Nutrition and Other Protective Behaviors Motivated by Environmental Health Risk Awareness.

BACKGROUND: Research findings have suggested that exposure to environmental pollutants contributes to increased health risks, which may be modulated by certain nutrition and other protective health behaviors. Nutrition professionals play an important role in effectively disseminating this information and in devising specific community-based nutrition education programs for audiences located in areas with environmental health issues. OBJECTIVE: To assess awareness of environmental health problems and motivation to adopt protective health behaviors for use in planning nutrition education programs for communities exposed to environmental pollutants. METHOD: Data were collected from a modified, validated Environmental Health Engagement Profile (EHEP) survey instrument administered to adults (n=774) participating in community events in Kentucky based on location relative to hazardous waste sites. RESULTS: The modified EHEP survey instrument showed good internal consistency reliability, and demographic characteristics were evaluated. Correlation analyses revealed significant positive correlations in all groups, separately and combined, between awareness of environmental pollution in an individual's surroundings and the extent of concern that pollutants cause adverse health effects (P < 0.01) and between concern that pollutants cause adverse health effects and taking personal actions to protect against such environmental insults (P < 0.01). The groups having the highest level of awareness posed by pollution are those residing near federally designated hazardous waste sites. CONCLUSION: These results suggest that determining and expanding an audience's knowledge and perceptions of environmental health risks will enhance effective nutrition education program planning.

The environmental health engagement profile: what people think and do about environmental health.

OBJECTIVES: To develop and validate the Environmental Health Engagement Profile (EHEP)-an instrument for assessing the way people engage with environmental health issues, including people's experience of environmental health hazards, the assumptions concerning the risks involved, and the actions taken either individually or collectively in their communities. DESIGN AND SAMPLE: This instrument development study was conducted in an urban area with varying levels of health-related environmental concerns. First, qualitative interviews with 41 residents informed development of items. Next, the items were evaluated by 28 expert reviewers. Finally, validity was assessed from responses of 433 residents who completed the instrument and other measures by telephone interview. MEASURES: For assessing validity of EHEP, data were also collected concerning demographic characteristics, social involvements, goodness of life, and self-ratings of health. RESULTS: Through factor analysis, 5 subscales were identified-named Pollution Sensitivity Scale (alpha=.91), Pollution-Causes-Illness Scale (alpha=.84), Pollution Acceptance Scale (alpha=.67), Community Environment Action Scale (alpha=.79), and Personal Environmental Action Scale (alpha=.63). Patterns of correlations of these scales with age, and measures of odor sensitivity, social involvement, and goodness of life provided evidence of construct validity. CONCLUSIONS: These results provide beginning evidence for the reliability and validity of the EHEP. Thus, public health nurses and others may use this instrument to assess people's concerns about environmental health, and resulting actions-and to support strategies for advising people and communities on protecting their health.

Synthetic chemerin-derived peptides suppress inflammation through ChemR23.

Chemerin is a chemotactic protein that binds to the G protein-coupled receptor, ChemR23. We demonstrate that murine chemerin possesses potent antiinflammatory properties that are absolutely dependent on proteolytic processing. A series of peptides was designed, and only those identical to specific C-terminal chemerin sequences exerted antiinflammatory effects at picomolar concentrations in vitro. One of these, chemerin15 (C15; A(140)-A(154)), inhibited macrophage (MPhi) activation to a similar extent as proteolyzed chemerin, but exhibited reduced activity as a MPhi chemoattractant. Intraperitoneal administration of C15 (0.32 ng/kg) to mice before zymosan challenge conferred significant protection against zymosan-induced peritonitis, suppressing neutrophil (63%) and monocyte (62%) recruitment with a concomitant reduction in proinflammatory mediator expression. Importantly, C15 was unable to ameliorate zymosan-induced peritonitis in ChemR23(-/-) mice, demonstrating that C15's antiinflammatory effects are entirely ChemR23 dependent. In addition, administration of neutralizing anti-chemerin antibody before zymosan challenge resulted in a significant exacerbation of peritoneal inflammation (up to 170%), suggesting an important endogenous antiinflammatory role for chemerin-derived species. Collectively, these results show that chemerin-derived peptides may represent a novel therapeutic strategy for the treatment of inflammatory diseases through ChemR23.

Hypogonadotropic hypogonadism in mice lacking a functional Kiss1 gene.

The G protein-coupled receptor GPR54 (AXOR12, OT7T175) is central to acquisition of reproductive competency in mammals. Peptide ligands (kisspeptins) for this receptor are encoded by the Kiss1 gene, and administration of exogenous kisspeptins stimulates hypothalamic gonadotropin-releasing hormone (GnRH) release in several species, including humans. To establish that kisspeptins are the authentic agonists of GPR54 in vivo and to determine whether these ligands have additional physiological functions we have generated mice with a targeted disruption of the Kiss1 gene. Kiss1-null mice are viable and healthy with no apparent abnormalities but fail to undergo sexual maturation. Mutant female mice do not progress through the estrous cycle, have thread-like uteri and small ovaries, and do not produce mature Graffian follicles. Mutant males have small testes, and spermatogenesis arrests mainly at the early haploid spermatid stage. Both sexes have low circulating gonadotropin (luteinizing hormone and follicle-stimulating hormone) and sex steroid (beta-estradiol or testosterone) hormone levels. Migration of GnRH neurons into the hypothalamus appears normal with appropriate axonal connections to the median eminence and total GnRH content. The hypothalamic-pituitary axis is functional in these mice as shown by robust luteinizing hormone secretion after peripheral administration of kisspeptin. The virtually identical phenotype of Gpr54- and Kiss1-null mice provides direct proof that kisspeptins are the true physiological ligand for the GPR54 receptor in vivo. Kiss1 also does not seem to play a vital role in any other physiological processes other than activation of the hypothalamic-pituitary-gonadal axis, and loss of Kiss1 cannot be overcome by compensatory mechanisms.

Stella is a maternal effect gene required for normal early development in mice.

stella is a novel gene specifically expressed in primordial germ cells, oocytes, preimplantation embryos, and pluripotent cells. It encodes a protein with a SAP-like domain and a splicing factor motif-like structure, suggesting possible roles in chromosomal organization or RNA processing. Here, we have investigated the effects of a targeted mutation of stella in mice. We show that while matings between heterozygous animals resulted in the birth of apparently normal stella null offspring, stella-deficient females displayed severely reduced fertility due to a lack of maternally inherited Stella-protein in their oocytes. Indeed, we demonstrate that embryos without Stella are compromised in preimplantation development and rarely reach the blastocyst stage. stella is thus one of few known mammalian maternal effect genes, as the phenotypic effect on embryonic development is mainly a consequence of the maternal stella mutant genotype. Furthermore, we show that STELLA that is expressed in human oocytes is also expressed in human pluripotent cells and in germ cell tumors. Interestingly, human chromosome 12p, which harbours STELLA, is consistently overrepresented in these tumors. These findings suggest a similar role for STELLA during early human development as in mice and a potential involvement in germ cell tumors.

An integrative model for environmental health research.

Environmental health research must achieve an integration of understanding, reaching from physiological research on health effects of toxic agents to actions that people may take, individually and collaboratively, to reduce their risks. This article proposes an integrative model of environmental health, encompassing four broad domains and their interrelationships: physiological, vulnerability, epistemological, and health protection. If we wish to empower communities to make the tough decisions necessary to truly protect the well-being of their most vulnerable members, each domain must be attended to, and links between scientific knowledge and social processes must be understood.