductase when this enzyme was measured. We conclude that mutants defective in cystine uptake can be readily obtained by selection of colonies resistant to selenocystine, and that a lesion in cystine-uptake does not appear to affect the phenomenon of dimorphism in this organism.Preliminary reports of this work were presented at the Second International Congress of Mycology, Tampa, 1977 and at the first International Conference on Histoplasmosis, Atlanta, 1978.