linoleic-acid and Acne-Vulgaris

Our understanding of the pathogenesis of acne vulgaris is still evolving. It is known that multiple factors impact acne pathophysiology, including genetic, hormonal, inflammatory, and environmental influences. Because of its implications in many of these factors, diet has been a part of the acne discussion for decades. Several studies have evaluated the significance of the glycemic index of various foods and glycemic load in patients with acne, demonstrating individuals with acne who consume diets with a low glycemic load have reduced acne lesions compared with individuals on high glycemic load diets. Dairy has also been a focus of study regarding dietary influences on acne; whey proteins responsible for the insulinotropic effects of milk may contribute more to acne development than the actual fat or dairy content. Other studies have examined the effects of omega-3 fatty acid and γ-linoleic acid consumption in individuals with acne, showing individuals with acne benefit from diets consisting of fish and healthy oils, thereby increasing omega-3 and omega-6 fatty acid intake. Recent research into the effects of probiotic administration in individuals with acne present promising results; further study of the effects of probiotics on acne is needed to support the findings of these early studies. In this review, we discuss the current evidence regarding the diets of US patients with acne and how they may impact acne and acne treatment.

Topics: Acne Vulgaris; Dairy Products; Fatty Acids, Omega-3; Feeding Behavior; Glycemic Index; Humans; Linoleic Acid; Probiotics; United States

The pathogenesis of acne is complex, with strong evidence supporting the involvement of sebaceous hyperplasia, follicular hyperkeratinisation, bacterial hypercolonisation, as well as immune reactions and inflammation. High sebum concentrations and follicular hyperkeratinisation lead to a change of the follicular milieu with consecutive proliferation of bacteria, chiefly Propionibacterium acnes. This leads to further increased production of the pro-inflammatory cytokines interleukin-1alpha and tumour necrosis factor alpha by T cells and keratinocytes, leading to proliferation of both cell types. Follicular keratinocytes fail to differentiate by apoptosis and produce hypergranulosis similar to the impermeable skin outer layer, resulting in the formation of microcomedones. Further inflammatory responses lead to the development of increasing degrees of severity in inflammatory forms of acne. Retinoids aid the differentiation and reduce the hyperproliferation of keratinocytes, and can inhibit the migration of leucocytes. Combination therapy using retinoids plus benzoyl peroxide or antibacterials can treat existing acne lesions faster than the individual agents alone and can also prevent the development of new lesions. The new retinoids (e.g. adapalene) have not only the typical potent comedolytic activity but also anti-inflammatory effects. When added to antibacterial therapy, topical retinoids demonstrate faster and significantly greater reduction of inflammatory acne lesions and comedones than antibacterials alone.

Topics: Acne Vulgaris; Administration, Oral; Administration, Topical; Androgens; Anti-Bacterial Agents; Benzoyl Peroxide; Dermatitis; Drug Therapy, Combination; Epithelial Cells; Gram-Positive Bacterial Infections; Humans; Linoleic Acid; Propionibacterium acnes; Retinoids; Sebaceous Glands; Sebum

Topics: Acne Vulgaris; Benzoyl Peroxide; Drug Combinations; Ethanolamines; Gels; Humans; Linoleic Acid; Niacinamide; Pyridones; Salicylic Acid; Treatment Outcome

It has been shown that topical linoleic acid rich-phosphatidylcholine seems to be effective in normalization of follicular hyperkeratinization, whereas nicotinamide has an interesting anti-inflammatory effect. However, little is known about their combined effect on acne. A multicentre, double-blind, 12-week randomized vehicle and parallel-active control study was conducted by clinical and biophysical non-invasive measurements to evaluate the efficacy, tolerability and safety of a 4% nicotinamide-phospholipidic (N-PHCL) emulsion vs. 1% topical clindamycin phosphate applied once daily. Four percentage N-PHCL cosmetic treatment resulted slightly superior to topical clindamycin with all the parameters studied for its better compliance and the global clinical improvement.

