Graft-versus-leukaemia immunity is retained following treatment with post-transplant cyclophosphamide alone or combined with tocilizumab in humanised mice.

Objectives: Donor haematopoietic stem cell transplantation treats leukaemia by inducing graft-versus-leukaemia (GVL) immunity. However, this benefit is often mitigated by graft-versus-host disease (GVHD), which is reduced by post-transplant cyclophosphamide (PTCy) alone or combined with tocilizumab (TOC) in humanised mice. This study established a preclinical humanised mouse model of GVL and investigated whether PTCy alone or combined with TOC impacts GVL immunity. Methods: NOD-scid-IL2Rγnull mice were injected with 2 × 107 human peripheral blood mononuclear cells (hPBMCs) on day 0 and with 1 × 106 THP-1 acute myeloid leukaemia cells on day 14. In subsequent experiments, mice were also injected with PTCy (33 mg kg-1) or Dulbecco's phosphate buffered saline (PBS) on days 3 and 4, alone or combined with TOC or control antibody (25 mg kg-1) twice weekly for 28 days. Clinical signs of disease were monitored until day 42. Results: Mice with hPBMCs from three different donors and THP-1 cells showed similar survival, clinical score and weight loss. hCD33+ leukaemia cells were minimal in mice reconstituted with hPBMCs from two donors but present in mice with hPBMCs from a third donor, suggesting donor-specific GVL responses. hPBMC-injected mice treated with PTCy alone or combined with TOC (PTCy + TOC) demonstrated prolonged survival compared to control mice. PTCy alone and PTCy + TOC-treated mice with hPBMCs showed minimal hepatic hCD33+ leukaemia cells, indicating sustained GVL immunity. Further, the combination of PTCy + TOC reduced histological damage in the lung and liver. Conclusion: Collectively, this research demonstrates that PTCy alone or combined with TOC impairs GVHD without compromising GVL immunity.

Healthy ageing in remote Cape York: a co-designed Integrated Allied Health Service Model.

Allied health services in rural and remote hospitals often work in siloed and solo discipline-specific positions. They are often part of general multi-disciplinary teams without a clearly articulated service model that integrates care for individuals and addresses broader community health needs. Integrated care service models for clients with complex disabilities or chronic health needs have demonstrated improved outcomes, but feasible service models are rarely described in the context of rural, remote and Aboriginal and Torres Strait Islander communities. Integration can support primary health care in remote communities where resources are thin, and the breadth of multidisciplinary service providers is not available. A remote health service, in collaboration with a University Department of Rural Health and community partners, developed a community rehabilitation and lifestyle service for adults who experience chronic disease, disability or were at risk of functional decline due to frailty. Using an integrated approach, this model of care improves access to specialist and primary healthcare services, delivers targeted group-based rehabilitation and preventative activities, and addresses community and workforce capacity to meet the needs of the remote community. This paper describes a remote primary health care, Integrated Allied Health Service Model, developed with a focus on the co-ordination and integration of care and resources between the health service, education and community.

A good life for people living with disability: the story from Far North Queensland.

PURPOSE: People with disability in regional, rural and remote Australia have poorer service access compared to people from metropolitan areas. There is urgent need for reform. This study's aim was to explore the needs and aspirations of people with lived experience of disability in Far North Queensland (FNQ) to inform a new service framework. MATERIALS AND METHODS: Twenty-five individuals with diverse experience of disability were engaged in semi-structured interviews. Participants were recruited from four sites that differed geographically, culturally, and socioeconomically. Using an inductive then deductive thematic approach to data analysis, statements of needs and aspirations were compiled and aligned with three pre-determined vision statements. RESULTS: Needs and aspirations aligned well with the vision statements which were to: feel "included, connected, safe and supported"; have "opportunities to choose one's own life and follow one's hopes and dreams"; and have "access to culturally safe services close to home." To realise this vision in FNQ, support to navigate and coordinate services across sectors is essential. CONCLUSION: People of FNQ of all abilities, need and aspire to experience "a good life" like their fellow Australians. Any new service model must focus on providing service navigation and co-ordination amid the complexities of service delivery in FNQ.Implications for RehabilitationThe perspective of people with lived experience of disability needs to be heard and respected when designing services to support them.Service navigation and co-ordination are required to manage the complexity of service delivery for people living in regional, rural and remote Australia.Engaging with the whole the community is prudent when designing community disability, rehabilitation, and lifestyle services in regional, rural, and remote Australia.

