The Culture is Prevention Project: measuring cultural connectedness and providing evidence that culture is a social determinant of health for Native Americans.

BACKGROUND: It is important for non-Native persons to understand that the meaning of culture to Native American/Indigenous Peoples is not about esteem, taste or music but rather is described as a cognitive map on how to be. Native American/Indigenous culture can be thought of as all the things and ways in which Native/Indigenous people understand who they are, where they come from and how they are to interact with others. Hundreds of years across many generations have taught that culture-based activities and interventions improve Native/Indigenous health and wellbeing. We explore if increased Native American culture/cultural connectedness is associated with better mental health/well-being and physical health. METHODS: We analyzed data from a two-phased study (N = 259 and N = 102) of 361 urban Native Americans in California (2018-2021). The 29 items validated Cultural Connectedness Scale-California (CCS-CA) measured Native culture/cultural connectedness. Mental health/well-being and physical health were assessed using the: modified Herth Hope Index (mHHI), Satisfaction with Life (SWL), Center for Epidemiologic Studies Depression Scale-Revised (CESD-R-10), Substance Abuse (CAGE-AID), and Health Related Quality of Life (HRQOL). We conducted Pearson correlations and stepwise regression analyses with CCS-CA as the independent (predictor) variable to explore our main research questions: 1) Is increased Native American/Indigenous culture associated with: 1) better mental health/well-being; and 2) better physical health? RESULTS: Increased Native/Indigenous culture (CCS-CA scores) is significantly associated with better mental health/well-being (mHHI, p < .001) and satisfaction with life (SWL, p < .001) predicts good physical health days (HRQOL, p < .001). Increased connection to Native American/Indigenous culture (CCS-CA scores) is significantly associated with decreased risk for depression (CESD-R-10, p < .0) and substance abuse and (CAGE-AID, p < .07). Significant results for culture as protective against risk for substance abuse (CAGE-AID) was most likely affected (p value approaching significance) due to an error in language on the measure (i.e., created double negative). CONCLUSIONS: Native American/Indigenous culture is a predictor of improved outcomes for mental health/well-being and physical healthy days. Native culture is an important social determinant of health. We add to the evidence that Native/Indigenous culture (i.e., cultural connectedness) be considered an important intervention objective and health-related outcome measure.

The Culture is Prevention Project: Measuring Culture As a Social Determinant of Mental Health for Native/Indigenous Peoples.

This paper reports Phase 4 of the Culture is Prevention Project where we validated the Cultural Connectedness Scale - California (CCS-CA) with a sample of 344 Indigenous adults in the San Francisco Bay Area, California. In Phase 3 of this project, the CCS-CA was modified from the original Canadian Cultural Connectedness Scale (CCS) developed by Dr. Angela Snowshoe and colleagues to be a better fit for the more multi-tribal communities in urban California. Both the CCS-CA and CCS consist of 29 items that measure culture on 3 sub-scales: identity, traditions, and spirituality. The project demonstrated a positive link between cultural connectedness and mental health/well-being using the Herth Hope Index. We report results similar to the original CCS study by Snowshoe et al., where we found the CCS-CA to be a valid and reliable strength-based instrument and to support the conclusion that culture is a social determinant of mental health/well-being for Indigenous/Native peoples.

Identification of dendritic antigen-presenting cells in the zebrafish.

In mammals, dendritic cells (DCs) form the key link between the innate and adaptive immune systems. DCs act as immune sentries in various tissues and, upon encountering pathogen, engulf and traffic foreign antigen to secondary lymphoid tissues, stimulating antigen-specific T lymphocytes. Although DCs are of fundamental importance in orchestrating the mammalian immune response, their presence and function in nonmammalian vertebrates is largely unknown. Because teleosts possess one of the earliest recognizable adaptive immune systems, we sought to identify antigen-presenting cells (APCs) in the zebrafish to better understand the potential origins of DCs and their evolutionary relationship to lymphocytes. Here we present the identification and characterization of a zebrafish APC subset strongly resembling mammalian DCs. Rare DCs are present in various adult tissues, and can be enriched by their affinity for the lectin peanut agglutinin (PNA). We show that PNA(hi) myeloid cells possess the classical morphological features of mammalian DCs as revealed by histochemical and ultrastructural analyses, phagocytose-labeled bacterial preparations in vivo, and exhibit expression of genes associated with DC function and antigen presentation, including il12, MHC class II invariant chain iclp1, and csf1r. Importantly, we show that PNA(hi) cells can activate T lymphocytes in an antigen-dependent manner. Together, these studies suggest that the cellular constituents responsible for antigen presentation are remarkably conserved from teleosts to mammals, and indicate that the zebrafish may serve as a unique model to study the origin of APC subsets and their evolutionary role as the link between the innate and adaptive immune systems.

Eosinophils in the zebrafish: prospective isolation, characterization, and eosinophilia induction by helminth determinants.

Eosinophils are granulocytic leukocytes implicated in numerous aspects of immunity and disease. The precise functions of eosinophils, however, remain enigmatic. Alternative models to study eosinophil biology may thus yield novel insights into their function. Eosinophilic cells have been observed in zebrafish but have not been thoroughly characterized. We used a gata2:eGFP transgenic animal to enable prospective isolation and characterization of zebrafish eosinophils, and demonstrate that all gata2(hi) cells in adult hematopoietic tissues are eosinophils. Although eosinophils are rare in most organs, they are readily isolated from whole kidney marrow and abundant within the peritoneal cavity. Molecular analyses demonstrate that zebrafish eosinophils express genes important for the activities of mammalian eosinophils. In addition, gata2(hi) cells degranulate in response to helminth extract. Chronic exposure to helminth- related allergens resulted in profound eosinophilia, demonstrating that eosinophil responses to allergens have been conserved over evolution. Importantly, infection of adult zebrafish with Pseudocapillaria tomentosa, a natural nematode pathogen of teleosts, caused marked increases in eosinophil number within the intestine. Together, these observations support a conserved role for eosinophils in the response to helminth antigens or infection and provide a new model to better understand how parasitic worms activate, co-opt, or evade the vertebrate immune response.

Architectural and morphological assessment of rat abdominal wall muscles: comparison for use as a human model.

The abdominal wall is a composite of muscles that are important for the mechanical stability of the spine and pelvis. Tremendous clinical attention is given to these muscles, yet little is known about how they function in isolation or how they interact with one another. Given the morphological, vascular, and innervation complexities associated with these muscles and their proximity to the internal organs, an appropriate animal model is important for understanding their physiological and mechanical significance during function. To determine the extent to which the rat abdominal wall resembles that of human, 10 adult male Sprague-Dawley rats were killed and formalin-fixed for architectural and morphological analyses of the four abdominal wall muscles (rectus abdominis, external oblique, internal oblique, and transversus abdominis). Physiological cross-sectional areas and optimal fascicle lengths demonstrated a pattern that was similar to human abdominal wall muscles. In addition, sarcomere lengths measured in the neutral spine posture were similar to human in their relation to optimal sarcomere length. These data indicate that the force-generating and length change capabilities of these muscles, relative to one another, are similar in rat and human. Finally, the fiber lines of action of each abdominal muscle were similar to human over most of the abdominal wall. The main exception was in the lower abdominal region (inferior to the pelvic crest), where the external oblique becomes aponeurotic in human but continues as muscle fibers into its pelvic insertion in the rat. We conclude that, based on the morphology and architecture of the abdominal wall muscles, the adult male Sprague-Dawley rat is a good candidate for a model representation of human, particularly in the middle and upper abdominal wall regions.