Topics: Acne Vulgaris; Administration, Topical; Anti-Bacterial Agents; Clindamycin; Double-Blind Method; Humans; Linoleic Acid; Niacinamide; Phosphatidylcholines

A major pathogenic factor of acne is the disturbed keratinization of the follicular infundibulum. It has been hypothesized that a relative decrease in linoleic acid in the sebum could be responsible, in part, for this. The aim of the present study was objectively to evaluate the effects of topically applied linoleic acid on the size of microcomedones in patients with mild acne. The design was a double-blind placebo-controlled randomized cross-over study. Evaluations were performed by digital image analysis of cyanoacrylate follicular biopsies. There was a significant effect of topically applied linoleic acid on the size of follicular casts and microcomedones, an almost 25% reduction in their overall size being achieved over a 1-month treatment period. In contrast, no change was found at placebo-treated sites. It is concluded that topical linoleic acid might play a role as a comedolytic agent in acne-prone patients.

Topics: Acne Vulgaris; Adolescent; Adult; Child; Cross-Over Studies; Double-Blind Method; Female; Humans; Image Processing, Computer-Assisted; Linoleic Acid; Male

The drug, 13-cis-retinoic acid, which has been demonstrated to have a marked effect on nodulocystic acne, probably has several mechanisms of action. This article summarizes the effects on the sebaceous glands, and the accompanying changes in cutaneous lipids that result from 13-cis-retinoic acid therapy. These changes in lipid composition support the concept that linoleate may be of importance in the pathogenesis of acne.

Topics: Acne Vulgaris; Animals; Clinical Trials as Topic; Fatty Acids; Humans; Isomerism; Isotretinoin; Linoleic Acid; Linoleic Acids; Lipid Metabolism; Sebaceous Glands; Sebum; Skin; Tretinoin

Natural medicines are promising platforms for competent topical treatment modalities benefiting the cosmetic implementation and proffering solutions to the current remedies. Therefore, the objective of this study was to formulate syringic acid (SA), well-known for its multilateral anti-inflammatory, antimicrobial and antioxidant potentials, in newly developed linoleic acid (LA) transferosomes as an anti-acne nano-form remedy. Herein, LA was incorporated in transferosomes owing to its antimicrobial effect and dermal penetrability. Comprehensive appraisal through physicochemical, antioxidant and dermal deposition investigations was conducted. Clinical assessment was also performed in acne patients and compared with the marketed product (Adapalene® gel). The relevant investigations of the optimum formula indicated stable vesicles with a small-sized diameter (147.46 nm), surface charge (-26.86 mV), spherical architecture, reasonable entrapment (76.63%), considerable antioxidant activity (IC50 = 11.1 µg/mL) and remarkable skin deposition (78.72%).More importantly, LA based transferosomes enclosing SA exhibited inflammation lessening in acne sufferers as manifested by greater reduction in the total count of the acne lesions reaching 79.5% in contrast to Adapalene® gel with only 18.7% reduction in acne lesions. Interestingly, no irritation and erythema were reported for the proposed transferosomes. Inclusively, the cosmetic formulation practice could reap benefits of the development of such vesicles.

Topics: Acne Vulgaris; Adapalene; Antioxidants; Clinical Relevance; Gels; Humans; Linoleic Acid; Liposomes

