Review of treatments for pseudofolliculitis barbae.

Pseudofolliculitis barbae (PFB) is a chronic inflammatory condition characterized by follicular and perifollicular papules and pustules primarily affecting the beard and neck area. PFB is a condition that predominantly affects patients with skin of colour. The objective of this paper is to review the epidemiology, pathogenesis and presentation of PFB, and assess the most recent evidence-based treatment options and recommendations for PFB. This is important to increase the quality of care given to target patient populations and to address the prominent disparity in healthcare management of patients with skin of colour. A literature review was conducted utilizing PubMed and Cochrane Library. The key term 'pseudofolliculitis barbae' was used. Search parameters were set to search from 1987 to the present. Results were further narrowed by limiting the literature review to published observational studies, case studies, case series, randomized control trials and case-control studies. Effective treatment for PFB requires a multifaceted approach that targets various aspects of the pathogenesis. Current treatments include preventive measures, antibiotics, corticosteroids, keratolytics, chemical depilatories and/or laser treatments. Topical therapies are currently the mainstay treatment. However, laser hair removal has become a potential long-term treatment option, and additional studies are warranted to understand its long-term efficacy and permanency.

Role of Citrullinated Collagen in Autoimmune Arthritis.

Citrullination of proteins plays an important role in protein function and it has recently become clear that citrullinated proteins play a role in immune responses. In this study we examined how citrullinated collagen, an extracellular matrix protein, affects T-cell function during the development of autoimmune arthritis. Using an HLA-DR1 transgenic mouse model of rheumatoid arthritis, mice were treated intraperitoneally with either native type I collagen (CI), citrullinated CI (cit-CI), or phosphate buffered saline (PBS) prior to induction of autoimmune arthritis. While the mice given native CI had significantly less severe arthritis than controls administered PBS, mice receiving cit-CI had no decrease in the severity of autoimmune arthritis. Using Jurkat cells expressing the inhibitory receptor leukocyte-associated immunoglobulin-like receptor-1 (LAIR-1), Western blot analysis indicated that while CI and cit-CI bound to LAIR-1 with similar affinity, only CI induced phosphorylation of the LAIR ITIM tyrosines; cit-CI was ineffective. These data suggest that cit-CI acts as an antagonist of LAIR-1 signaling, and that the severity of autoimmune arthritis can effectively be altered by targeting T cells with citrullinated collagen.

Inhibition of the thioesterase activity of human fatty acid synthase by 1,4- and 9,10-diones.

Fatty acid synthase (FASN) is the enzyme that synthesizes fatty acids de novo in human cells. Although FASN is generally expressed at low levels in most normal tissues, its expression is highly upregulated in many cancers. Consistent with this notion, inhibition of FASN activity has demonstrated potential to halt proliferation and induce cell death in vitro and to block tumor growth in vivo. Consequently, FASN is widely recognized as a valuable therapeutic target. In this report, we describe a variety of 1,4-quinones and 9,10-anthraquinones, including several natural compounds and some newly synthesized compounds, that potently inhibit the thioesterase (TE) domain of FASN. Inhibition of recombinant TE activity, inhibition of cellular FASN, and cytotoxicity in human prostate cancer cell lines and normal fibroblasts, is shown for the most potent inhibitors. Collectively, the data illustrate the novel inhibitory capacity of the 1,4-quinone and 9,10-anthraquinone pharmacophores against FASN.