RESUMO
As near-infrared radiation (NIR), which is a composition of sunlight with an 780-1400 nm wavelength, is associated with skin aging such as wrinkles and slacks, the biological actions of NIR with high dermal penetration remains unclear. In the present study, we found that NIR irradiation (40 J/cm2 ) at different levels of irradiance (95-190 mW/cm2 ) using a laboratory device with a xenon flash lamp (780-1700 nm) caused sebaceous gland enlargement concomitantly with skin thickening in the auricle skin of hamsters. The sebaceous gland enlargement resulted from the proliferation of sebocytes due to an increase in the number of proliferating cell nuclear antigen (PCNA)- and lamin B1-positive cells in vivo. In addition, NIR irradiation transcriptionally augmented the production of epidermal growth factor receptor (EGFR) accompanied with an increase in the reactive oxygen species (ROS) level in hamster sebocytes in vitro. Furthermore, the administration of hydrogen peroxide increased the level of EGFR mRNA in the sebocytes. Therefore, these results provide novel evidence that NIR irradiation causes the hyperplasia of sebaceous glands in hamsters by mechanisms in which EGFR production is transcriptionally augmented through ROS-dependent pathways in sebocytes.
Assuntos
Receptores ErbB , Raios Infravermelhos , Doenças das Glândulas Sebáceas , Glândulas Sebáceas , Animais , Cricetinae , Receptores ErbB/metabolismo , Espécies Reativas de Oxigênio/metabolismo , Doenças das Glândulas Sebáceas/etiologia , Doenças das Glândulas Sebáceas/metabolismo , Glândulas Sebáceas/metabolismo , Glândulas Sebáceas/efeitos da radiação , Pele/metabolismo , Pele/efeitos da radiação , Raios Infravermelhos/efeitos adversosRESUMO
BACKGROUND: Neutrophilic sebaceous adenitis is a very rare disease with only three reported cases, all involving men. Herein, we describe the first case in a woman. MATERIALS AND METHODS: A 25-year-old woman presented erythematous and indurated circinate plaques on the face, upper chest and upper limbs, associated with some pustules. The eruption started immediately after sunny holidays and extended progressively with low-grade fever and axillar polyadenopathies. Blood tests showed moderately elevated neutrophils and elevated erythrocyte sedimentation rate. Cutaneous biopsy showed an inflammatory infiltrate composed of lymphocytes, histiocytes and neutrophils with perisebaceous distribution, infiltrating sebaceous glands with focal necrosis of sebocytes. Treatment consisting of topical steroid and photoprotection quickly resulted in regression of the lesions, with no relapse after two months. DISCUSSION: Classically neutrophilic sebaceous adenitis presents as erythematous and violaceous, indurated, circinate plaques with raised edges on the face and upper chest. Spontaneous regression is frequently reported. Histological examination is typical with an inflammatory infiltrate containing neutrophils with primarily perisebaceous distribution and penetrating sebaceous glands in places with necrosis of sebocytes. The aetiology is unknown but in a recent case, photodermatosis was suspected because lesions occurred every summer. This hypothesis is consistent with our observation but the presence of lesions on non-exposed areas raises questions about heat as a possible trigger factor in this disorder.