Acne vulgaris is a prevalent skin disease lacking effective and well-tolerated treatment. An earlier study indicated that resveratrol (RVT) has therapeutic effects in acne patients through unknown mechanisms.. To evaluate the effects of RVT on linoleic acid (LA)-induced lipogenesis and peptidoglycan (PGN)-induced inflammation in cultured SZ95 sebocytes in vitro, and to investigate the underlying mechanisms.. RNA-sequencing was used to analyze the whole transcriptome. Nile red staining was used to detect intracellular neutral lipids, whereas lipidomics was used to investigate changes in the lipid profile in sebocytes. Interleukin (IL)-1β and IL-6 mRNA and protein levels were assessed through quantitative real-time PCR and Enzyme-linked immunosorbent assay, respectively. Western blot was used to evaluate the expression of lipogenesis-related proteins, the inflammatory signaling pathway, and the AMP-activated protein kinase (AMPK) pathway. Further, specific small interfering RNA (siRNA) was used to knockdown sirtuin-1 (SIRT1) expression.. RVT inhibited the lipogenesis-related pathway and nuclear factor-kappa B (NF-κB) signaling pathway in SZ95 sebocytes. It also downregulated LA-induced lipogenesis, the expression of lipid-related proteins, and the contents of unsaturated fatty acids. Besides, RVT promoted SIRT1 expression and deacetylation of the NF-κB p65 subunit, thereby lowering IL-1β and IL-6 secretion under PGN induction. Furthermore, pretreatment with AMPK inhibitor Compound C abolished RVT-mediated sebosuppressive and anti-inflammation effects. Meanwhile, SIRT1 silencing abrogated the anti-inflammatory potential of RVT.. In human SZ95 sebocytes, RVT exhibits sebosuppressive and anti-inflammatory effects partially through the AMPK pathway, which may justify the role of RVT treatment in acne vulgaris.

Topics: Acne Vulgaris; AMP-Activated Protein Kinases; Anti-Inflammatory Agents; Cell Line; Gene Knockdown Techniques; Humans; Inflammation; Linoleic Acid; Lipogenesis; Peptidoglycan; Resveratrol; Sebaceous Glands; Signal Transduction; Sirtuin 1

Topics: Acne Vulgaris; alpha-Linolenic Acid; Humans; Lecithins; Linoleic Acid; Linoleic Acids

Topics: Acne Vulgaris; Chromatography, Liquid; Culture Media, Conditioned; Gene Expression Regulation; Humans; Insulin-Like Growth Factor Binding Protein 3; Insulin-Like Growth Factor I; Linoleic Acid; Proteome; Sebaceous Glands; Tandem Mass Spectrometry

Topics: Acne Vulgaris; Androgens; Biopsy, Needle; Disease Progression; Female; Follow-Up Studies; Humans; Immunohistochemistry; Linoleic Acid; Photochemotherapy; Recurrence; Risk Assessment; Sebaceous Glands; Severity of Illness Index; Treatment Outcome; Young Adult

Topics: Acne Vulgaris; Cholestenone 5 alpha-Reductase; Enzyme Inhibitors; Humans; Linoleic Acid; Sebaceous Glands

Topics: Acne Vulgaris; Cholestenone 5 alpha-Reductase; Enzyme Inhibitors; Humans; Linoleic Acid; Sebaceous Glands

The purpose of this study was to investigate the possible role of reactive oxygen species (ROS) generated by neutrophils in mediating acne inflammation. Antibiotics used for the treatment of acne significantly inhibited ROS generated by neutrophils, when compared to other antibiotics. Metronidazole, which is effective in the treatment of acne, markedly inhibited ROS generated by neutrophils. The drug is known to have no significant effect on the growth of Propionibacterium acnes. The proportion of linoleic acid is markedly decreased in acne comedones. Linoleic acid significantly suppressed ROS generated by neutrophils. The ability of neutrophils to produce ROS was significantly increased in patients with acne inflammation. These results seem to reveal the involvement of ROS generated by neutrophils in the disruption of the integrity of the follicular epithelium, which is responsible for inflammatory processes of acne.

Topics: Acne Vulgaris; Anti-Bacterial Agents; Humans; Inflammation; Linoleic Acid; Metronidazole; Neutrophils; Reactive Oxygen Species

On the basis of recent reports that the proportion of linoleic acid (C18:2Cis 9,12), a free fatty acid, is markedly decreased in acne comedones and that tetracycline is effective against acne comedones by acting directly as an antioxidant on infiltrating neutrophils, we investigated the effect of linoleic acid on several inflammatory parameters of neutrophils, including neutrophil chemotaxis, phagocytosis, and generation of reactive oxygen species (ROS). Linoleic acid significantly decreased phagocytosis and the generation of O2-, H2O2, and OH.by neutrophils, whereas it did not significantly inhibit neutrophil chemotaxis or decrease the ROS levels generated in a cell-free, xanthine-xanthine oxidase system. The present study seems to suggest that decreased levels of linoleic acid in acne comedones contribute, in part, to the worsening of acne inflammation by the failure of low levels of linoleic acid to suppress neutrophil phagocytosis and ROS generation.