Co-creation of a student-implemented allied health service in a First Nations remote community of East Arnhem Land, Australia.

OBJECTIVES: To co-create a culturally responsive student-implemented allied health service in a First Nations remote community and to determine the feasibility and acceptability of the service. DESIGN: Co-creation involved a pragmatic iterative process, based on participatory action research approaches. Feasibility and acceptability were determined using a mixed-method pre/postdesign. SETTING: The service was in Nhulunbuy, Yirrkala and surrounding remote First Nations communities of East Arnhem Land, Northern Territory, Australia. PARTICIPANTS: Co-creation of the service was facilitated by the Northern Australia Research Network, guided by Indigenous Allied Health Australia leadership, with East Arnhem local community organisations and community members. Co-creation of the day-to-day service model involved local cultural consultants, service users and their families, staff of community organisations, students, supervisors, placement coordinators and a site administrator. FINDINGS: A reciprocal learning service model was co-created in which culturally responsive practice was embedded. The service was feasible and acceptable: it was delivered as intended; resources were adequate; the service management system was workable; and the service was acceptable. Health outcome measures, however, were not appropriate to demonstrate impact, particularly through the lens of the people of East Arnhem. Recommendations for the service included: continuing the reciprocal learning service model in the long term; expanding to include all age groups; and connecting with visiting and community-based services. CONCLUSION: The co-created service was feasible and acceptable. To demonstrate the impact of the service, measures of health service impact that are important to First Nations people living in remote communities of northern Australia are required.

Humanized Mouse Model to Study the P2X7 Receptor in Graft-Versus-Host Disease.

Humanized mouse models of graft-versus-host disease (GVHD), where human immune cells are injected into immune deficient mice, are well established and provide opportunities to investigate pathways involved in GVHD development. This chapter provides an overview of human immune cell isolation, injection of these cells into immune deficient mice, monitoring of mice for signs of GVHD, and assessment of human cell engraftment using flow cytometry. Further, this chapter focuses on the P2X7 signaling pathway involved in GVHD, and describes a strategy to block the P2X7 receptor and examine the effect of this on GVHD development.

A systematic review of disability, rehabilitation and lifestyle services in rural and remote Australia through the lens of the people-centred health care.

PURPOSE: The aim of this systematic review was to identify models of community disability, rehabilitation and lifestyle service delivery in non-metropolitan areas of Australia, and to describe these models through an Integrated People-Centred Health Services (IPCHS) lens. MATERIALS AND METHODS: We identified peer-reviewed studies published between 2000 and June 2021 that met the following criteria: described or evaluated a community service delivery model, intervention or program in regional, rural or remote Australia; provided for people with a disability or a potentially disabling health condition. A scoring rubric was developed covering the five IPCHS strategies. RESULTS: Nineteen studies were included in the review. We identified a range of service delivery models providing support to people with a range of disabilities or conditions. We report evidence of the use of the IPCHS strategies in ways relevant to the local context. DISCUSSION: Several strengths emerged, with many services tailored to individual need, and significant community engagement. Innovative rural service delivery approaches were also identified. Key areas requiring action included improved coordination or integration within and across professions and sectors. There was limited evidence of co-production of solutions or participatory governance. While people-centred approaches show promise to improve community-based services, large-scale fundamental change is required.IMPLICATIONS FOR REHABILITATIONCommunity-based disability and rehabilitation services in rural and remote Australia performed well at delivering tailored care and engaging in community consultation.These services must urgently implement strategies to enhance community ownership of solutions and participatory governance.Services must place a greater focus on explicit strategies to integrate and coordinate across services and professions, and to create an enabling environment, to deliver people-centred care.The World Health Organisation Integrated People-Centred Health Services framework provides an important roadmap to improving service delivery in rural and remote Australian communities.

