Comparison Between Pregabalin and Sertraline for Treatment of Uraemic Pruritus in Patients on Maintenance Haemodialysis: A Single-Centric Study.

OBJECTIVE: To compare oral pregabalin with oral sertraline for treatment of uraemic pruritus. STUDY DESIGN: Randomised controlled trial. Place and Duration of the Study: Department of Nephrology, Pak Emirates Military Hospital Rawalpindi, Pakistan, from October 2023 to January 2024. METHODOLOGY: Patients with end-stage renal disease having pruritus for at least 6 weeks were included. Exclusion criteria comprised other dermatological or systemic diseases associated with pruritus, mental health issues, thrice-a-week haemodialysis schedule, and use of other treatments for uraemic pruritus. They were randomised to receive either pregabalin 75mg daily or sertraline 50mg daily for six weeks using computer-generated sequences. The Urdu version of the 5-D Itch scale was used to document the severity of pruritus at the baseline and at the end of therapy. Side effects to the treatment were also monitored. RESULTS: There were 8 (16.67%) females and 40 (83.33%) males, with a mean age of 52.19 ± 12.19 years. The baseline 5-D Itch scale scores were equal in both groups. Mean improvement in 5-D Itch scale scores was 3.75 ± 1.26 and 2.08 ± 1.18 with pregabalin and sertraline, respectively (p <0.001). Side effects were reported by 2 (8.33%) patients on pregabalin and none using sertraline (p = 0.489). CONCLUSION: Pregabalin was found to be more effective than sertraline in treating uraemic pruritus, though with a statistically insignificant trend towards a higher frequency of side effects. KEY WORDS: Chronic renal failure, Pruritus, Renal dialysis, Selective serotonin reuptake inhibitors, Uraemia.

Effect of Omega-3 Polyunsaturated Fatty Acid Supplementation on Clinical Outcome of Atopic Dermatitis in Children.

The use of omega-3 fatty acids (omega-3 FA) in the treatment of atopic dermatitis (AD) is an area of ongoing research. Some studies suggest that dietary supplementation with omega-3 FA can help manage symptoms of AD by reducing lesion severity, skin inflammation, dryness and itching, while others show no significant beneficial effect. The aim of this study was to evaluate the effect of omega-3 FA from fish oil in combination with gamma-linolenic acid (GLA) from blackcurrant seed oil in children with AD. This is a longitudinal, prospective, randomized, triple blind, placebo-controlled parallel clinical trial. The study was conducted during the 2-year period throughout autumn, winter, and spring, avoiding the summer when AD usually improves. Children were randomized to receive the active study product (Mega Kid®) containing a specific blend of omega-3 and omega-6 fatty acids or placebo. The primary outcomes were changes in severity of AD measured using SCORing Atopic Dermatitis (SCORAD), patient-oriented SCORAD (PO-SCORAD) and the difference in topical corticosteroid (TCS) use. The secondary outcomes were changes in itch intensity, sleep quality and Family Dermatology Life Quality Index (FDLQI). Data were analyzed for 52 children (26 in the intervention group and 26 in the placebo group). In children receiving the active product, intention-to-treat analysis showed that after 4 months of treatment, there was a significant decrease in the SCORAD index (from median 42 to 25, p < 0.001) and the use of topical corticosteroids (from median 30 to 10 mg/month, p < 0.001), but also significant improvements in itch, sleep quality, and overall quality of life. Omega-3 fatty acids in combination with GLA and vitamin D may decrease symptoms and were associated with an improvement clinical picture of AD in children. Therefore, we can conclude that supplementation with this specific combination could be considered a safe and effective intervention that may significantly reduce the severity of AD in pediatric patients.

Possibility of maintaining remission with topical therapy alone after withdrawal of dupilumab in Japanese patients with atopic dermatitis and their characteristics in the real world.

