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At least 379 records · Page 21Linked to original sources
PubMed1975

Dose response to a single injection of azoxymethane in rats. Induction of tumors in the gastrointestinal tract, auditory sebaceous glands, kidney, liver and preputial gland.

Male Fischer rats, 6 weeks old, were injected once with one of five doses of azoxymethane. There was a dose response to the carcinogen as determined by weight gain and tumor induction. Rats given the three highest doses developed tumors of the gastrointestinal tract, auditory sebaceous glands, kidney, liver, and preputial gland, whereas rats receiving the lowest doses had tumors mainly of the intestine. Chronic liver lesions in high-dose rats were cirrhosis with megalocytosis, mild fibrosis, nodular hepatocellular hyperplasia, and hyperplasia of bile ductules.

Adenocarcinoma↗
PubMed1983

The development of the sweat and sebaceous glands in the skin of the one-humped camel (Camelus dromedarius).

The sweat gland primordium appeared as a solid bud from the ental side of the epithelial cords of the growing hair follicles in the CRL 36 cm-fetus from the primary hair follicles and in the CRL 64 cm-fetus from the secondary ones. In the CRL 68 cm-fetus the glands were tubular with a slight curving of their lower third, which became convoluted at the CRL 83 cm-stage. At the latter age, clear myoepithelial cells were observed in the secretory portion as also in the duct. The buds of the sebaceous glands could be observed in the CRL 45 cm-fetus from the primary hair follicles and in the CRL 68 cm-fetus from the secondary ones. At the CRL 83 cm-fetal stage, the branched glands were elongated in shape and opened into the follicles by two separated ducts, united at the hair canal. The glands were in function nearly from its early development.

Animals↗
PubMed1990

Phototoxic damage to sebaceous glands and hair follicles of mice after systemic administration of 5-aminolevulinic acid correlates with localized protoporphyrin IX fluorescence.

The skin of albino mice given 5-aminolevulinic acid (ALA) by intraperitoneal injection rapidly developed the characteristic red fluorescence of protoporphyrin IX. Fluorescence microscopy of frozen tissue sections revealed intense red fluorescence within the sebaceous glands and a much weaker fluorescence within the epidermis and hair follicles. Little or no fluorescence was detected in the dermis, blood vessels, or cartilage of the ear. Light microscopy of skin taken at intervals after whole-body exposure of ALA-injected mice to photoactivating light revealed destruction of sebaceous cells, focal epidermal necrosis with a transient acute inflammation, and diffuse reactive changes in the keratinocytes. The dermis showed transient secondary edema and inflammation. The location and severity of the phototoxic damage correlated well with the location and intensity of the red fluorescence. The light-exposed skin appeared to recover completely except for a persistent reduction in the number of hair follicles.

Aminolevulinic Acid↗
PubMed1991

Juxta-clavicular beaded lines: a subepidermal proliferation of sebaceous gland elements.

Juxta-clavicular beaded lines typical arise at puberty as an asymptomatic, linear papular eruption involving the neck and supraclavicular areas. This entity appears to be more common in blacks than caucasians, and a female predominance has been noted. Microscopically, the papules noted clinically appear secondary to sebaceous gland hyperplasia, which is particularly prominent in the immediate subepidermal zone. Mild papillated epidermal hyperplasia may be observed. Whereas many regard this entity as an anatomic variant of normal, it may be confused clinically and histologically with a number of pathologic processes. A case of juxtaclavicular beaded lines in a 14-year-old caucasian girl is presented.

Adolescent↗
PubMed1983

Comparison of the hydroxyacids from the epidermis and from the sebaceous glands of the horse.

The acylglucosylceramides were isolated from the polar lipids of horse epidermis and examined to determine whether the component omega-hydroxyacids are straight chained as in the corresponding lipids from pig epidermis or branched as in horse sebum. The hydroxyacids from horse epidermis were found to be almost entirely straight chained compounds. The results indicate that sebaceous glands, although derived from epidermal cells, have evolved independent pathways of lipid metabolism.

Animals↗
PubMed1977

Effects of cyproterone acetate and carboxylic acid derivatives on the sebaceous glands of the Syrian hamster.

The Syrian hamster ear model was used to study effects of the anti-androgen cyproterone acetate and of the anti-lipogenic compound 17beta-carboxylic acid methyl ester and its ethyl ester. The steroid derivatives were applied topically in a 1-2% concentration or given systemically. Response of sebaceous gland was measured by means of cell proliferation (3H-TdR autoradiography) and by gland size (histoplanimetry). Cyproterone acetate significantly reduced the labelling and the planimetric value, both topically and systemically. The carboxylic acid derivatives, which block the 5alpha-reductase were ineffective. The new animal model is a sensitive and suitable means to study inhibition of sebum production.