Marŋgithirri guŋga'yunarawu ga guŋga'yunyarawu marŋgithinyarawu Learning to connect and connecting to learn: Preparing the rural and remote allied health workforce through a co-created student-implemented service in East Arnhem, Australia.

OBJECTIVES: To explore the process of learning for allied health students providing a student-implemented service for older Yolŋu in remote East Arnhem, Northern Territory, Australia. DESIGN: An exploratory qualitative study following an 8-week student-implemented service. SETTING: Nhulunbuy and Yirrkala and surrounding remote Aboriginal communities of the East Arnhem Region of the Northern Territory. PARTICIPANTS: Data were collected from: 4 students who implemented the service; 4 professional supervisors, 3 placement coordinators, a Yolŋu cultural consultant and a care manager from a local community organisation, all of whom supported implementation of the service; and 7 older Yolŋu and their families who were recipients of the service. INTERVENTIONS: A student-implemented service for older Yolŋu delivered by allied health students from James Cook University. Clinical, cultural and pastoral supervision and support was provided by Flinders University, James Cook University, Indigenous Allied Health Australia and 2 Yolŋu cultural consultants and 2 local community organisations. MAIN OUTCOME MEASURES: Semi-structured interviews with those who implemented, supported and received the service. Data were analysed thematically using an inductive approach. RESULTS: 'Learning to connect and connecting to learn' described how allied health students were learning to provide a service for older Yolŋu. Four interrelated processes connected their learning: 'preparing and supporting', 'bonding and responding', 'growing and enriching' and 'working and weaving'. CONCLUSION: The co-created student-implemented service provided a unique learning opportunity for allied health students on how to provide a culturally safe service in a remote Aboriginal community in northern Australia.

Purinergic Signalling in Allogeneic Haematopoietic Stem Cell Transplantation and Graft-versus-Host Disease.

Allogeneic haematopoietic stem cell transplantation (allo-HSCT) is a curative therapy for blood cancers and other haematological disorders. However, allo-HSCT leads to graft-versus-host disease (GVHD), a severe and often lethal immunological response, in the majority of transplant recipients. Current therapies for GVHD are limited and often reduce the effectiveness of allo-HSCT. Therefore, pro- and anti-inflammatory factors contributing to disease need to be explored in order to identify new treatment targets. Purinergic signalling plays important roles in haematopoiesis, inflammation and immunity, and recent evidence suggests that it can also affect haematopoietic stem cell transplantation and GVHD development. This review provides a detailed assessment of the emerging roles of purinergic receptors, most notably P2X7, P2Y2 and A2A receptors, and ectoenzymes, CD39 and CD73, in GVHD.

Evaluation of the Allied Health Rural Generalist Program 2017-2019.