Psossibility and appropriate timing of discontinuation of dupilumab for atopic dermatitis (AD) remain unclear. We explored the possibility of patients, who could maintain remission with topical therapy alone after withdrawing dupilumab in the real world. Furthermore, we identified their characteristics. All adult AD patients who initiated dupilumab from June 2018 to July 2022 and were treated with dupilumab for more than 3 months at our hospital were included in this study. The observation period was from June 2018 to July 2023. In 138 patients, 58 (42.0%) discontinued dupilumab at least once. Among them, 18 (13.0%) discontinued dupilumab but reinitiated dupilumab later due to exacerbation. Only seven patients (5.1%) could maintain remission with topical therapy alone after discontinuation of dupilumab, with characteristics of lower POEM, VAS of pruritus, serum levels of TARC and LDH, and neutrophil counts at baseline, and those of longer duration of dupilumab until its discontinuation (24.0 ± 13.3 vs. 12.8 ± 7.3 months) and lower EASI and affected BSA at the discontinuation of dupilumab. In 118 patients treated with dupilumab for at least 1 year, 38 patients (32.2%) discontinued at least once. Only four patients (3.4%) could maintain remission with topical therapy alone after discontinuation of dupilumab, with characteristics of lower POEM at baseline and lower EASI at the discontinuation of dupilumab. In conclusion, maintaining remission after withdrawing dupilumab is challenging. Discontinuation of dupilumab may be considered in patients with low baseline POEM, after more than 2 years of dupilumab treatment, with a substantial decrease in EASI.

Adjunctive Management of Itch in Atopic Dermatitis.

Atopic dermatitis (AD) is a chronic inflammatory skin condition that can be difficult to treat due to a complex etiology and diverse clinical presentations. Itch is the most common symptom associated with AD with profound negative impact on quality of life. Thus, the adjunctive management of itch in patients with AD is needed to control and reduce disease burden. Supplemental treatment options are continuously emerging and undergoing testing in clinical trials. This article summarizes the latest data on topical and systemic adjunctive therapies for AD safety and efficacy in reducing itch.

TRPV4-ß-catenin axis is a novel therapeutic target for dry skin-induced chronic itch.

Dry skin induced chronic pruritus is an increasingly common and debilitating problem, especially in the elderly. Although keratinocytes play important roles in innate and adaptive immunity and keratinocyte proliferation is a key feature of dry skin induced chronic pruritus, the exact contribution of keratinocytes to the pathogenesis of dry skin induced chronic pruritus is poorly understood. In this study, we generated the acetone-ether-water induced dry skin model in mice and found that epidermal hyperplasia induced by this model is partly dependent on the ß-catenin signaling pathway. XAV939, an antagonist of ß-catenin signaling pathway, inhibited epidermal hyperplasia in dry skin model mice. Importantly, dry skin induced chronic pruritus also dramatically reduced in XAV939 treated mice. Moreover, acetone-ether-water treatment-induced epidermal hyperplasia and chronic itch were decreased in Trpv4-/- mice. In vitro, XAV939 inhibited hypo-osmotic stress induced proliferation of HaCaT cells, and hypo-osmotic stress induced proliferation of in HaCaT cells and primary cultured keratinocytes were also significantly reduced by blocking TRPV4 function. Finally, thymic stromal lymphopoietin release was examined both in vivo and in vitro, which was significantly inhibited by XAV939 treatment and Trpv4 deficiency, and anti-TSLP antibody treatment significantly decreased AEW-induced scratching behavior. Overall, our study revealed a unique ability of TRPV4 expressing keratinocytes in the skin, which critically mediated dry skin induced epidermal hyperplasia and chronic pruritus, thus provided novel insights into the development of therapies for chronic pruritus in the elderly.

Notalgia Paresthetica Dermatologist Report of Symptom Burden and Treatment: Results from a Physician Survey.

Notalgia paresthetica (NP) is a sensory neuropathy characterized by chronic pruritus, skin pain, and other pathologic sensations affecting the mid-to-upper back. NP may be under-recognized and under-diagnosed, with limited data available on its symptom presentation and treatment patterns. NP-DERM was an internet-based survey of dermatologists (n = 650) from 8 different countries on their perspectives on NP symptoms and current treatment practices. Dermatologists typically treated a median of 12 patients with NP per month. Dermatologists reported that itch (pruritus) was the most common symptom for their patients with NP, followed by hyperpigmentation and sensitive skin. The most burdensome NP symptom was pruritus, followed by burning or hot sensation, and painful or raw skin. The most prescribed treatments included non-medicated skin care, topical corticosteroids, oral antihistamines, medicated topicals, and gabapentin or pregabalin. Physicians reported low satisfaction with available treatments. The most common reason for physicians to discontinue patients' therapy was lack of response.

