Sexualized substance use among gbMSM: Their perspectives on their intervention needs and counsellor competencies.

INTRODUCTION: Treatments for problematic substance use by gay, bisexual and other men who have sex with men (gbMSM) in sexualized contexts must be adapted to take sociocultural aspects of these sexual practices into account. When treatment programs factor in sexuality, they most commonly address it from a biological perspective (STTBIs, HIV). This article sets out to identify intervention needs related to sexualized substance use (SSU) from the perspective of gbMSM, taking into consideration different dimensions of sexuality to offer more effective support. METHODS: Twenty adult gbMSM, each of whom had previously participated in addiction-related treatment programs, took part in this study. We recruited through medical clinics, community organizations, social media advertising and word of mouth. Through one-on-one semi-structured interviews, participants shared their perspectives on the treatment they had received, how their sexuality had been addressed during treatment, and their perceptions of their treatment-related needs and requirements. The study analyzed and interpreted the data gathered during these interviews using a conceptual framework of sexual health combined with The Competencies, a model for addiction counselling training. RESULTS: When the study asked participants what they would consider beneficial in terms of SSU-related treatment, they identified certain key competencies. These can be broken down into three categories - knowledge, skills and attitudes - that, together, participants perceived as critical to the development of adequate programs and services. While participants reported addiction-related knowledge was important, so too was an understanding of sexuality (e.g., sexual practices, gbMSM communities, sociocultural norms). With regard to attitudes, the study identified respect, non-judgment, acceptance and empathy as themes for most participants. Lastly, the desired skills were those permitting counsellors and other treatment providers to better align programs and services with each individual's singular reality within the context of their substance use. CONCLUSIONS: The results of this study suggest that, to provide treatment programs adapted to the needs of gbMSM in a context of SSU, knowledge must be consolidated and new skills developed. Furthermore, both knowledge and skills need to be placed within an overarching perspective of cultural humility. Overall, improving these various competencies should improve the continuum of care in addiction treatment.

Chemsex and incidence of sexually transmitted infections among Canadian pre-exposure prophylaxis (PrEP) users in the l'Actuel PrEP Cohort (2013-2020).

OBJECTIVES: Use of illicit substances during sex (chemsex) may increase transmission of HIV and other STIs. Pre-exposure prophylaxis (PrEP) is highly effective at preventing HIV transmission, providing an important prevention tool for those who practise chemsex. However, it does not prevent acquisition of other STIs. We aim to examine the impact of chemsex on STI incidence among gay, bisexual and other men who have sex with men (gbMSM), and transgender women using PrEP in Montréal, Canada. METHODS: We linked baseline sociodemographic and behavioural data with follow-up STI testing from 2013 to 2020 among PrEP users in the l'Actuel PrEP Cohort (Canada). Focusing on the 24 months following PrEP initiation, we estimated the effect of chemsex reported at baseline on cumulative incidence of gonorrhoea and chlamydia using Kaplan-Meier curves and survival analyses. We investigated the role of polysubstance use and effect modification by sociodemographic factors. RESULTS: There were 2086 clients (2079 cisgender gbMSM, 3 transgender gbMSM, 4 transgender women) who initiated PrEP, contributing 1477 years of follow-up. There were no incident HIV infections among clients on PrEP. Controlling for sociodemographic confounders, clients reporting chemsex at baseline had a 32% higher hazard of gonorrhoea/chlamydia diagnosis (adjusted HR=1.32; 95% CI: 1.10 to 1.57), equivalent to a risk increase of 8.9 percentage points (95% CI: 8.5 to 9.4) at 12 months. The effect was greater for clients who reported polysubstance use (adjusted HR=1.51; 95% CI: 1.21 to 1.89). The strength of the effect of chemsex on STI incidence varied by age, education and income. CONCLUSION: Among PrEP users, chemsex at baseline was linked to increased incidence of gonorrhoea and chlamydia. This effect was stronger for people reporting multiple chemsex substances. The high STI incidence among gbMSM who report chemsex highlights the importance of PrEP for this population and the need for integrated services that address the complexities of sexualised substance use.

α,ß-Dicarbonyl reduction is mediated by the Saccharomyces Old Yellow Enzyme.

The undesirable flavor compounds diacetyl and 2,3-pentanedione are vicinal diketones (VDKs) formed by extracellular oxidative decarboxylation of intermediate metabolites of the isoleucine, leucine and valine (ILV) biosynthetic pathway. These VDKs are taken up by Saccharomyces and enzymatically converted to acetoin and 3-hydroxy-2-pentanone, respectively. Purification of a highly enriched diacetyl reductase fraction from Saccharomyces cerevisiae in conjunction with mass spectrometry identified Old Yellow Enzyme (Oye) as an enzyme capable of catalyzing VDK reduction. Kinetic analysis of recombinant Oye1p, Oye2p and Oye3p isoforms confirmed that all three isoforms reduced diacetyl and 2,3-pentanedione in an NADPH-dependent reaction. Transcriptomic analysis of S. cerevisiae (ale) and S. pastorianus (lager) yeast during industrial fermentations showed that the transcripts for OYE1, OYE2, arabinose dehydrogenase (ARA1), α-acetolactate synthase (ILV2) and α-acetohydroxyacid reductoisomerase (ILV5) were differentially regulated in a manner that correlated with changes in extracellular levels of VDKs. These studies provide insights into the mechanism for reducing VDKs and decreasing maturation times of beer which are of commercial importance.