OBJECTIVE: To evaluate the development and implementation of the Allied Health Rural Generalist Program, a two-level online post-graduate education program, which includes Level 1, an entry-level non-award pathway program, and Level 2, a Graduate Diploma in Rural Generalist Practice. DESIGN: A convergent mixed methodology evaluation in two overlapping stages: a process evaluation on quality and reach, together with a mixed method case study evaluation on benefits, of the program. SETTING: Rural and remote Australia across ten sites and seven allied health professions: dietetics; occupational therapy; pharmacy; physiotherapy; podiatry; radiography; speech pathology. PARTICIPANTS: Process evaluation included 91 participants enrolled in all or part of the Rural Generalist Program. Case study evaluation included 50 managers, supervisors and Rural Generalist Program participants from the ten study sites. INTERVENTIONS: The Allied Health Rural Generalist Program. MAIN OUTCOME MEASURES: Process evaluation data were derived from enrolment data and education evaluation online surveys. Case study data were gathered via online surveys and semi-structured interviews. Quantitative and qualitative data were collected concurrently, analysed separately and then integrated to identify consistency, expansion or discordance across the data. RESULTS: The Rural Generalist Program was viewed as an effective education program that provided benefits for Rural Generalist Program participants, employing organisations and consumers. Key improvements recommended included increasing profession-specific and context-specific content, ensuring Rural Generalist Program alignment with clinical and project requirements, strengthening support mechanisms within employing organisations and ensuring benefits can be sustained in the long term. CONCLUSION: The Rural Generalist Program offers a promising strategy for building a fit-for-purpose rural and remote allied health workforce.

Post-transplant cyclophosphamide limits reactive donor T cells and delays the development of graft-versus-host disease in a humanized mouse model.

Graft-versus-host disease (GVHD) is a major complication of allogeneic haematopoietic stem cell transplantation (allo-HSCT) that develops when donor T cells in the graft become reactive against the host. Post-transplant cyclophosphamide (PTCy) is increasingly used in mismatched allo-HSCT, but how PTCy impacts donor T cells and reduces GVHD is unclear. This study aimed to determine the effect of PTCy on reactive human donor T cells and GVHD development in a preclinical humanized mouse model. Immunodeficient NOD-scid-IL2Rγnull mice were injected intraperitoneally (i.p.) with 20 × 106 human peripheral blood mononuclear cells stained with carboxyfluorescein succinimidyl ester (CFSE) (day 0). Mice were subsequently injected (i.p.) with PTCy (33 mg kg-1 ) (PTCy-mice) or saline (saline-mice) (days 3 and 4). Mice were assessed for T-cell depletion on day 6 and monitored for GVHD for up to 10 weeks. Flow cytometric analysis of livers at day 6 revealed lower proportions of reactive (CFSElow ) human (h) CD3+ T cells in PTCy-mice compared with saline-mice. Over 10 weeks, PTCy-mice showed reduced weight loss and clinical GVHD, with prolonged survival and reduced histological liver GVHD compared with saline-mice. PTCy-mice also demonstrated increased splenic hCD4+ :hCD8+ T-cell ratios and reduced splenic Tregs (hCD4+  hCD25+  hCD127lo ) compared with saline-mice. This study demonstrates that PTCy reduces GVHD in a preclinical humanized mouse model. This corresponded to depletion of reactive human donor T cells, but fewer human Tregs.

Prenatal methadone exposure impairs adolescent cognition and GABAergic neurodevelopment in a novel rat model of maternal methadone treatment.

Methadone maintenance treatment (MMT) is the most common treatment for opioid-dependent pregnant women worldwide. Despite its widespread use, MMT is associated with a variety of adverse neurodevelopmental outcomes in exposed offspring, particularly cognitive impairments. The neurobiological abnormalities underlying these cognitive impairments are, however, poorly understood. This is, in part, due to a lack of animal models that represents the standard of care that methadone is administered in the clinic, with inconsistencies in the timing, doses and durations of treatment. Here we describe the characterisation of a clinically relevant rat model of MMT in which the long-term behavioural and neurobiological effects of prenatal methadone exposure can be assessed in adolescent offspring. Female Sprague-Dawley rats were treated orally with an ascending methadone dosage schedule (5, 10, 15, 20, 25 and 30 mg/kg/day), self-administered in drinking water prior to conception, throughout gestation and lactation. Pregnancy success, maternal gestational weight gain, litter survival and size were not significantly altered in methadone-exposed animals. Methadone-exposed offspring body and brain weights were significantly lower at birth. Novel object recognition tests performed at adolescence revealed methadone-exposed offspring had impaired recognition memory. Furthermore, the rewarded T-maze alternation task demonstrated that methadone-exposed female, but not male, offspring also exhibit working memory and learning deficits. Immunoblots of the adolescent prefrontal cortex and hippocampus showed methadone-exposed offspring displayed reduced levels of mature BDNF, in addition to the GABAergic proteins, GAD67 and parvalbumin, in a sex- and brain region-specific fashion. This rat model closely emulates the clinical scenario in which methadone is administered to opioid-dependent pregnant woman and provides evidence MMT can cause cognitive impairments in adolescent offspring that may be underlined by perturbed neurodevelopment of the GABAergic system.