Clinical observation of topical antipruritic spray acting on epidermal growth factor receptor tyrosine kinase inhibitor in the treatment of dermatitis.

To observe the efficacy of topical antipruritic spray (TAS) in the treatment of epidermal growth factor receptor (EGFR) tyrosine kinase-related rashes, and to evaluate its efficacy and safety. 120 malignant tumor patients with confirmed pathological diagnosis and rash after EGFR application were selected and randomly divided into an experimental group of 60 cases and a control group of 60 cases. The 2 groups were intervened with self-made antipruritic spray and erythromycin ointment for 14 consecutive days. To observe the changes in rash, itching degree, and quality of life index of skin diseases in both groups of patients before and after treatment. The decrease in the number of itching cases in the experimental group reached 53.84%, and after 7 weeks of intervention, the total effective rate of rash treatment in this group of patients (91.67%) was significantly better than that in the control group (36.67%); The symptoms of the dermatology life quality index (DLQI) scale in the experimental group patient table after intervention showed significant changes compared to before intervention. After statistical testing, there was a significant difference between the groups and outside the group (R < 0.05). And the comprehensive effect of the experimental patients with external spray after 14 weeks of intervention reached 93.16%. The self-made antipruritic spray has significant effect on improving EGFR rash and itching, and there is no obvious adverse reaction.

Case report: Dupilumab: a promising treatment option for adult linear IgA bullous dermatosis with severe pruritus.

Linear IgA bullous dermatosis (LABD) is an acquired autoimmune subepidermal blistering disorder. Diagnosis always relies on skin pathology and direct immunofluorescence (DIF), with typical linear deposits of IgA along the basement membrane zone (BMZ). The typical clinical manifestation is tense bullae arranged like the "string of pearls" companied with severe pruritus. Dapsone is often considered first-line therapy for LABD, and it is necessary to test the HLA-B*1301 gene to prevent the occurrence of dapsone-induced hypersensitivity syndrome (DHS). Here we report a case of LABD resistant to corticosteroid and sulfasalazine, while waiting for HLA-B*1301 gene test results, dupilumab was used to control severe pruritus.

The efficacy and safety of difelikefalin for pruritus in hemodialysis patients: a systematic review and meta-analysis of randomized controlled trials.

BACKGROUND: Chronic kidney disease-associated pruritus (CKD-ap) is a common complication that negatively affects the quality of life. Difelikefalin has emerged as a novel FDA-approved drug to manage CKD-ap. This systematic review and meta-analysis will assess the efficacy and safety of Difelikefalin versus placebo to manage CKD-ap. METHODS: PubMed, Scopus, WOS, Central, and Embase were systematically searched until November 2023. RevMan was used to perform meta-analysis. Quality assessment was conducted using the Cochrane RoB 2.0 tool. Results were reported as risk ratio (RR) and mean difference (MD) with a 95% confidence interval (CI). PROSPERO ID: (CRD42023485979). RESULTS: Five RCTs with a total of 896 participants were included. Difelikefalin significantly decreased the weekly mean WI-NRS score (MD: -0.99 [-1.22, -0.75], p ˂ .00001), 5-D itch scale total score (MD: -1.51 [-2.26, -0.76], p > .0001), and Skindex-10 total score (MD: -7.39 [-12.51, -2.28], p = .005), but showed significantly higher adverse events (RR: 1.26 [1.03, 1.55], p = .03), versus placebo. However, there was no significant difference between both groups in serious adverse events (RR: 1.42 [0.78, 2.57], p = .25) or death (RR: 0.81 [0.19, 3.34], p = .77). CONCLUSION: Difelikefalin appears to be a promising agent for the management of CKD-induced pruritus in patients with end-stage renal disease. However, evidence is still underpowered due to the paucity of the current data; therefore, more robust RCTs are required to confirm the benefit of Difelikefalin.

Clinical Evaluation of the Efficacy of Itch-Relief Moisturizers Containing Maltotetraose for Dry, Itchy, and Sensitive Skin.