Assuntos
Eritema/diagnóstico , Neutrófilos/patologia , Doenças das Glândulas Sebáceas/diagnóstico , Corticosteroides/uso terapêutico , Adulto , Biópsia , Eritema/tratamento farmacológico , Eritema/etiologia , Eritema/patologia , Feminino , Febre/etiologia , Histiócitos/patologia , Temperatura Alta/efeitos adversos , Humanos , Doenças Linfáticas/etiologia , Linfócitos/patologia , Doenças das Glândulas Sebáceas/tratamento farmacológico , Doenças das Glândulas Sebáceas/epidemiologia , Doenças das Glândulas Sebáceas/etiologia , Doenças das Glândulas Sebáceas/patologia , Distribuição por Sexo , Pele/patologia , Banho de Sol , Luz Solar/efeitos adversosRESUMO
CONTEXT: Sebaceous gland hypertrophy (SGH) and acne-like skin eruptions are frequent during the first months of life, yet the etiology and prevalence of these conditions in infants are not clear. OBJECTIVE: The objective of the study was to evaluate the association of postnatal androgens with SGH and acne in infants. DESIGN: This was a longitudinal, monthly follow-up from 1 wk (D7) to 6 months of age (M1-M6). PATIENTS: Patients included 54 full-term (FT; 26 boys) and 48 preterm (PT; gestational age at birth 27.7-36.6 wk, 22 boys) infants. MAIN OUTCOME MEASURES: The occurrence of SGH (present/absent) and acne (5-10, 10-50, and >50 papules) was registered and compared with urinary levels of dehydroepiandrosterone and its sulphate and testosterone measured by liquid chromatography-tandem mass spectrometry. RESULTS: SGH was observed in 89% of FT and 96% of PT infants (P = 0.28). Acne (more than five papules) was observed in 91% of FT infants and in 75% of PT infants (P = 0.06). Both SGH and acne were associated with developmental rather than calendar age: SGH was limited to postmenstrual age less than 46 wk and acne was not observed less than 37 wk of postmenstrual age. Urinary androgen levels showed severalfold differences in magnitude between sexes and between the FT and PT groups. After grouping according to sex and maturity, the occurrence of SGH and the severity of acne were associated with higher urinary dehydroepiandrosterone sulphate and testosterone levels in each group. CONCLUSIONS: SGH and acne are common during the first months of life and associated with endogenous, physiologically elevated levels of androgens originating from the adrenals and gonads. These data suggest a novel role for postnatal androgen secretion in infancy.
Assuntos
Acne Vulgar/etiologia , Androgênios/metabolismo , Doenças das Glândulas Sebáceas/etiologia , Glândulas Sebáceas/patologia , Acne Vulgar/congênito , Acne Vulgar/metabolismo , Acne Vulgar/urina , Androgênios/urina , Estudos de Coortes , Sulfato de Desidroepiandrosterona/urina , Feminino , Idade Gestacional , Humanos , Hipertrofia , Recém-Nascido/metabolismo , Recém-Nascido/urina , Doenças do Recém-Nascido/etiologia , Doenças do Recém-Nascido/metabolismo , Doenças do Recém-Nascido/urina , Doenças do Prematuro/etiologia , Doenças do Prematuro/metabolismo , Doenças do Prematuro/urina , Estudos Longitudinais , Masculino , Doenças das Glândulas Sebáceas/congênito , Doenças das Glândulas Sebáceas/metabolismo , Doenças das Glândulas Sebáceas/urina , Glândulas Sebáceas/metabolismo , Testosterona/urina , Fatores de Tempo , UrináliseRESUMO
The human sebaceous gland is a microscopic branched type multiacinar gland been present everywhere on the body except on the palms and soles, whereas they are sparsely located on the dorsum of hands and feet. Several medical conditions are related with sebaceous gland pathology, such as acne, sebaceous hyperplasia, sebaceous adenoma and sebaceous carcinoma. Acne is a common, complex, chronic disorder of the human pilosebaceous unit that mostly occurs in adolescence and young adulthood. The sebaceous gland plays an exquisite role in the initiation of the disease. The multifactorial nature of the pathogenesis of acne includes increased sebum production, alteration of the quality of sebum lipids, inflammatory processes, interaction with neuropeptides and dysregulation of the hormone microenvironment, follicular hyperkeratinization and inflammation maintained by Propionbacterium acnes products within the follicle. On the other hand, the sebaceous gland, as a major and critical compartment of human skin, is also affected through ageing, both intrinsic and extrinsic, which lead to distinct clinical and histological changes. Intrinsic ageing of the sebaceous gland is determined primarily by genetic factors and hormonal status, with androgens playing a major role. A clinical manifestation associated with intrinsic ageing changes is skin xerosis. Extrinsic ageing of human sebaceous gland is mainly caused by accumulating UV irradiation, especially UVA. Photoageing of sebaceous gland is expressed with a wide spectrum of benign and malignant sebaceous tumours, such as sebaceous hyperplasia, sebaceous carcinoma and Muir-Torre syndrome. This review will focus on the pathogenesis of the most common sebaceous gland diseases and their molecular pathways which may represent future pharmaceutical targets.
