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The Effectiveness of Probiotic Lactobacillus Rhamnosus nutrients Article The Effectiveness of Probiotic Lactobacillus rhamnosus and Lactobacillus casei Strains in Children with Atopic Dermatitis and Cow’s Milk Protein Allergy: A Multicenter, Randomized, Double Blind, Placebo Controlled Study Bozena˙ Cukrowska 1,*, Aldona Ceregra 2, Elzbieta˙ Maciorkowska 3, Barbara Surowska 4, Maria Agnieszka Zegadło-Mylik 5, Ewa Konopka 1, Ilona Trojanowska 1, Magdalena Zakrzewska 3, Joanna Beata Bierła 1 , Mateusz Zakrzewski 3, Ewelina Kanarek 1 and Ilona Motyl 6 1 Department of Pathomorphology, the Children’s Memorial Health Institute, Aleja Dzieci Polskich 20, 04-730 Warsaw, Poland; [email protected] (E.K.); [email protected] (I.T.); [email protected] (J.B.B.); [email protected] (E.K.) 2 Outpatient Allergology and Dermatology Clinic, Patriotów St. 100, 04-844 Warsaw, Poland; [email protected] 3 Department of Developmental Age Medicine and Paediatric Nursing, Faculty of Health Sciences, Medical University of Bialystok, Szpitalna St. 37, 15-295 Białystok, Poland; [email protected] (E.M.); Citation: Cukrowska, B.; Ceregra, A.; [email protected] (M.Z.); [email protected] (M.Z.) 4 Outpatient Allergology Clinic, the Children’s Memorial Health Institute, Aleja Dzieci Polskich 20, Maciorkowska, E.; Surowska, B.; 04-730 Warsaw, Poland; [email protected] Zegadło-Mylik, M.A.; Konopka, E.; 5 Outpatient Dermatology Clinic, Chodakowska St. 8, 96-503 Sochaczew, Poland; [email protected] Trojanowska, I.; Zakrzewska, M.; 6 Department of Environmental Biotechnology, Lodz University of Technology, Wólcza´nska171/173, Bierła, J.B.; Zakrzewski, M.; et al. The 90-924 Łód´z,Poland; [email protected] Effectiveness of Probiotic Lactobacillus * Correspondence: [email protected]; Tel.: +48-22-815-19-69 rhamnosus and Lactobacillus casei Strains in Children with Atopic Abstract: Probiotics seem to have promising effects in the prevention and treatment of allergic Dermatitis and Cow’s Milk Protein conditions including atopic dermatitis (AD) and food allergy. The purpose of this multicenter Allergy: A Multicenter, Randomized, randomized placebo-controlled trial was to evaluate the effectiveness of a probiotic preparation Double Blind, Placebo Controlled comprising Lactobacillus rhamnosus ŁOCK 0900, Lactobacillus rhamnosus ŁOCK 0908, and Lactobacillus Study. Nutrients 2021, 13, 1169. casei ŁOCK 0918 in children under 2 years of age with AD and a cow’s milk protein (CMP) allergy. https://doi.org/10.3390/nu13041169 The study enrolled 151 children, who—apart from being treated with a CMP elimination diet—were 9 Academic Editor: randomized to receive the probiotic preparation at a daily dose of 10 bacteria or a placebo for three Grazyna Czaja-Bulsa months, with a subsequent nine-month follow-up. The primary outcomes included changes in AD symptom severity assessed with the scoring AD (SCORAD) index and in the proportion of children Received: 2 March 2021 with symptom improvement (a SCORAD score decreased by at least 30% in comparison with that Accepted: 29 March 2021 at baseline). After the three-month intervention, both the probiotic and placebo groups showed a Published: 1 April 2021 significant (p < 0.0001) decrease in SCORAD scores, which was maintained nine months later. The percentage of children who showed improvement was significantly higher in the probiotic than Publisher’s Note: MDPI stays neutral in the placebo group (odds ratio (OR) 2.56; 95% confidence interval (CI) 1.13–5.8; p = 0.012) after with regard to jurisdictional claims in three months. Probiotics induced SCORAD improvement mainly in allergen sensitized patients (OR published maps and institutional affil- 6.03; 95% CI 1.85–19.67, p = 0.001), but this positive effect was not observed after nine months. The iations. results showed that the mixture of probiotic ŁOCK strains offers benefits for children with AD and CMP allergy. Further research is necessary to assess the effect of probiotic supplementation on the development of immune tolerance (NCT04738565). Copyright: © 2021 by the authors. Keywords: probiotics; atopic dermatitis; food allergy; cow’s milk protein allergy; Lactobacillus Licensee MDPI, Basel, Switzerland. rhamnosus; Lactobacillus casei This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). Nutrients 2021, 13, 1169. https://doi.org/10.3390/nu13041169 https://www.mdpi.com/journal/nutrients Nutrients 2021, 13, 1169 2 of 16 1. Introduction Atopic dermatitis (AD), a chronic and recurrent skin disease of allergic origin that affects people with genetic predisposition, is characterized by intimal hyperplasia, dry skin, and periodic inflammatory and exudative lesions [1]. AD is characterized by epithelial barrier defects and dysregulation of both the innate and adaptive immune response against different triggers. Recently, cytokines and other mediators that play an important role in the pathogenesis of skin inflammation have become a target for new forms of therapy [2,3]. Drugs for which interleukin (IL)-4 and IL-13—the main cytokines of T helper 2 (Th2) immune