Itching is a prominent clinical manifestation of sensitive skin; it reduces cutaneous barrier function, mainly caused by dryness. Scratching to relieve itching destroys the skin barrier, thus forming the itch-scratch cycle that results in additional disruption of skin barrier and chronic itching. Treatment involves alleviation from itching for sensitive skin. Recently, substance P (11-amino acid neuropeptide of the tachykinin family) and neurokinin 1 receptor (NK1R) have been considered to provide a key pathway to treat chronic itching. A single-center, open-label study was conducted comprising subjects with dry, itchy, and sensitive skin to evaluate the efficacy of two types of itch-relief moisturizers, mist and lotion, containing maltotetraose (MTO). In all, 35 subjects used mist containing MTO, resulting in significant improvement in itch score from 1 minute to 2 hours following single application. On the other hand, 34 subjects applied lotion containing MTO for 1 week, resulting in significant improvement in itch score, skin hydration, and clinical scores of erythema/redness and dryness; however, in both cases, improve-ment was not observed in the measurement of transepidermal water loss (TEWL). It was concluded that two types of itch-relief moisturizers containing MTO were effective for dry, itchy, and sensitive skin.

Evaluating the safety and efficacy of seladelpar for adults with primary biliary cholangitis.

INTRODUCTION: Seladelpar (MBX-8025) is a once-daily administered highly specific PPAR-δ agonist in Phase 3 and extension trials for use in patients with primary biliary cholangitis (PBC). AREAS COVERED: This review provides background on current treatment options for PBC, and summarizes clinical trial data regarding the safety and effectiveness of seladelpar within the context of these treatments. EXPERT OPINION: Clinical trials results demonstrate the safety and tolerability of seladelpar use for PBC, including in patients with cirrhosis. The primary composite endpoint (ALP <1.67 times ULN, decrease ≥ 15% from baseline, and TB ≤ULN) was met in 61.7% of the patients treated with seladelpar and in 20% receiving placebo (p < 0.001). Moreover, pruritus - a cardinal and often intractable symptom of PBC - was improved with seladelpar treatment, as were overall quality of life measurements. Improvements in markers of inflammation were likewise observed. These biochemical and clinical findings therefore represent landmark developments in PBC treatment and offer a therapeutic option for PBC.

Raepenol™ Cream, a Complex of Natural Compounds, Promotes Wound Healing and Relieves Pruritus In Vivo.

BACKGROUND/AIM: Skin wound healing is a physiological process restoring the structural and functional integrity of injured skin. During this process, wound management preventing bacterial infection and complications is important for the regeneration of skin layers and adnexa, as well as the protective function of the skin. Therefore, the development of an effective ointment to promote wound healing without complications is beneficial. MATERIALS AND METHODS: This study developed Raepenol™ cream, comprising a base cream and natural compounds including paeonol, D-panthenol and extract of Centella asiatica, and assessed its therapeutic effect in wound healing. A rat model of skin wound healing and a mouse model of imiquimod-induced pruritus were employed. The effect of Raepenol™ cream was evaluated by wound size and histological analysis, including the integrity of skin structures and inflammatory response. RESULTS: Raepenol™ cream treatment effectively restored the structural integrity of the skin in rats, including wound closure, regeneration of skin adnexa, and reconstitution of collagen, comparable to commercial ointment. Additionally, Raepenol™ cream significantly suppressed pruritus by inhibiting mast cell infiltration or retention in the inflammatory site of mouse ears. CONCLUSION: Raepenol™ cream effectively promoted wound healing and relieved pruritus in animal models. These results suggest that it could be a promising option for wound care and pruritus relief, offering potential advantages over current ointments.

Diospyros lotus leaf extract and its main component myricitrin inhibit itch­related IL­6 and IL­31 by suppressing microglial inflammation and microglial­mediated astrocyte activation.