Indigenous traumatic brain injury research: responding to recruitment challenges in the hospital environment.

BACKGROUND: Hospitals are common recruitment sites for injury and disability studies. However, the clinical and rehabilitation environment can create unique challenges for researchers to recruit participant populations. While there is growing injury and disability focused research involving Indigenous people to understand the types of services and supports required by this population to enhance their recovery experiences, there is limited knowledge of researchers' experiences implementing recruitment processes in the tertiary hospital environment. This paper reflects on the specific challenges of recruiting Indigenous patients following a traumatic brain injury from two tertiary hospitals in Northern Australia. METHODS: Between July 2016 and April 2018, research staff recruited eligible patients from one hospital in Queensland and one hospital in the Northern Territory. Qualitative records summarising research staff contact with patients, family members and clinical hospital staff were documented. These qualitative records, in addition to field trip notes and researcher reflections were reviewed to summarise the main challenges in gaining access to patients who fit the eligibility criteria. RESULTS: During the recruitment process, there were five main challenges encountered: (1) Patients discharging against medical advice from hospital; (2) Discharge prior to formal emergence from Post Traumatic Amnesia as per the Westmead Post Trauma Amnesia Scale; (3) Patients under adult guardianship orders; (4) Narrow participant eligibility criteria and (5) Coordinating around patient commitments and treatment. Details of how the recruitment processes were modified throughout the recruitment phase of the study to ensure greater access to patients that met the criteria are described. CONCLUSION: Based on our recruitment experiences, several recommendations are proposed for future TBI studies with Indigenous Australians. In addition to treatment, Indigenous TBI patients have wide range of needs that must be addressed while in hospital. Patient engagement and data collection processes should be flexible to respond to patient needs and the hospital environment. Employment of a centralized recruiter at each hospital site may help to minimise the challenges researchers need to navigate in the hospital environment. To improve recruitment processes in hospitals, it is essential for researchers examining other health or injury outcomes to describe their recruitment experiences.

Alcohol management plans in Aboriginal and Torres Strait Islander (Indigenous) Australian communities in Queensland: community residents have experienced favourable impacts but also suffered unfavourable ones.

