Glycerol Improves Skin Lesion Development in the Imiquimod Mouse Model of Psoriasis: Experimental Confirmation of Anecdotal Reports from Patients with Psoriasis

Glycerol is used in many skin care products because it improves skin function. Anecdotal reports by patients on the National Psoriasis Foundation website also suggest that glycerol may be helpful for the treatment of psoriasis, although to date no experimental data confirm this idea. Glycerol entry into epidermal keratinocytes is facilitated by aquaglyceroporins like aquaporin-3 (AQP3), and its conversion to phosphatidylglycerol, a lipid messenger that promotes keratinocyte differentiation, requires the lipid-metabolizing enzyme phospholipase-D2 (PLD2). To evaluate whether glycerol inhibits inflammation and psoriasiform lesion development in the imiquimod (IMQ)-induced mouse model of psoriasis, glycerol’s effect on psoriasiform skin lesions was determined in IMQ-treated wild-type and PLD2 knockout mice, with glycerol provided either in drinking water or applied topically. Psoriasis area and severity index, ear thickness and ear biopsy weight, epidermal thickness, and inflammatory markers were quantified. Topical and oral glycerol ameliorated psoriasiform lesion development in wild-type mice. Topical glycerol appeared to act as an emollient to induce beneficial effects, since even in PLD2 knockout mice topical glycerol application improved skin lesions. In contrast, the beneficial effects of oral glycerol required PLD2, with no improvement in psoriasiform lesions observed in PLD2 knockout mice. Our findings suggest that the ability of oral glycerol to improve psoriasiform lesions requires its PLD2-mediated conversion to phosphatidylglycerol, consistent with our previous report that phosphatidylglycerol itself improves psoriasiform lesions in this model. Our data also support anecdotal evidence that glycerol can ameliorate psoriasis symptoms and therefore might be a useful therapy alone or in conjunction with other treatments.

Translating the 2020 AAD-NPF Guidelines of Care for the Management of Psoriasis With Systemic Nonbiologics to Clinical Practice

In 2020, the American Academy of Dermatology (AAD) and the National Psoriasis Foundation (NPF) released a set of guidelines for the management of psoriasis in adults with systemic nonbiologic therapies, including acitretin, apremilast, cyclosporine, fumaric acid esters, methotrexate, and tofacitinib. This review addresses dosing, efficacy, toxicity, drug-related interactions, and contraindications alongside evidence-based treatment recommendations for each systemic therapy. Important considerations for treatment such as drug selection, initiation of therapy, drug monitoring, and patient management also are discussed. Physicians are encouraged to use these recommendations to guide treatments based on individual patient needs and disease characteristics.

Prevalence of Utilization Management Policies Among the Psoriatic Disease Community: Results From the 2019 National Psoriasis Foundation Advocacy Survey

Introduction: Utilization management (UM) policies are becoming more common among commercial insurance policies. However, little research has been conducted to understand the prevalence of experiencing UM restrictions among patients with psoriatic disease. Objectives: To understand the prevalence of UM policies within the psoriatic patient community and examine their relationship with patient characteristics. Methods: An online survey of 1205 individuals with a psoriatic disease from the National Psoriasis Foundation’s constituent database was conducted. Data were collected from July 7 to July 31, 2019. The main outcomes of interest for the present study were frequency of experiencing UM policies (eg, prior authorization [PA] or step therapy [ST]) from their insurance company, number, and type of UM policies experienced and relationship between patient characteristics and experiencing these policies. Results: Survey respondents reported high rates of experiencing some form of UM restriction (80.5%). Nearly half (45.1%) of the survey respondents indicated their insurer required them to try a therapy other than the therapy originally prescribed by their physician, a practice known as ST or “fail first” and 73% of respondents reported having to receive PA from their insurer before initiating treatment. Conclusions: Individuals with psoriatic disease commonly encounter UM policies from their insurer when attempting to manage their disease. Statistical analyses suggest that UM policies are related to the type of treatment used by patients and the type of psoriatic disease.