Diospyros lotus has been traditionally used in Asia for medicinal purposes, exhibiting a broad spectrum of pharmacological effects including antioxidant, neuroprotective and anti­inflammatory properties. While the anti­itch effect of D. lotus leaves has been reported, studies on the detailed mechanism of action in microglia and astrocytes, which are members of the central nervous system, have yet to be revealed. The present study aimed to investigate effects of D. lotus leaf extract (DLE) and its main component myricitrin (MC) on itch­related cytokines and signaling pathways in lipopolysaccharide (LPS)­stimulated microglia. The effect of DLE and MC on activation of astrocyte stimulated by microglia was also examined. Cytokine production was evaluated through reverse transcription PCR and western blot analysis. Signaling pathway was analyzed by performing western blotting and immunofluorescence staining. The effect of microglia on astrocytes activation was evaluated via western blotting for receptors, signaling molecules and itch mediators and confirmed through gene silencing using short interfering RNA. DLE and MC suppressed the production of itch­related cytokine IL­6 and IL­31 in LPS­stimulated microglia. These inhibitory effects were mediated through the blockade of NF­κB, MAPK and JAK/STAT pathways. In astrocytes, stimulation by microglia promoted the expression of itch­related molecules such as oncostatin M receptor, interleukin 31 receptor a, inositol 1,4,5­trisphosphate receptor 1, lipocalin­2 (LCN2), STAT3 and glial fibrillary acidic protein. However, DLE and MC significantly inhibited these receptors. Additionally, astrocytes stimulated by microglia with IL­6, IL­31, or both genes silenced did not show activation of LCN2 or STAT3. The findings of the present study demonstrated that DLE and MC could suppress pruritic activity in astrocytes induced by microglia­derived IL­6 and IL­31. This suggested the potential of DLE and MC as functional materials capable of alleviating pruritus.

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Uremic pruritus, a severe complication in patients with chronic kidney disease, is associated with a high prevalence. It can cause depression and sleep disorders, and seriously affect the quality of life and the social relations of patients. Recently, there is growing evidence showing that κ-opioid receptor agonists, including nalfurafine, difelikefalin, and nalbuphine, can effectively and safely reduce itching symptoms in patients with refractory uremic pruritus. Herein, we reviewed the epidemiology, pathogenesis, clinical symptoms, and treatment strategies of uremic pruritus, and summarized in detail the progress in clinical research on the use of κ-opioid receptor agonists, including nalfurafine, difelikefalin, and nalbuphine, in the management of patients with uremic pruritus.

Antipruritic effect of ursolic acid through MRGPRX2/MrgprB2-dependent inhibition of mast cell degranulation and reduced TSLP production.

Ursolic acid (UA), a pentacyclic triterpene, exhibits diverse pharmacological effects, including potential treatment for allergic diseases. It downregulates thymic stromal lymphopoietin (TSLP) and disrupts mast cell signaling pathways. However, the exact molecular mechanism by which UA interferes with mast cell action remains unclear. Therefore, the current study aimed to uncover molecular entities underlying the effect of UA on mast cells and its potential antipruritic effect, specifically investigating its modulation of key molecules such as TRPV4, PAR2, and MRGPRX2, which are involved in TSLP regulation and sensation. Calcium imaging experiments revealed that UA pretreatment significantly suppressed MRGPRX2 activation (and its mouse orthologue MrgprB2), a G protein-coupled receptor predominantly expressed in mast cells. Molecular docking predictions suggested potential interactions between UA and MRGPRX2/MrgprB2. UA pretreatment also reduced mast cell degranulation through MRGPRX2 and MrgprB2-dependent mechanisms. In a dry skin mouse model, UA administration decreased tryptase and TSLP production in the skin, and diminished TSLP response in the sensory neurons. While PAR2 and TRPV4 activation enhances TSLP production, UA did not inhibit their activity. Notably, UA attenuated compound 48/80-induced scratching behaviors in mice and suppressed spontaneous scratching in a dry skin model. The present study confirms the effective inhibition of UA on MRGPRX2/MrgprB2, leading to reduced mast cell degranulation and suppressed scratching behaviors. These findings highlight the potential of UA as an antipruritic agent for managing various allergy- or itch-related conditions.

Exploring odevixibat's efficacy in alagille syndrome: insights from recent clinical trials and IBAT inhibitor experiences.

INTRODUCTION: Alagille syndrome (ALGS) is a rare, genetic, multisystem disorder commonly associated with cholestatic liver disease; patients with ALGS may experience elevated serum bile acids and severe pruritus with associated impaired sleep. The ileal bile acid transporter (IBAT) is located on the luminal surface of enterocytes in the terminal ileum; this transport protein mediates resorption of conjugated bile acids for recirculation back to the liver. Inhibition of IBAT disrupts the enterohepatic circulation and leads to fecal elimination of bile acids. AREAS COVERED: Here, the role of odevixibat as a novel, nonsurgical approach to interrupting the enterohepatic circulation from the intestine by inhibition of IBAT is reviewed, specifically in reference to currently available data on pharmacologic IBAT inhibition. IBAT inhibition has been shown to reduce serum bile acids and pruritus in trials of cholestatic liver diseases in children including ALGS. EXPERT OPINION: Odevixibat or IBAT inhibitor should be considered as a first-line treatment for ALGS to improve pruritis, quality of life and liver-related outcomes including absence of liver transplant, surgical biliary diversion, hepatic decompensation, and death.