Topics: Acne Vulgaris; Chemotaxis, Leukocyte; Humans; Linoleic Acid; Linoleic Acids; N-Formylmethionine Leucyl-Phenylalanine; Neutrophils; Oxygen; Phagocytosis

Comedonal lipids and skin surface lipids were collected from six acne patients and surface lipids were collected from sex- and age-matched controls without acne. Six series of ceramides were found in each sample, the relative amounts of which were determined by thin-layer chromatography/photodensitometry. Acylceramides (ceramide 1) were isolated by preparative thin-layer chromatography and their ester-linked fatty acids were analyzed by gas-liquid chromatography. The comedonal acylceramides contained higher proportions of 16:0, 16:1 delta 6, and 18:1 delta 6 + delta 8 and much less linoleate (18:2 delta 9,12) than the acylceramides from the skin surface. In the surface lipids from legs, acylceramides from the acne patients contained less linoleate than the acylceramides from control subjects. Free fatty acids from the comedones were also isolated and analyzed, and had a composition very similar to the esterified fatty acids of comedonal acylceramides. The results confirm that fatty acids derived from sebum become incorporated into comedonal acylceramides, displacing linoleate, and show that this process even affects the acylceramides of surface epidermis, more so in acne patients than in normal subjects.

Topics: Acne Vulgaris; Ceramides; Fatty Acids; Humans; Linoleic Acid; Linoleic Acids; Sebaceous Glands; Skin

Sebaceous wax esters and epidermal acylceramides were isolated from skin surface lipid obtained from children and from young adults. Fatty acid methyl esters (FAME) were prepared from the esterified fatty acids of these lipid classes and analyzed to ascertain the proportions of methyl linoleate (18:2 delta 9,12), methyl sebaleate (18:2 delta 5,8), and methyl sapienate (16:1 delta 6). On the same subjects, 2 measures of sebum secretion rate were obtained, namely the sustainable wax ester secretion rate (WESR) on the forehead and the ratio of wax esters/(cholesterol + cholesterol esters) [WE/(CH + CE)] in the surface lipid. The proportions of methyl linoleate in FAME from the wax esters decreased, and the proportions of methyl sebaleate increased, with increased rates of sebum secretion. For both methyl linoleate and methyl sebaleate, a better correlation was obtained when the ratio of WE/(CH + CE) was used as a measure of sebum secretion rather than the WESR. The proportions of methyl linoleate in the FAME from the acylceramides were also inversely related to ratios of WE/(CH + CE). In acylceramides, linoleate was replaced by sapienate, a major fatty acid of human sebum. It appears, therefore, that sebum fatty acid composition may change with changes in sebaceous gland activity, and that sebum fatty acids can enter the epidermis and be incorporated into epidermal lipids.

Topics: Acne Vulgaris; Adolescent; Adult; Ceramides; Child; Esters; Humans; Linoleic Acid; Linoleic Acids; Sebaceous Glands; Skin; Waxes

Human epidermal surface lipids were collected by an ethanol wash and the ceramides were quantified by thin-layer chromatography-photodensitometry. Six ceramide fractions were isolated and the structural components of each were analyzed in detail. The most unusual of the epidermal ceramides contained a sphingosine base with amide-linked 30- and 32-carbon omega-hydroxyacids and an ester-linked nonhydroxyacid, 41% of which was linoleic acid. The proportion of linoleic acid in the analogous ceramide from comedones was 6%. This supports the hypothesis that a localized insufficiency of linoleic acid in the follicular epithelium is an etiologic factor in comedogenesis.

Topics: Acne Vulgaris; Adult; Animals; Ceramides; Chromatography, Thin Layer; Epidermis; Fatty Acids; Humans; Linoleic Acid; Linoleic Acids; Male; Sphingosine; Swine