Assuntos
Doenças das Glândulas Sebáceas/tratamento farmacológico , Doenças das Glândulas Sebáceas/etiologia , Acne Vulgar/tratamento farmacológico , Acne Vulgar/imunologia , Acne Vulgar/microbiologia , Envelhecimento/imunologia , Animais , Anti-Inflamatórios/administração & dosagem , Anti-Inflamatórios/farmacologia , Anti-Inflamatórios/uso terapêutico , Dermatite Atópica/tratamento farmacológico , Dermatite Atópica/etiologia , Dermatite Atópica/genética , Dermatite Atópica/imunologia , Humanos , Imunidade Inata/efeitos dos fármacos , Propionibacterium acnes/imunologia , Doenças das Glândulas Sebáceas/imunologia , Doenças das Glândulas Sebáceas/microbiologia , Neoplasias das Glândulas Sebáceas/tratamento farmacológico , Neoplasias das Glândulas Sebáceas/etiologia , Neoplasias das Glândulas Sebáceas/genética , Neoplasias das Glândulas Sebáceas/imunologiaRESUMO
A 16-year-old girl with polycystic ovarian syndrome presented with numerous rufous papules arising within a large depigmented macule that developed following a severe scald injury on the back. Histopathology revealed that many mature sebaceous glands were growing in the middle and bottom of the epidermis with slight acanthosis. On the basis of patient history, clinical manifestation and histopathology, we suggested that this patient's skin lesion be diagnosed as 'sebaceous hyperplasia within epidermis after scald'.
Assuntos
Queimaduras/complicações , Queimaduras/patologia , Epiderme/patologia , Doenças das Glândulas Sebáceas/etiologia , Doenças das Glândulas Sebáceas/patologia , Glândulas Sebáceas/patologia , Adolescente , Feminino , Humanos , Hiperplasia , Síndrome do Ovário Policístico/complicações , Síndrome do Ovário Policístico/patologiaRESUMO
Niacin has recently been demonstrated to lower blood pressure in hypertensive patients and to reduce cardiovascular events when combined with a statin. As a consequence, niacin has been elevated from being of historical interest as the treatment for pellagra, to being a compound with possible relevance to contemporary therapeutics. In spite of this, niacin deficiency leading to pellagra continues to be a health problem in some countries. Characterized by an exposed-site hyperpigmented dermatitis, pellagra is generally accepted to have been the first photosensitivity syndrome described. At its worst, pellagra manifests as one of the most striking examples of systemic photosensitivity. This is the only photosensitivity syndrome where death is included as a cardinal clinical feature (the often quoted four 'Ds': dermatitis, diarrhoea, dementia and death). However, the pathogenetic mechanism for the photosensitivity caused by niacin deficiency has yet to be determined. This review seeks to update the classification and phenotypic characterization of the various forms of niacin-deficient photosensitivity. Previous speculation about possible mechanisms for the pathogenesis of photosensitivity due to niacin deficiency is reviewed in the context of advances in the understanding of the photochemical basis of photosensitivity reactions. The review concludes by highlighting research required to advance the understanding of this photosensitivity syndrome.
Assuntos
Niacina/deficiência , Pelagra/etiologia , Transtornos de Fotossensibilidade/etiologia , Dieta/efeitos adversos , Feminino , Doenças dos Genitais Femininos/etiologia , Doenças dos Genitais Masculinos/etiologia , Infecções por HIV/complicações , Humanos , Síndromes de Malabsorção/complicações , Masculino , Síndrome do Carcinoide Maligno/complicações , Pelagra/epidemiologia , Transtornos de Fotossensibilidade/diagnóstico , Doenças das Glândulas Sebáceas/etiologia , Dermatopatias/etiologiaRESUMO
Sebaceous adenitis (SA) may be idiopathic (ISA) or associated with other disorders. The purpose of the present study was to compare the cutaneous histopathology of SA in cases in which Leishmania organisms were detected by immunohistochemistry (IHC) with that of cases diagnosed as ISA. Skin sections of 29 patients were evaluated histologically and divided into two groups, one characterized by several epidermal and subepidermal lesions, a granulomatous to pyogranulomatous nodular to diffuse dermatitis involving the sebaceous glands and a positive IHC for Leishmania spp. The other group was characterized by orthokeratotic hyperkeratosis, follicular keratosis with different degrees of pyogranulomatous to granulomatous SA, lack of nodular dermatitis and a negative IHC for Leishmania spp. Hidradenitis was present in both groups. From these results it can be concluded that SA in canine Leishmaniosis (CL) is usually present together with a nodular to diffuse dermal infiltrate and epidermal and subepidermal lesions, and that SA in the absence of dermal inflammation is probably not associated with or suggestive of CL, even in regions where the disease is endemic.