BACKGROUND: In Australia, 'Alcohol Management Plans' (AMPs) provide the policy infrastructure for State and Commonwealth Governments to address problematic alcohol use among Aboriginal and Torres Strait Islanders. We report community residents' experiences of AMPs in 10 of Queensland's 15 remote Indigenous communities. METHODS: This cross-sectional study used a two-stage sampling strategy: N = 1211; 588 (48%) males, 623 (52%) females aged ≥18 years in 10 communities. Seven propositions about 'favourable' impacts and seven about 'unfavourable' impacts were developed from semi-structured interviews. For each proposition, one-sample tests of proportions examined participant agreement and multivariable binary logistic regressions assessed influences of gender, age (18-24, 25-44, 45-64, ≥65 years), residence (≥6 years), current drinking and Indigenous status. Confirmatory factor analyses estimated scale reliability (ρ), item loadings and covariances. RESULTS: Slim majorities agreed that: AMPs reduced violence (53%, p = 0.024); community a better place to live (54%, 0.012); and children were safer (56%, p < 0.001). More agreed that: school attendance improved (66%, p < 0.001); and awareness of alcohol's harms increased (71%, p < 0.001). Participants were equivocal about improved personal safety (53%, p = 0.097) and reduced violence against women (49%, p = 0.362). The seven 'favourable' items reliably summarized participants' experiences of reduced violence and improved community amenity (ρ = 0.90). Stronger agreement was found for six 'unfavourable' items: alcohol availability not reduced (58%, p < 0.001); drinking not reduced (56%, p < 0.001)); cannabis use increased (69%, p < 0.001); more binge drinking (73%, p < 0.001); discrimination experienced (77%, p < 0.001); increased fines, convictions and criminal records for breaching restrictions (90%, p < 0.001). Participants were equivocal (51% agreed, p = 0.365) that police could enforce restrictions effectively. 'Unfavourable' items were not reliably reflected in one group (ρ = 0.48) but in: i) alcohol availability and consumption not reduced and ii) criminalization and discrimination. In logistic regressions, longer-term (≥ 6 years) residents more likely agreed that violence against women had reduced and that personal safety had improved but also that criminalization and binge drinking had increased. Younger people disagreed that their community was a better place to live and strongly agreed about discrimination. Current drinkers' views differed little from the sample overall. CONCLUSIONS: The present Government review provides an opportunity to reinforce 'favourable' outcomes while targeting: illicit alcohol, treatment and diversion services and reconciliation of criminalization and discrimination issues.

Alcohol control policies in Indigenous communities: A qualitative study of the perceptions of their effectiveness among service providers, stakeholders and community leaders in Queensland (Australia).

BACKGROUND: Favourable impacts are reported from complex alcohol control strategies, known as 'Alcohol Management Plans' (AMPs) implemented 14 years ago in 19 Aboriginal and Torres Strait Islander (Indigenous) communities in Queensland (Australia). However, it is not clear that all communities benefited and that positive impacts were sustained. Service providers, key stakeholders and community leaders provided insights about issues and impacts. METHODS: Participants (N=382) were recruited from knowledgeable and experienced persons using agency lists and by recommendation across sectors which have a mandate for managing alcohol-related issues and consequences of AMP policies in communities. In semi-structured interviews, participants (51% Indigenous, 55% male and comprised of at least one-third local community residents) were asked whether they believed alcohol controls had been effective and to describe any favourable and unfavourable outcomes experienced or perceived. Inductive techniques were used for thematic analysis of the content of transcribed recorded interviews. Comments reflecting themes were assessed across service sectors, by gender, Indigenous status and remoteness. RESULTS: Participants attributed reduced violence and improved community amenity to AMPs, particularly for 'very remote' communities. Participants' information suggests that these important achievements happened abruptly but may have become undermined over time by: the availability of illicit alcohol and an urgency to consume it; migration to larger centres to seek alcohol; criminalization; substitution of illicit drugs for alcohol; changed drinking behaviours and discrimination. Most issues were more frequently linked with 'very remote' communities. CONCLUSION: Alcohol restrictions in Queensland's Indigenous communities may have brought favourable changes, a significant achievement after a long period of poorly regulated alcohol availability from the 1980s up to 2002. Subsequently, over the past decade, an urgency to access and consume illicit alcohol appears to have emerged. It is not clear that relaxing restrictions would reverse the harmful impacts of AMPs without significant demand reduction, treatment and diversion efforts.

Alcohol management plans in Indigenous communities in Queensland (Australia) may have unintended implications for the care of children.

BACKGROUND: Indigenous children in Australia are more likely than non-Indigenous children to be in contact with the child safety system. A large number of Queensland's Indigenous population live in remote and isolated communities in north Queensland where the state government's Alcohol Management Plans (AMPs) are in effect. In these communities it is an offence to have in one's possession more than the regulated amount and type of alcohol. A breach of these restrictions can result in convictions under the Liquor Act 1992. FINDINGS: During an evaluation of AMPs, influential stakeholders and key service providers voiced their belief that a conviction for a breach of the AMP would impact a person's eligibility to hold a Positive Notice Blue Card (PNBC). On its own, however, a breach of the Liquor Act 1992 will not impact a person's eligibility for a PNBC. A PNBC is required for any person volunteering or working with children. Without a PNBC, a person is ineligible to work in child-related employment, volunteer at child-related activities or provide out-of-home care for children. CONCLUSION: This misconception needs to be addressed in these already-disadvantaged communities to ensure that Indigenous community members have every opportunity to hold a PNBC. Focused strategies with evaluation and research are needed in this important policy area.

