The mediation and moderation effect of social support on the relationship between opioid misuse and suicide attempts among native American youth in New Mexico: 2009-2019 Youth Risk Resiliency Survey (NM-YRRS).

BACKGROUND: Suicide attempt and opioid misuse continue to be major behavioral health challenges among American Indians and Alaska Natives (AI/AN). The aim of the study is to evaluate the mediating and moderating role that social support (SS) plays in their association among AI/AN high-school students in New Mexico (NM). METHODS: An aggregated NM Youth Resiliency and Risk Survey (NM-YRRS, 2009-2019: odd years) dataset was used. Multivariable logistic regression modeling and mediation analysis were conducted while adjusting for confounding variables. RESULTS: Overall, 12.0 and 14.0% of AI/AN students reported opioid misuse and suicide attempt, respectively. The adjusted odds ratio of suicide attempt in students with high SS relative to low SS who misused opioids was 0.43 (p-value = 0.007). The effect of high SS relative to low SS among males who misused opioids was more pronounced (AOR = 0.24, p-value < 0.0001) compared to females (AOR = 0.43, p-value = 0.007). Relative to low SS, high SS was protective for suicide attempt among AI/AN students who misused opioids and attended school in off-reservation (AOR = 0.42, p-value = 0.012) communities, rural communities (AOR = 0.44, p = 0.040), and in communities that are both rural and off-reservation (AOR = 0.39, p = 0.035). Overall, 23.64, and 41.05% of the association between opioid misuse, and suicide attempt was mediated and moderated by SS, respectively. The mediation effect of SS was lowest for rural, on-reservation schools. CONCLUSION: More resources need to be allocated to rural on-reservation schools to enhance social support. The study highlights key insights into the significant role SS plays in promoting health and mitigating the association between opioid misuse and suicide attempt.

A trend analysis of the prevalence of opioid misuse, social support, and suicide attempt among American Indian/Alaska native high school students in New Mexico: 2009-2019 Youth Risk Resiliency Survey (YRRS).

BACKGROUND: American Indian and Alaska Native (AI/AN) youth face stark inequities in opioid misuse, social support, and suicide attempt. This study examined trends in these behavioral measures among AI/AN students in New Mexico (NM). METHODS: Using the NM oversampled Youth Resiliency and Risk Survey (NM-YRRS, 2009 - 2019: odd years), prevalence estimates of opioid misuse, social support (SS), and suicide attempt for AI/AN high school students were generated. Trends over time were assessed via linear regression of weighted proportions according to Peter Armitage. Stratified trends by demographics were also employed. RESULTS: While the prevalence of suicide attempt did not change significantly over time, it was consistently higher among females (2011-2019), those who misused opioids, received low social support, had a mother with less than high school education, had a C, D, or F for academic performance, and non-straight students relative to their counterparts. In particular, the prevalence of suicide attempt among AI/AN students who reported opioid misuse in 2009 was significantly higher by 25.4% than their counterparts who did not report opioid misuse (35.8% vs. 10.4%.) A significant decreasing trend over time (2009-2017) was observed for opioid misuse (16.1%↓8.8%, p-value = 0.0033), including when stratifying by sex (males: 15.9%↓9%, p-value = 0.002; females: 16.2%↓8.6%, p-value = 0.012). Youth with high maternal education exhibited significant decline in opioid misuse (13.5%↓6.7%, p-value = 0.019; 2011-2017.) Opioid misuse increased significantly from 2017 to 2019 (8.8%↑12.9%, p-value < 0.0001.) For instance, in 2019 among AI/AN students who reported low social support, opioid misuse was roughly doubled (18.9% vs. 8.5%, p < 0.0001), and suicide attempt was tripled (21.3% vs. 7.0%, p < 0.0001) compared to students with high social support. CONCLUSION: No significant trend was observed for suicide attempt. We observed a significant decreasing trend in opioid misuse between 2009 through 2017 but a significant increase from 2017 to 2019. A higher level of maternal education (college or above), and an A or B school grade performance were protective against both opioid misuse and suicide attempt.

Cell surface proteins play an important role in probiotic activities of Lactobacillus reuteri

BACKGROUND: Eight Lactobacillus reuteri strains, previously isolated from breast-fed human infant feces, were selected to assess the potential contribution of their surface proteins in probiotic activity. These strains were treated with 5 M LiCl to remove their surface proteins, and their tolerance to simulated stomach-duodenum passage, cell surface characteristics, auto aggregation, adhesion, and inhibition of pathogen adhesion to Caco-2 cells were compared with untreated strains. RESULTS: The survival rates, auto aggregation, and adhesion abilities of the LiCl-treated L. Reuteri strains decreased significantly (p< 0.05) compared to that of the untreated cells. The inhibition ability of selected L. reuteri strains, untreated or LiCl treated, against adherence of Escherichia coli 25922 and Salmonella typh iNCDC113 to Caco-2 was evaluated in vitro with L. reuteri ATCC55730 strain as a positive control. Among the selected eight strains of L.reuteri, LR6 showed maximum inhibition against the E. Coli ATCC25922 and S. typhiNCDC113. After treatment with 5 M LiCl to remove surface protein, the inhibition activities of the lactobacilli against pathogens decreased significantly (p< 0.05). Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) analysis indicated thatLR6 strains had several bands with molecular weight ranging from 10 to 100 KDa, and their characterization and functions need to be confirmed. CONCLUSIONS: The results revealed that the cell surface proteins of L. reuteri play an important role in their survivability, adhesion, and competitive exclusion of pathogen to epithelial cells.