Lifetime physical inactivity is associated with increased risk for Hodgkin and non-Hodgkin lymphoma: A case-control study

BACKGROUND

Although physical activity is a well-established risk factor for several cancer types, studies evaluating its association with lymphoma have yielded inconclusive results. In such cases where physical activity is not clearly associated with cancer risk in a dose-dependent manner, investigators have begun examining physical inactivity as an independent exposure of interest.

METHODS

Associations of self-reported, lifetime physical inactivity with risk of developing Hodgkin lymphoma (HL) and non-Hodgkin lymphoma (NHL) were evaluated in a hospital-based case control study using data from the Patient Epidemiology Data System at Roswell Park Comprehensive Cancer Center. Participants included 87 patients with HL and 236 patients with NHL as well as 348 and 952 cancer-free controls, respectively. Multivariable-adjusted logistic regression models were fit to calculate odds ratios (OR) and 95% confidence intervals (CI) estimating the association between physical inactivity and lymphoma risk.

RESULTS

We observed significant, positive associations between lifetime recreational physical inactivity and risk of both HL (OR = 1.90, 95% CI: 1.15-3.15) and NHL (OR = 1.35, 95% CI: 1.01-1.82).

CONCLUSIONS

The current analysis provides evidence for a positive association between physical inactivity and risk of both HL and NHL. These results add to a growing body of research suggesting that lifetime physical inactivity may be an important independent, modifiable behavioral risk factor for cancer.

Ascertainment of Unmet Needs and Participation in Health Maintenance and Screening of Adult Hematopoietic Cell Transplantation Survivors Followed in a Formal Survivorship Program

This study aimed to ascertain unmet needs in autologous and allogeneic hematopoietic cell transplantation (HCT) recipients actively followed in an established long-term survivorship clinic at Roswell Park Cancer Institute from 2006 to 2012. The Survivor Unmet Needs Survey (SUNS) was mailed to 209 eligible patients and returned by 110 (53% participation rate). SUNS includes 89 items covering 5 domains: Emotional Health, Access and Continuity of Care, Relationships, Financial Concerns, and Information. The top 5 specific unmet needs for autologous HCT patients were inability to set future goals/long-term plans, changes in appearance, bad memory/lacking focus, losing confidence in abilities, and paying household or other bills. For allogeneic HCT patients these 5 unmet needs were tied at 21% of respondents: ability to earn money, pay bills, feeling tired, feeling depressed, and dealing with others' expectations of "returning to normal." The top 5 needs reported by females were all from the emotional health domain, whereas males reported financial domain unmet needs. Self-reported participation in health maintenance and screening tests varied greatly from 88% of patients having routine annual bloodwork to 13% of patients having an exercise stress test in the past year. Our findings demonstrate unmet needs in emotional health and financial burden in HCT survivors and variable compliance with survivorship screening.

A history of the discovery of random x chromosome inactivation in the human female and its significance

Genetic determinants of sex in placental mammals developed by the evolution of primordial autosomes into the male and female sex chromosomes. The Y chromosome determines maleness by the action of the gene SRY, which encodes a protein that initiates a sequence of events prompting the embryonic gonads to develop into testes. The X chromosome in the absence of a Y chromosome results in a female by permitting the conversion of the embryonic gonads into ovaries. We trace the historical progress that resulted in the discovery that one X chromosome in the female is randomly inactivated in early embryogenesis, accomplishing approximate equivalency of X chromosome gene dosage in both sexes. This event results in half of the somatic cells in a tissue containing proteins encoded by the genes of the maternal X chromosome and half having proteins encoded by the genes of the paternal X chromosome, on average, accounting for the phenotype of a female heterozygote with an X chromosome mutation. The hypothesis of X chromosome inactivation as a random event early in embryogenesis was first described as a result of studies of variegated coat color in female mice. Similar results were found in women using the X chromosome-linked gene, glucose-6-phosphate dehydrogenase, studied in red cells. The random inactivation of the X chromosome-bearing genes for isoenzyme types A and B of glucose-6-phosphate dehydrogenase was used to establish the clonal origin of neoplasms in informative women with leiomyomas. Behind these discoveries are the stories of the men and women scientists whose research enlightened these aspects of X chromosome function and their implication for medicine.

Analysis of the 2.0 A crystal structure of the protein-DNA complex of the human PDEF Ets domain bound to the prostate specific antigen regulatory site

PDEF, a prostate epithelial specific transcription factor, is a member of the Ets family of DNA binding proteins. Here we report a 2.0 A crystal structure of the PDEF Ets domain in complex with a natural, high-affinity DNA binding site in the promoter/enhancer region of the human prostate specific antigen gene. Comparison of the PDEF-DNA complex with other Ets complexes revealed key features that are shared among Ets members, as well as important differences in substrate specification at both the "GGA" core and the flanking regions of the DNA site. The combination of the serine residue at position 308 and the glutamine at position 311 explains the previous observation that the PDEF binds preferentially to a thymine at the +4 position of its binding site. Despite the common essential features that are shared among Ets members, PDEF demonstrates distinct patterns of interactions at different positions of DNA in achieving sequence specific recognition. Collectively, the common and unique interactions with both the DNA bases and the backbone phosphates lead to substrate specificity and individual preference for certain DNA sites.