The implementation and development of complex alcohol control policies in indigenous communities in Queensland (Australia).

Very high rates of injury and death during the 1990s were linked with increased alcohol availability and misuse in discrete Indigenous communities in rural and remote Queensland (Australia). To address widespread concerns about a public health crisis, from 2002, the Queensland Government implemented alcohol control strategies known as 'Alcohol Management Plans' (AMPs) in 19 of these communities. Although resources for prevention and treatment were promised, AMPs became increasingly focused on local prohibition, restricted access to alcohol and punitive measures for breaching restrictions. An examination of legislation, regulations, explanatory notes, and published documents indicates this focus evolved across four phases since 2002. The first phase, from 2002 to 2004, saw 'restricted areas' with alcohol 'carriage limits' introduced, restricting the amounts and types of liquor permitted within some communities. The second phase (2002-2007) featured evaluations and reviews by the Queensland Government bringing recommendations for more stringent controls. Additionally, beyond the 'restricted areas', licenced premises situated within the 'catchments' of the targeted communities, mainly located in the nearby regional towns, became subject to 'minimising harm' provisions. These more stringent controls were implemented widely in the third phase (2008-2011) when: the operations of seven community-managed liquor outlets were terminated; the trading arrangements of two others were modified; Police powers to search and seize were increased; and 'attempting' to take liquor into a 'restricted area' also became an offence. Some communities have seen a reduction in alcohol-related harms that have been attributed to these alcohol control strategies. This commentary maps the recent regulatory history of Queensland's alcohol controls targeting discrete Indigenous communities highlighting their increasing focus on punitive measures to reduce access to alcohol. With AMPs in Queensland currently under Government review, and with community resolve for change rising, the limits to Government controls and punitive measures may have been reached.

A service-level action research intervention to improve identification and treatment of cannabis and related mental health issues in young Indigenous Australians: a study protocol.

INTRODUCTION: Regular cannabis use is associated with negative mental health impacts including psychosis, depression and anxiety. Rates of cannabis use have increased in Aboriginal and Torres Strait Islander communities in northern Australia within the last two decades, presenting a significant increased risk to young people's mental health in these regions. Improved screening, early detection and treatment for cannabis-related mental health issues are urgently required. This paper describes a service-level action research intervention and evaluation protocol for use in the few services where it is possible to engage young Aboriginal and Torres Strait Islander Australians. METHODS/DESIGN: The protocol is being developed in two services where youth mental health is core business: a primary healthcare centre and a youth service in the Cairns and hinterland region, far north Queensland. The protocol calls first for baseline data to be collected using staff and client surveys; network mapping; and analysis of screening, treatment and referral rates. The protocol's intervention phase is driven by service needs identified from baseline data. Intervention strategies focus on implementing/enhancing cannabis screening instruments and processes in line with current best practice; enhancing networks with external drug and mental health services; developing culturally acceptable training and resources; developing activities aiming to reduce cannabis use in young Aboriginal and Torres Strait Islander clients using the services. The protocol requires implementation of the multilevel intervention within each service for 1 year, with follow-up data then collected and compared to baseline. Process evaluation identifies the more effective intervention strategies and documents the challenges to be overcome for full implementation. ETHICS AND DISSEMINATION: Ethics approval was provided by The James Cook University, Human Research Ethics Committee. Ethics Approval Number H5322. Peer-reviewed publications will also be used to disseminate the finding. Results will also be discussed with stakeholder organisations.