Androgen Antagonists↗
PubMed2002

Monodermal highly specialized teratoma of the ovary: a sebaceous gland tumor.

Teratomas are neoplasms that originate in pluripotential cells and contain representations of all three germ layers in a rather mature state. Specialized forms of teratoma with unilateral development of certain tissues, such as struma ovarii, argentaffin tumors, cholesteatoma, primary choriocarcinoma of the ovary, pseudomucinous cystoma and neurogenic cysts are known. In this paper we describe an ovarian teratoma consisting entirely of sebaceous glands.

Adult↗
PubMed1988

Synergistic antiandrogenic effects of topical combinations of 5 alpha-reductase and androgen receptor inhibitors in the hamster sebaceous glands.

The androgenic action of dihydrotestosterone (DHT) is antagonized by agents that compete with testosterone for the 5 alpha-reductase enzyme and by agents that block the binding of DHT to its receptor. The topical synergistic effect of 5 alpha-reductase (5 alpha RI) and androgen receptor inhibitors (ARI) was determined by measurement of the sebaceous gland size (SGS) of the ventral ear skin of the intact, sexually mature male Syrian hamsters. Progesterone (P), a 5 alpha RI, and spironolactone (SL), an ARI, produced a dose responsive decrease in SGS at topical concentrations of 0.01% to 5.0%. At concentrations of 1, 3, and 5%, P and SL combinations produced neither an additive nor synergistic inhibition of SGS. At very low concentrations of up to 0.10%, neither P nor SL alone produced any effect on SGS. When combinations of these two steroids were applied at low concentrations, SGS decreased unilaterally to approximately 50%. This synergy occurred best at a P:SL ratio of 1:2. The lower effective concentrations of P may be explained by its greater percutaneous absorption. Synergy was also demonstrated at low concentrations with other antiandrogens: cyproterone acetate, canrenone, hydroxyflutamide, and N-N-diethyl-4-methyl-3-oxo-4-aza-5 alpha-androstane- 17 beta-carboxamide. The use of anti-androgen combinations at low concentrations is of value because of the decreased risk of systemic side effects while maintaining potent topical efficacy.

Administration, Topical↗
PubMed1976

[The effect of hydrocortisone on DNA synthesis by sebaceous gland epithelial cells].

The autoradiography method demonstrated a single injection of hydrocortisone (10 mg per 100 g of body weight) to result in suppression of the cell transition from the G1 phase of the mitotic cycle to the S phase and in prolongation of the S phase of the epithelium of the acinar portion (sebocytes) and stratified epithelium of the excretory ducts of the sebaceous gland of rats. Later, after a decrease of the proliferative processes by hydrocortisone there occurred their increase which was higher than control. Hydrocortisone induced a more pronounced effect on the proliferative activity of the stratified epithelium of the excretory ducts than on the sebocytes of the acini.

Animals↗
PubMed1980

Antibodies to outer root sheath of hair. Distinct antigenic properties of the basal cell layer of the outer root sheath below the sebaceous gland canal.

By screening 1500 sera obtained from patients undergoing a bone marrow graft, five sera have been selected which contained antibodies to the basal cell layer (B.C.L.) of the outer root sheath (O.R.S.) of hair follicles. It was demonstrated that these sera reacted with the B.C.L. of the O.R.S. but not with the B.C.L. of the adjacent epidermis. The change in antigenic properties was situated at the orifice of the sebaceous gland canal; thus basal cells below this orifice express an antigen distinct from those expressed by the epidermal basal cells. This is a novel example of tissue specific differentiation antigens that are linked to the type of keratinocyte differentiation.

Animals↗
PubMed1980

Effect of ovariectomy at birth on the regulation of sebaceous glands in rats.

Inbred Sprague-Dawley rats were ovariectomized within 24 h of birth. Sham-operated and untreated male and female rats were also included for comparison. At the age of 80 days, the secretion rate of sebum was assessed from the amount of skin-surface lipids that could be extracted by acetone and which had been produced during 2 days. There were no differences in sebum secretion, when expressed both in relationship to body weight and to surface area of the body, when rats ovariectomized at birth, sham-operated and intact female rats were compared. The removal of the ovaries within 24 h of birth increased the body weight, however. Although the weights of the pituitary, thyroid and adrenal glands, when corrected for body weight, were significantly smaller in rats ovariectomized at birth than in the sham-operated or intact female rats, there were no statistically significant differences in the absolute weights of these endocrine organs between neonatally spayed rats and sham-operated animals. The uterus became atrophic in the absence of ovaries. It has been concluded that the presence or absence of ovaries in the early stage of life had no effect on the activity of the sebaceous glands.

