Displacement imposition scale assesses reactions of cigarette and e-cigarette users impacted by a campus-wide smoking ban.

OBJECTIVE: The present study developed a measure assessing the emotional responses, "Displacement Imposition," of cigarette and e-cigarette users on a college campus with a smoking/vaping ban. It also examined the relationship between Displacement Imposition and readiness to quit smoking/vaping, and how this relationship differed between cigarette and e-cigarette users. PARTICIPANTS: Participants (N = 297) were from a large, Midwestern university. METHODS: Participants completed online questionnaires assessing demographics, cigarette and e-cigarette use, Displacement Imposition, and readiness to quit. RESULTS: All six Displacement Imposition items loaded onto a single factor. A significant interaction emerged between Displacement Imposition and product use in predicting readiness to quit. At high levels of Displacement Imposition, cigarette users were less ready to quit than e-cigarette users. CONCLUSIONS: Findings suggest restrictions imposed on cigarette and e-cigarette users were associated with reduced readiness to quit. Findings inform tobacco control policies as tobacco denormalization may increase the burden placed on tobacco users.

Intentions to Reduce Alcohol Use Following Brief Alcohol-Related Health Messages Among College Students.

OBJECTIVE: Health care providers using brief alcohol-related health messaging is an effective manner of reducing risky drinking; however, research is needed to guide the content of such messages. The present study compared current drinkers' and nondrinkers' perspectives on the value of four different alcohol-related messages and the hypothetical impact of the messages on intentions to reduce drinking. METHOD: Undergraduates (n = 286 current drinkers, n = 101 nondrinkers) from a large, public, Southern Plains university identified primarily as White (82.9%) and female (70%), with a mean age of 19.98 years. They viewed four video recordings containing different alcohol-related messages in random order and were asked to rate how likely they were to change their drinking behaviors after watching each video. RESULTS: All participants generally had a comparably positive appraisal of all four messages. Among current drinkers, one-way analyses of variance revealed significant differences across messages for intention to change drinking frequency, F(3, 260) = 5.69, p = .001, ηp2 = .06, and quantity, F(3, 263) = 4.95, p = .002, ηp2 = .05. Post hoc tests showed that the condition warning students of severe consequences resulted in higher intentions to reduce drinking compared with other conditions describing less severe consequences, drinking norms, or protective behavioral strategies. No significant differences emerged among nondrinkers. CONCLUSIONS: Despite mixed research regarding the effectiveness of fear-based warning messages in reducing high-risk drinking, the message containing severe alcohol-related consequences evoked the greatest hypothetical intentions to reduce quantity and frequency of drinking. Future studies should track actual drinking behaviors longitudinally following each message.

Harmful Algal Bloom Toxicity in Lithobates catesbeiana Tadpoles.

Harmful algal blooms (HAB) have become a major health concern worldwide, not just to humans that consume and recreate on contaminated waters, but also to the fauna that inhabit the environments surrounding affected areas. HABs contain heterotrophic bacteria, cyanobacterial lipopolysaccharide, and cyanobacterial toxins such as microcystins, that can cause severe toxicity in many aquatic species as well as bioaccumulation within various organs. Thus, the possibility of trophic transference of this toxin through the food chain has potentially important health implications for other organisms in the related food web. While some species have developed adaptions to attenuate the toxic effects of HAB toxins, there are still numerous species that remain vulnerable, including Lithobates catesbeiana (American bullfrog) tadpoles. In the current study we demonstrate that acute, short-term exposure of tadpoles to HAB toxins containing 1 µg/L (1 nmol/L) of total microcystins for only 7 days results in significant liver and intestinal toxicity within tadpoles. Exposed tadpoles had increased intestinal diameter, decreased intestinal fold heights, and a constant number of intestinal folds, indicating pathological intestinal distension, similar to what is seen in various disease processes, such as toxic megacolon. HAB-toxin-exposed tadpoles also demonstrated hepatocyte hypertrophy with increased hepatocyte binucleation consistent with carcinogenic and oxidative processes within the liver. Both livers and intestines of HAB-toxin-exposed tadpoles demonstrated significant increases in protein carbonylation consistent with oxidative stress and damage. These findings demonstrate that short-term exposure to HAB toxins, including microcystins, can have significant adverse effects in amphibian populations. This acute, short-term toxicity highlights the need to evaluate the influence HAB toxins may have on other vulnerable species within the food web and how those may ultimately also impact human health.

CD40 Receptor Knockout Protects against Microcystin-LR (MC-LR) Prolongation and Exacerbation of Dextran Sulfate Sodium (DSS)-Induced Colitis.

Inflammatory Bowel Disease (IBD) is one of the most common gastrointestinal (GI) disorders around the world, and includes diagnoses such as Crohn's disease and ulcerative colitis. The etiology of IBD is influenced by genetic and environmental factors. One environmental perturbagen that is not well studied within the intestines is microcystin-leucine arginine (MC-LR), which is a toxin produced by cyanobacteria in freshwater environments around the world. We recently reported that MC-LR has limited effects within the intestines of healthy mice, yet interestingly has significant toxicity within the intestines of mice with pre-existing colitis induced by dextran sulfate sodium (DSS). MC-LR was found to prolong DSS-induced weight loss, prolong DSS-induced bloody stools, exacerbate DSS-induced colonic shortening, exacerbate DSS-induced colonic ulceration, and exacerbate DSS-induced inflammatory cytokine upregulation. In addition, we previously reported a significant increase in expression of the pro-inflammatory receptor CD40 in the colons of these mice, along with downstream products of CD40 activation, including plasminogen activator inhibitor-1 (PAI-1) and monocyte chemoattractant protein-1 (MCP-1). In the current study, we demonstrate that knocking out CD40 attenuates the effects of MC-LR in mice with pre-existing colitis by decreasing the severity of weight loss, allowing a full recovery in bloody stools, preventing the exacerbation of colonic shortening, preventing the exacerbation of colonic ulceration, and preventing the upregulation of the pro-inflammatory and pro-fibrotic cytokines IL-1ß, MCP-1, and PAI-1. We also demonstrate the promising efficacy of a CD40 receptor blocking peptide to ameliorate the effects of MC-LR exposure in a proof-of-concept study. Our findings suggest for the first time that MC-LR acts through a CD40-dependent mechanism to exacerbate colitis.