Assuntos
Doenças do Cão/diagnóstico , Leishmaniose/veterinária , Linfadenite/veterinária , Doenças das Glândulas Sebáceas/veterinária , Animais , Doenças do Cão/etiologia , Doenças do Cão/patologia , Cães , Leishmaniose/patologia , Linfadenite/etiologia , Linfadenite/patologia , Doenças das Glândulas Sebáceas/diagnóstico , Doenças das Glândulas Sebáceas/etiologia , Doenças das Glândulas Sebáceas/patologia , Pele/patologiaRESUMO
Sebaceous gland diseases are a group of common dermatological diseases with multiple causes. To date, a systematic report of the risk factors for sebaceous gland diseases in adolescents has not been published. The aim of this study was to assess the prevalence and risk factors for certain sebaceous gland diseases (seborrhea, seborrheic dermatitis, acne, androgenetic alopecia and rosacea) and their relationship to gastrointestinal dysfunction in adolescents. From August-October, 2002-2005, a questionnaire survey was carried out to obtain epidemiological data about sebaceous gland diseases. Using random cluster sampling, 13 215 Han adolescents aged 12-20 years were recruited from four countries or districts (Macau; Guangzhou, China; Malaysia; and Indonesia). The statistical software SPSS ver. 13.0 was used to analyze the data. The prevalence of seborrhea, seborrheic dermatitis, acne, androgenetic alopecia and rosacea was 28.27%, 10.17%, 51.03%, 1.65% and 0.97%, respectively. Based on multivariate logistic regression analysis, the risk factors for sebaceous gland diseases included: age; duration of local residency; halitosis; gastric reflux; abdominal bloating; constipation; sweet food; spicy food; family history of acne; late night sleeping on a daily basis; excessive axillary, body and facial hair; excessive periareolar hair; and anxiety. There was a statistically significant difference in the prevalence of gastrointestinal symptoms (halitosis; gastric reflux; abdominal bloating; constipation) between patients with and without sebaceous gland diseases (chi(2) = 150.743; P = 0.000). Gastrointestinal dysfunction is an important risk factor for diseases of the sebaceous glands and is correlated with their occurrence and development.
Assuntos
Gastroenteropatias/etnologia , Doenças das Glândulas Sebáceas/etnologia , Adolescente , Adulto , Criança , China/etnologia , Feminino , Gastroenteropatias/complicações , Humanos , Indonésia/etnologia , Macau/etnologia , Malásia/etnologia , Masculino , Fatores de Risco , Doenças das Glândulas Sebáceas/etiologiaRESUMO
Se expone el caso clínico de un paciente de 67 años de edad el cual presenta múltiples lesiones papulares, redondeadas, de color amarillento, ubicadas en la mucosa de ambos carrillos (a la altura de los molares superiores y en cercanía con el conducto excretor Stenon de la glándula parótida) y en el fondo de ambos vestíbulos de la mandíbula. A estas lesiones se les dio el diagnóstico definitivo de: Gránulos de Fordyce. De igual manera, en este estudio y basándose en la bibliografía, se señalan en detalle las características clínicas e histológicas más relevantes de estas lesiones, a objeto de orientar al odontólogo en el diagnostico de las mismas para evitar que las confunda con verdaderas patologías
The clinical case of a 67 year old patient is presented. He suffers from multiple papule injuries, rounded, of yellowish color, located in the mucous of both cheeks (at the height of the superior molars and close to the Stenon excretory way of the parotid gland) and at heart of both lobbies of the jaw. These injuries were diagnosed as Fordyce Grains. Likewise, in this study and based on the literature, the clinical and histological details of these injuries are described in detail, in order to guide dentists in their diagnosis and so they do not confuse them with real pathologies.
Assuntos
Humanos , Masculino , Idoso , Coristoma , Doenças das Glândulas Sebáceas/diagnóstico , Doenças das Glândulas Sebáceas/patologia , Doenças das Glândulas Sebáceas/epidemiologia , Biópsia/métodos , Diagnóstico Diferencial , Doenças da Boca/classificação , Doenças da Boca/patologia , Doenças das Glândulas Sebáceas/etiologia , Prognóstico , Venezuela/epidemiologiaRESUMO
Juxta-clavicular beaded lines (JCBL) are unique malformations of sebaceous glands or a variant of sebaceous hyperplasia with characteristic clinical features (1, 2). We describe a patient with JCBL, who received immunosuppressants following kidney transplantation. To our knowledge, our patient is the first case of JCBL in a kidney transplant recipient.