Synthesis and evaluation of 1,3,5-triazine derivatives as sunscreens useful to prevent skin cancer

The incidence of skin cancers such as non-melanoma skin cancer and malignant melanoma has increased in the last few years mainly because of chronic exposure to ultraviolet (UV) radiation. Sunscreens protect the skin against harmful UV radiations; however, some limitations of these products justify the discovery of new UV filters. Novel 1,3,5-triazine derivatives (12a-h) obtained by the optimization of prototype resveratrol were synthesized and characterized. All compounds exhibited sun protection factor (SPF) and UVA protection factor (UVAPF) in the range of 3-17 and 3-13, respectively. These values were superior to resveratrol and the UV filter ethylhexyl triazone (EHT) currently available on the market. In addition, all compounds demonstrated in vitro antioxidant activity and thermal stability with the decomposition at temperatures above 236 °C. In conclusion, the novel 1,3,5-triazine derivatives have emerged as new UV filters with antioxidant effect useful to prevent skin cancer.

Endogenous fat loss and true total tract digestibility of poultry fat in adult dogs

Fat plays an important role in the carnivore diet. It has high digestibility and high energy content and likely improves digestibility of the diet when present in greater amounts, suggesting that endogenous fat adversely affects the apparent digestibility of fat in low-fat diets. This study aimed to determine the endogenous fat loss (EFL) and true total tract digestibility (TTTD) of fat in dogs by using diets having different fat:carbohydrate ratios. Furthermore, the apparent total tract digestibility (ATTD) of macronutrients and energy, food intake, fecal output, and stool quality were evaluated. Twelve adult Beagle dogs were stratified into three 10-d periods in a 6 × 3 balanced incomplete Latin square design. Dietary treatments included a low-fat basal diet (3.4% fat) supplemented with 6 poultry fat levels (1, 4, 10, 12, 16, or 20%). The dogs were individually housed in metabolic cages and fed to meet the maintenance energy requirements. The ME intake was similar across the diets, despite the clearly low palatability of the 1 and 4% fat diets. Dietary ATTD of DM, OM, fat, and GE were improved after fat inclusion ( < 0.001). The ATTD of CP was not affected by dietary fat increase ( > 0.05). The amount of fecal output decreased with increasing level of fat in the diet, but the fecal score was not affected. The stool quality was close to ideal (2.4-2.8) and no different among diets. The EFL was estimated using 2 regression methods and was expressed as 155 mg∙kg BW∙d or 7.9 g/kg of DMI. The TTTD of poultry fat was the same irrespective of the dietary fat level. Poultry fat was 99.3% digestible for the dogs. The relation between EFL and fat intake was higher for the lower-fat diets, explaining the ATTD of fat increase according to the dietary fat inclusion. In conclusion, dietary fat is well digested by dogs irrespective of the level included, close to 100%. The ATTD of fat in low-fat diets is underestimated because the endogenous content is proportionally greater than that in high-fat diets.

Synthesis, antioxidant and photoprotection activities of hybrid derivatives useful to prevent skin cancer

Chronic ultraviolet (UV) radiation exposure is a major cause of skin cancer. A novel series of hybrid derivatives (I-VIII) for use in sunscreen formulations were synthesized by molecular hybridization of t-resveratrol, avobenzone, and octyl methoxycinnamate, and were characterized. The antioxidant activity values for VIII were comparable than to those of t-resveratrol. Compounds I-III and VI demonstrated Sun Protector Factor superior to that of t-resveratrol. Compounds I and IV-VIII were identified as new, broad-spectrum UVA filters while II-III were UVB filters. In conclusion, novel hybrid derivatives with antioxidant effects have emerged as novel photoprotective agents for the prevention of skin cancer.

Design, synthesis, and pharmacological evaluation of novel hybrid compounds to treat sickle cell disease symptoms. part II: furoxan derivatives

Phthalimide derivatives containing furoxanyl subunits as nitric oxide (NO)-donors (3a-g) were designed, synthesized, and evaluated in vitro and in vivo for their potential uses in the oral treatment of sickle cell disease symptoms. All compounds (3a-g) demonstrated NO-donor properties at different levels. Moreover, compounds 3b and 3c demonstrated analgesic activity. Compound 3b was determined to be a promising drug candidate for the aforementioned uses, and it was further evaluated in K562 culture cells to determine its ability to increase levels of γ-globin expression. After 96 h at 5 μM, compound 3b was able to induce γ-globin expression by nearly three times. Mutagenic studies using micronucleus tests in peripheral blood cells of mice demonstrated that compound 3b reduces the mutagenic profile as compared with hydroxyurea. Compound 3b has emerged as a new leading drug candidate with multiple beneficial effects for the treatment of sickle cell disease symptoms and provides an alternative to hydroxyurea treatment.

Sleep in old age: focus on gender differences

A meta-analysis was conducted on 27 studies addressing gender differences on 31 indices of sleeping behavior of persons 58 years of age and older. All pertinent, original research articles published in the United States in the last decade were included. New findings were compared with summaries from earlier studies to complete a picture of current knowledge. Effect sizes were calculated for 23 variables related to sleep continuity, architecture, and pathology; and effect sizes were averaged across studies. Gender difference effect sizes were small to moderate, with men tending to show more objective changes from the patterns of healthy youthful sleep. Results underscore the importance of health providers having an understanding of gender and age in relation to sleep. Findings suggest the need to protect the lighter, more fragile sleep of the elderly; to encourage regularity in sleep patterns; and to use sleep-inducing medications with caution.