activation—are the targets, are particularly represented. Dupilumab, a human anti-IL-4 receptor α monoclonal antibody that blocks IL-4- and IL-13-mediated signaling pathways, is the first biological drug approved by Food and Drug Administration for the treatment of moderate-to-severe AD in adolescents and adults [3]. Another approved therapeutic option for topical use is crisaborole, a phosphodiesterase-4 inhibitor which is a key regulator in the inflammatory cytokine cascade [3]. AD is one of the most common chronic childhood diseases, affecting approximately 10–20% of children in Europe [4]. AD usually starts in early childhood and may represent the first step of the so-called “atopic march”, which represents the natural history of allergic manifestations, characterized by a sequence of atopic diseases preceding the development of other allergic disorders later in life [5]. Typically, AD in infancy is followed by allergic rhinitis and/or asthma later in life [6]. Although the etiology of AD is still not clear, it has been reported that more than half of all children with AD are sensitized to one or more allergens with a predominance of food allergens [7,8], indicating their significant role in the early activation of the pro-allergic immune response. Over the last few decades, there has been an increasing trend in the incidence of AD and food allergy, especially noticeable in highly developed countries, which is associated with a strict hygiene regime, increased use of detergents, low number of children per family, altered nutritional habits, frequent antibiotic therapy, low incidence of infectious diseases, and high numbers of Cesarean sections [9]. The Western lifestyle is believed to effect a change in the composition of gut microbiota which may activate pro-allergic mechanisms. Children with AD show a low biodiversity of their gut microbiota, particularly a lack of Bacteroides diversity, and a high prevalence of Clostridium difficile colonization [10,11]. Therefore, one of the prophylactic and therapeutic measures in allergies may involve the use of probiotics [12]. The World Allergy Organization guideline panel suggests to use probiotics for prevention of allergy in pregnant women at high risk for having an allergic child, in women who breastfeed infants at high risk of developing allergy, and in infants at high risk of developing allergy [13]. Probiotics are defined as live microorganisms which, when administered at the right dose, have a positive effect on human health [14]. Experts emphasize that the clinical effects of probiotics are strain-dependent. The probiotic strain Lactobacillus rhamnosus GG (LGG) is one of the few strains that had been evaluated in pedi- atric patients with AD in various research centers using the same study protocol [15–18]. The results of these studies show that it is not only strain selection but also the target population that matters. Beneficial therapeutic effects of LGG in AD were demonstrated in a population of Finnish children [15], whereas no such effects were found either in Dutch or German patients [16–18]. A similar outcome pattern was observed in studies evaluating LGG supplementation for the primary prevention of AD. The observed prevalence of AD after 2–4 and seven years was significantly lower when LGG was administrated to pregnant women and then to infants, but only in the Finnish population [19–21]. In contrast, in the German population such supplementation did not inhibit AD development. In fact, it increased the risk of wheezing by the age of two years [22]. The lack of probiotic effect in some populations may be a result of intestinal microbiota composition differences, which may be due to such factors as the geographic location. Thus, our research team attempted a search for new probiotic strains that could be used both in primary allergy prevention and as a complement to AD treatment. In 2009, three probiotic strains were selected out of 24 strains isolated from healthy Polish subjects [23]. We reported that the mixture of these Nutrients 2021, 13, 1169 3 of 16 strains had a synergistic effect on cytokine production in blood cell cultures obtained from AD infants [24]. The strains induced activation of Th1 cytokines and regulatory IL-10, and inhibition of pro-allergic IL-5. In the present randomized double-blind placebo-controlled clinical trial we supple- mented AD children under the age of two years with these selected probiotic strains in order to observe their effect on the clinical course of the disease assessed with the SCORing Atopic Dermatitis (SCORAD) index [25]. 2. Materials and Methods 2.1. The Study Design This was a randomized, double-blind, placebo-controlled, parallel-group study con- ducted at four Polish centers (the outpatient allergic clinic of the Children’s Memorial Health Institute in Warsaw, the outpatient allergic clinic of the Medical University in Białystok, the outpatient dermatology and allergic clinic in Warsaw, and the outpatient dermatology clinic in Sochaczew) between June 2012 and December 2015.
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