Lysophosphatidic Acid Receptors LPAR5 and LPAR2 Inversely Control Hydroxychloroquine-Evoked Itch and Scratching in Mice.

Lysophosphatidic acids (LPAs) evoke nociception and itch in mice and humans. In this study, we assessed the signaling paths. Hydroxychloroquine was injected intradermally to evoke itch in mice, which evoked an increase of LPAs in the skin and in the thalamus, suggesting that peripheral and central LPA receptors (LPARs) were involved in HCQ-evoked pruriception. To unravel the signaling paths, we assessed the localization of candidate genes and itching behavior in knockout models addressing LPAR5, LPAR2, autotaxin/ENPP2 and the lysophospholipid phosphatases, as well as the plasticity-related genes Prg1/LPPR4 and Prg2/LPPR3. LacZ reporter studies and RNAscope revealed LPAR5 in neurons of the dorsal root ganglia (DRGs) and in skin keratinocytes, LPAR2 in cortical and thalamic neurons, and Prg1 in neuronal structures of the dorsal horn, thalamus and SSC. HCQ-evoked scratching behavior was reduced in sensory neuron-specific Advillin-LPAR5-/- mice (peripheral) but increased in LPAR2-/- and Prg1-/- mice (central), and it was not affected by deficiency of glial autotaxin (GFAP-ENPP2-/-) or Prg2 (PRG2-/-). Heat and mechanical nociception were not affected by any of the genotypes. The behavior suggested that HCQ-mediated itch involves the activation of peripheral LPAR5, which was supported by reduced itch upon treatment with an LPAR5 antagonist and autotaxin inhibitor. Further, HCQ-evoked calcium fluxes were reduced in primary sensory neurons of Advillin-LPAR5-/- mice. The results suggest that LPA-mediated itch is primarily mediated via peripheral LPAR5, suggesting that a topical LPAR5 blocker might suppress "non-histaminergic" itch.

An oil-in-water emulsion containing a combination of ginger extract and synthetic cannabidiol with potent in vitro anti-inflammatory effects alleviates symptoms of atopic dermatitis in a clinical trial.

Atopic dermatitis (AD) is a highly prevalent chronic skin disease. Anti-inflammatory and antipruritic emollients (emollients plus) with excellent cosmetic properties may alleviate AD-related symptoms and reduce the number of exacerbations. To screen for herbal extracts with potent anti-inflammatory and antioxidative potential in human skin cell cultures. Ginger extract and synthetic cannabidiol (CBD) were identified and combined in the cosmetic product BNO 3731, which was evaluated in a randomized clinical trial. Preclinical: anti-inflammatory effects of ginger extract, synthetic CBD and a combination thereof were evaluated in human skin cell cultures by analysing nuclear factor κB activation, release of inflammatory cytokines and endocannabinoid production. Clinical: BNO 3731 was studied in a clinical trial comprising 44 AD patients (adults and children) and compared to a benchmark product over a treatment duration of five days. Symptom severity was evaluated by objective and subjective dermatological assessments as well as physiological skin parameters. Itch intensity was assessed using a numerical rating scale (NRS-11). Preclinical: Ginger extract and synthetic CBD exhibited potent anti-inflammatory and antioxidative effects in vitro which were associated with elevated concentrations of the endocannabinoid, anandamide. Clinical: BNO 3731 significantly alleviated symptoms of AD and improved physiological skin parameters. Itch intensity decreased significantly by 55%, and in 75% of subjects, itch improved ≥2 points on the NRS-11 scale. No adverse events were reported. BNO 3731, containing a unique synergistic combination of ginger extract and synthetic CBD, is an effective and safe treatment option for dry and eczema-prone skin, providing rapid and substantial relief of pruritus.