Family planning for teens: strategies for improving outreach and service delivery in public health settings

The persistent underuse of family planning services by inner-city, low-income, sexually active youth underscores the importance of testing innovative programs that maximize participation. Presented in this paper is an analysis of a Chicago public health clinic's special program for adolescents that originated from the staff's observations of the scheduling, educational, and support needs of teens seeking family planning services from a traditionally managed public health facility. Between December 1982, when the special program--the Teen Clinic--was implemented, and March 1985, more than 600 adolescents sought social support and contraceptive services--an 82 percent increase in new-patient registration compared with the enrollment before the program began. In contrast, two neighboring public health department facilities without special family planning programs for teens experienced either a small increase, 4 percent, or a modest decrease, 17 percent, in utilization by teenagers during the same period. The increased use of the study facility by teens, coupled with patients' self-reported nonuse of alternative sources of care and referral patterns, suggests that the new program was successful in recruiting sexually active teens who had previously been inadequately protected against pregnancy. The perceived institutional and interpersonal factors influencing 153 teens' initial and repeated use of the Teen Clinic, as measured by a structured survey, echo the findings of previous research. Strategies suggested by the study's findings for improving outreach and service delivery are described.

Preventing infant deaths: a descriptive study of one high-risk neighborhood

This study examines whether 72 infant deaths in one urban neighborhood in one year could have been prevented and if so, how. The neighborhood was targeted for a Maternal and Child Health Block Grant demonstration project because of its combination of low income and high rates of unemployment, teenage births, and infant mortality. Using a replicable set of decision rules, a committee consisting of a practicing obstetrician, a psychologist, and a social worker-epidemiologist used linked birth and death certificates to determine whether each death might have been prevented using available resources. Our criteria were designed to be somewhat conservative, in that no death was ruled preventable unless the evidence available from the birth or death certificate suggested that an available resource had clearly been called for and had not been used. Our results indicated that 25 percent of these infant deaths might have been prevented through the provision of maternal or infant transport, adequate prenatal care, immediate medical care, or alteration of the family environment. Each intervention is discussed in light of the particular circumstances of the neighborhood and current financial and political limitations.

Family life education for young teens: an assessment of three interventions

The impact of three variations of a family life education (FLE) program for 172 inner-city, junior-high-level students was investigated. Variations in exposure time, instructional methods, and teacher quality led to the classification of each intervention on a general intensity dimension. Separate pretest-posttest nonequivalent comparison group designs were utilized to assess program impact along seven knowledge and attitudinal dimensions. Survey results revealed that, in comparison to no-treatment groups, the more intensive the program (a) the greater the gains in knowledge about reproductive physiology, contraception, and the consequences of teen pregnancy and parenthood (especially among experimental group females); and (b) the more birth control methods participants became familiar with over time. Changes in personal acceptance of premarital intercourse and perceived responsibility for contraception were observed only in the study examining the most intensive treatment. The results of the evaluations point to the combined importance of instructional methods, teacher quality, and in-class exposure time for producing change in young adolescents' knowledge of and attitudes toward sexuality. Further potential for the impact of school-based sex education programs on knowledge and attitudes is discussed within the broader context of the young adolescent's social environment.

Family life education for young adolescents: A quasi-experiment

The impact of a family life education program for inner-city, minority elementary-school students was investigated. 2 randomly assigned groups of 7th and 8th graders (balanced for gender) completed a self administered survey, both before and after program implementation. In comaprison to the control group, program participants displayed (a) improved knowledge about contraception, reproductive physiology, an adolescent pregnancy outcomes; (b) increased awareness of the existence of specific birth control methods; (c) among 7th gradres, more conservative attitudes toward circumstances under which sexual intercourse was viewed as personally acceptable, and among8th graders, a shift toward more liberal attitudes; and (d) a greater tendency to acknowledge mutual responsibility for contraception. The impact of this intervention and school-based sex education programs in general is discussed within the broader context of the young adolescent's social environment.

A synopsis of federal-state sponsored preventive child health

This synopsis presents data on the impact of services and evaluation issues for the nation's largest preventive child health program, the Early and Periodic Screening, Diagnosis and Treatment program (EPSDT). The information is drawn from a series of six EPSDT demonstration/evaluation (D/E) projects sponsored by the Health Care Financing Administration between 1972 and 1979. These projects were implemented in order to learn how to provide preventive services for children participating in the Medicaid program. The results of D/E activities are revised in a methodological framework as defined by principles of epidemiology and evaluation research. Consideration of the major threats to valid interpretation of the D/E findings shows self-selection to be the most serious methodological problem. Data pertaining to the history of use of preventive services, number of children found to have problems in screening, the treatment status and subjective seriousness of these problems, and the resolution of conditions referred to diagnosis and treatment are presented within the context of this methodological critique. The information thus assembled also provides the basis for further, more rigorous assessments of EPSDT program accountability.