Mitochondrial oxygen consumption is synergistically inhibited by metallothionein and calcium

OBJECTIVE

To determine the combined effect of metallothionein and calcium on the oxygen consumption of mitochondria.

BACKGROUND

We previously showed that mitochondrial oxygen consumption was inhibited by the intracellular acute-phase reactant, metallothionein, which is rapidly induced by nearly all stressed cells. Other investigators have demonstrated that calcium also inhibited oxygen consumption. However, the calcium concentrations used in their experiments were supraphysiologic. Our hypothesis was that metallothionein would enhance the effect of calcium.

METHODS

We conducted these experiments, of a paired design, on the effects of combinations of metallothionein and calcium using mitochondria isolated from rat liver. An oxygen electrode implanted into a 600-microliter chamber with a stir bar was used to measure oxygen consumption. Various concentrations of calcium, metallothionein, and other reagents were added while oxygen consumption was being continuously recorded. Metals were removed from metallothionein by gel filtration to produce apometallothionein.

RESULTS

Physiological levels of metallothionein synergistically enhanced the inhibitory effect of calcium so that its action occurred at physiological concentrations. Metallothionein devoid of its metals, zinc and cadmium, had no effect on oxygen consumption.

CONCLUSION

In isolated mitochondria metallothionein inhibits ADP-initiated oxygen consumption. This effect is synergistic with the inhibitory action of calcium. These observations suggest a possible enhancement by metallothionein of the effect of fluxes in intracellular calcium in stressed cells.

Metallothionein-induced increase in mitochondrial inner membrane permeability

OBJECTIVE

To elucidate the effect of metallothionein on the permeability of the mitochondrial inner membrane.

BACKGROUND

Metallothionein (MT) is a 6-7-kDa protein which is rapidly produced by stressed cells. MT is induced by cytokines and other factors thought to mediate the stress response. The organelle with the highest concentration of MT is the mitochondrion. Therefore we studied the effect of MT on mitochondrial function. We chose to study the effect of MT on mitochondrial inner membrane permeability because of the role of this function in numerous cellular processes.

METHODS

Mitochondria were isolated from livers of Sprague-Dawley rats by differential centrifugation and suspended in sucrose-containing buffer. Changes in mitochondrial inner membrane permeability were monitored by following the change in absorbance at 540 nm. All experiments were of a paired design.

RESULTS

We found that an increase in inner membrane permeability was induced by physiological metallothionein 1 (MT1) concentrations between 6 and 50 microM. There was no increase in the effect beyond 50 microM. The metals of MT1, zinc, and cadmium alone had no effect at physiological concentrations. The action of MT1 was inhibited by the aliphatic polyamine, spermine, as well as magnesium both at physiological concentrations. Spermine was effective whether added before or after MT1. Metallothionein 2 of different Zn2+ and Cd2+ compositions induced different kinetics of pore opening.

CONCLUSIONS

These experiments reveal the possibility that the permeability of the mitochondrial inner membrane is regulated by relative concentrations of MT, spermine, and magnesium. The metal composition of MT could also play a role in this regulation.

Opposite effects of metallothionein I and spermine on mitochondrial function

Previously, we reported that the stress-induced protein metallothionein I (MT) modulated the oxygen consumption (VO2) of isolated rat liver mitochondria [Life Sci. 55 221-226, 1994]. We now present confirmation of this finding, and the additional observations that in rat liver mitochondria, MT caused swelling and depolarization. These actions of MT were inhibited by the aliphatic polyamine, spermine. Our findings suggest that mitochondrial function could be influenced by the balance between MT and spermine.

Single-dose antimicrobial prophylaxis in open heart surgery

A single one-gram pre-operative dose of ceftriaxone was compared with seven one-gram doses of cefazolin administered peri-operatively with the aim of preventing infections associated with coronary artery bypass graft surgery. Ninety-four evaluable cases were analyzed; 49 patients received ceftriaxone and 45 received cefazolin. There was no significant difference in the number of infectious complications between the two groups. Ceftriaxone had a terminal half-life of approximately 15.7 hours. There was no toxicity associated with either antibiotic. Because of the reduced number of doses, single-dose prophylaxis may result in considerable savings. Single-dose prophylaxis with ceftriaxone was found to be an effective modality for prevention of infection in open heart surgery.

A comparison of the safety, efficacy, and distribution of ceforanide and cephalothin in coronary artery bypass graft surgery

Antibiotic prophylaxis in open-heart operations is a widely accepted practice. Introduction of new antibiotics with differences in tissue distribution, spectrum of activity and therapeutic index prompts their evaluation as possible effective prophylactic agents. We compared the distribution, clinical efficacy, and safety of ceforanide with cephalothin as a prophylactic agent in coronary artery bypass graft (CABG) procedures. The results indicated that the intravenous administration of ceforanide at the dose of 1 gm every 12 hours for 2.5 days was equivalent to cephalothin 1 gm every 6 hours for 2.5 days. Serum, muscle, and bone concentrations of ceforanide were significantly greater than those of cephalothin. These concentrations consistently exceeded the minimal inhibitory concentration for Staphylococcus aureus, the major pathogen implicated in wound infections. No toxicty was observed with either antibiotic. Ceforanide merits consideration as a prophylactic antibiotic in CABG operations.