Allergic contact dermatitis to nickel: modified in vitro test protocols for better detection of allergen-specific response

To date, no in vitro test is suitable for routine diagnosis of contact allergy. The aim of our study was to establish improved in vitro test protocol for the detection of antigen-specific responses of lymphocytes from patients with allergic contact dermatitis to nickel (Ni-ACD). Blood leucocytes from 14 Ni-ACD patients and 14 controls were cultured in the presence of 'cytokine cocktails' skewing lymphocytes towards 'type 1' [interferon-gamma (IFN-gamma)-secreting] or 'type 2' [interleukin (IL)-5 and IL-13-secreting] phenotypes. The cocktails consisted of IL-7 and, respectively, either IL-12 or IL-4. Cell responses to nickel were measured with enzyme-linked immunospot assay (ELISpot), enzyme-linked immunosorbent assay (ELISA), and lymphocyte proliferation test (LPT). Significant differences between patients with Ni-ACD and controls were found for the 'type 2' cytokines IL-13 and IL-5, with further increase of allergen-specific responses occurring when cultures were supplemented with IL-7 and IL-4. No significant differences were found for IFN-gamma. The best correlate to clinical diagnosis was LPT with 'type 2' skewing (r= 0.739, P < 0.001), followed by IL-13 ELISpot with 'type 2' skewing (r= 0.654, P < 0.001). The non-radioactive method that correlated best with LPT was IL-2 ELISpot (r= 0.809, P < 0.001). Overall, we conclude that combining ELISpot assay with proposed modifications of culture conditions improves detection of specific lymphocyte responses in contact allergy to nickel.     

The Algerian Chapter of SARS-CoV-2 Pandemic: An Evolutionary,Genetic, and Epidemiological Prospect

To explore the SARS-CoV-2 pandemic in Algeria, a dataset comprising ninety-five genomes originating from SARS-CoV-2 sampled from Algeria and other countries worldwide, from 24 December 2019, through 4 March 2021, was thoroughly examined. While performing a multi-component analysis regarding the Algerian outbreak, the toolkit of phylogenetic, phylogeographic, haplotype, and genomic analysis were effectively implemented. We estimated the Time to the Most Recent Common Ancestor (TMRCA) in reference to the Algerian pandemic and highlighted the multiple introductions of the disease and the missing data depicted in the transmission loop. In addition, we emphasized the significant role played by local and international travels in disease dissemination. Most importantly, we unveiled mutational patterns, the effect of unique mutations on corresponding proteins, and the relatedness regarding the Algerian sequences to other sequences worldwide. Our results revealed individual amino-acid replacements such as the deleterious replacement A23T in the orf3a gene in Algeria_EPI_ISL_418241. Additionally, a connection between Algeria_EPI_ISL_420037 and sequences originating from the USA was observed through a USA characteristic amino-acid replacement T1004I in the nsp3 gene, found in the aforementioned Algerian sequence. Similarly, successful tracing could be established, such as Algeria/G37318-8849/2020|EPI_ISL_766863, which was imported from Saudi Arabia during the pilgrimage. Lastly, we assessed the Algerian mitigation measures regarding disease containment using statistical analyses.     

Redox imbalance of red blood cells impacts T lymphocyte homeostasis: implication in carotid atherosclerosis

Oxidative stress and immune/inflammatory responses are key pathogenetic factors of atherosclerotic disease. In this contest, mechanisms that regulate survival and death of immune cells may be relevant. Previous studies have demonstrated that red blood cells (RBCs) are physiologically able to inhibit apoptosis and to promote proliferation of activated T lymphocytes from healthy subjects. The aim of the present study was to evaluate whether RBCs from patients with carotid atherosclerosis maintain their property to modulate T cell homeostasis. Peripheral blood lymphocytes (PBLs) obtained from healthy subjects were activated in vitro by phytohemagglutinin in the presence/absence of RBCs from patients with carotid atherosclerosis or of in vitro oxidised RBCs from healthy subjects. Levels of reactive oxygen species (ROS) and aging markers of RBCs as well as susceptibility to apoptosis of PBLs were evaluated by flow cytometry. PBL proliferation was evaluated by 3H-methyl-thymidine incorporation assay whereas secretion of cytokines, analysed in view of their key role in T cell function, was assessed by ELISA. Levels of ROS and phosphatidyl-serine externalisation, a sign of RBC aging, resulted significantly higher in RBCs from patients than in those from healthy subjects, whereas surface glycophorin A expression and reduced glutathione content did the opposite. Unlike RBCs obtained from healthy subjects, RBCs from patients and in vitro oxidised RBCs did not protect activated T lymphocytes from apoptosis. Hence, RBCs from patients with carotid atherosclerosis, probably due to their oxidative imbalance, impact T cell integrity and function. Our results suggest a new regulatory role for RBCs in atherosclerosis.     

Demonstration of Kathon® CG in some commercial products

The preservative Kathon CG has become one of the most common sensitizers. It has, however, been difficult to explain the sensitization and to assess the clinical relevance of the contact allergy, partly due to lack of specification of the preservative in products. A high-performance liquid chromatography method was used to demonstrate Kathon CG in 123 commercial products of both "leave on" and "rinse off" types. 38 of these contained Kathon CG in the range of 1-15 ppm of active ingredients. There were no differences between "leave on" and "rinse off" products concerning the relative number of products containing Kathon CG and the concentrations of the preservative.     

ORIGINAL RESEARCH—EPIDEMIOLOGY: Correlates of Sexually Related Personal Distress in Women with Low Sexual Desire

IntroductionSexual distress is an important component of diagnostic criteria for sexual dysfunctions, but little is known about the factors associated with sexual distress in women with low sexual desire.AimTo investigate the correlates of sexual distress in women with self-reported low sexual desire.MethodsThe Prevalence of Female Sexual Problems Associated with Distress and Determinants of Treatment Seeking study was a cross-sectional, nationally representative, mailed survey of U.S. adult women. There were 31,581 respondents (response rate 63.2%) to the 42-item questionnaire that measured sexual function, sexual distress, demographic, and health-related factors. Multivariable logistic regression was used to explore the correlates of distress.Main Outcome MeasuresLow sexual desire was defined as a response of “never” or “rarely” to the question, “How often do you desire to engage in sexual activity?” Sexual distress was measured with the Female Sexual Distress Scale (range 0–48), with a score of 15 or higher indicating presence of distress.ResultsOf 10,429 women with low desire, 2,868 (27.5%) had sexual distress (mean age 48.6 years, 81% with a current partner). Women without distress were 10 years older on average, and 44% had a current partner. Having a partner was strongly related to distress (odds ratio 4.6, 95% confidence interval 4.1–5.2). Other correlates were age, race, current depression, anxiety, lower social functioning, hormonal medication use, urinary incontinence, and concurrent sexual problems (arousal or orgasm). Dissatisfaction with sex life was more common in women with low desire and distress (65%) than in those without distress (20%).ConclusionsAge has a curvilinear relationship with distress, and the strongest correlate of sexual distress was having a current partner. Sexual distress and dissatisfaction with sex life are strongly correlated. Distress is higher in women with low sexual desire in a partner relationship; further research on this factor is needed. Rosen RC, Shifren JL, Monz BU, Odom DM, Russo PA, and Johannes CB. Correlates of sexually related personal distress in women with low sexual desire. J Sex Med 2009;6:1549–1560.