Animals↗
PubMed1998

Differential response of sebaceous glands to exogenous testosterone.

To test the hypothesis that the seborrhoea of acne is an end-organ hyper-response to androgens, a standardized dose of 2% testosterone cream was applied to the forehead of eight prepubertal boys for 6 weeks and the effect determined by measurements of sebum excretion rate (SER). Three boys showed a 15-fold increase in SER and three boys were non-responders, whereas two boys had SER values between those of the responders and non-responders. These data show that sebaceous glands are stimulated by androgens to varying degrees and support the theory of an end-organ response in acne.

Acne Vulgaris↗
PubMed1988

The ovarian-carcinoma-associated sebaceous gland antigen is a member of the HMFG2-positive family of epithelial mucins.

The ovarian-carcinoma-associated sebaceous gland antigen (SGA) defined by the OM-1 monoclonal antibody (McAb) is a highly glycosylated protein of molecular weight approximately 360 kilodaltons. The HMFG1 and HMFG2 McAbs also detect highly glycosylated high-molecular-weight glycoproteins synthesized by a wide variety of human epithelia. Comparison of the distributions of expression of SGA and the molecules detected by the HMFG1 and HMFG2 McAbs showed that SGA was expressed by a strict subset of HMFG1- and HMFG2-positive cells. The relationship of SGA to HMFG1- and HMFG2-positive molecules was subsequently examined at the molecular level. Analysis of immunoprecipitates from biosynthetically labelled ovarian carcinoma cell lines indicated that HMFG1 and HMFG2 reacted with molecules indistinguishable by this method from SGA. Western blot analysis of proteins present in human milk fat globule membrane preparations showed that SGA was present in these preparations together with protein components reactive with the HMFG1 and HMFG2 antibodies. Western blot analysis, probing for the OM-1-reactive determinant, on proteins specifically immunoprecipitated from ovarian cell lysates by the three antibodies conclusively proved that SGA carries the HMFG2 antigenic determinant. Conversely, SGA does not react with the HMFG1 antibody. These results demonstrate the existence in human epithelia of more than one HMFG2-positive molecule. SGA is therefore one of at least two independently expressed HMFG-2-positive human epithelial mucins.

Antibodies, Monoclonal↗
PubMed1987

[Torre-Muir syndrome. Sebaceous gland tumors indicate colon carcinoma and other internal malignant tumors].

The Torre-Muir syndrome belongs to a group of hereditory cancers and expresses itself in the occurrence of cutaneous gland tumors and (often multiple) carcinoma of the colon. The syndrome is probably a phenotypical manifestation of the "cancer family" syndrome, in which familial carcinoma of the colon also occurs. A case of Torre-Muir syndrome in a 43-year-old man is described. Because of the dermatological features, the colon carcinoma was diagnosed in time. Family investigations revealed another case of complete Torre-Muir syndrome, as well as a remarkable frequency of colon carcinoma in one family branch. Inheritance is autosomal dominant. The characteristic morphological features of the sebaceous gland neoplasias makes an early, often life-saving, diagnosis possible.

Adult↗
PubMed1985

The sebaceous gland antigen defined by the OM-1 monoclonal antibody is expressed at high density on the surface of ovarian carcinoma cells.

A monoclonal antibody, designated OM-1, was raised against ovarian serous papillary cystadenocarcinoma (stage IV) cells. This antibody was found to react strongly with primary and metastatic ovarian serous cystadenocarcinomas and endometrioid carcinomas but the antigen detected was either absent or at very low levels in ovarian mucinous adenocarcinomas, clear cell carcinomas, benign serous and mucinous cystadenomas and Brenner tumours. The OM-1 antibody gave no detectable reaction with 93 other human tumours, including examples of breast and colon adenocarcinomas. In normal tissues the OM-1 antibody reacted with normal sebaceous gland cells, lung type II pneumocytes and placental syncytial trophoblasts. In the normal ovary OM-1 reactivity was confined to extremely weak staining of the surface epithelium. No reaction with any other ovarian cell type could be detected. No evidence of reaction with other normal cell populations present in 24 adult and seven foetal tissues was found. The antigen detected is compared with other ovarian tumour-associated antigens. The OM-1 antibody is likely to prove of value in the detection and diagnosis of ovarian carcinoma.

Adenocarcinoma↗