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alpha methylene gamma butyrolactone/reazioni di ipersensibilità
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Pagina 1 a partire dal 16 risultati
A murine in vitro model of allergic contact dermatitis to sesquiterpene alpha-methylene-gamma-butyrolactones.
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The use of a lymphocyte transformation test (LTT) to provide evidence of allergic contact dermatitis was investigated. The haptens studied were alantolactone and isoalantolactone, two moderate allergens from Inula helenium L., a decorative and medicinal plant. Only alantolactone showed a significant
Synthesis of alpha-methylene-gamma-butyrolactones: a structure-activity relationship study of their allergenic power.
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Thirty-five alpha-methylene-gamma-butyrolactones have been prepared and their allergenic properties tested on the skin of guinea pigs experimentally sensitized to (a) alantolactone (1), (b) isoalantolactone (2), and (c) alpha-methylene-gamma-butyrolactone (3). The two first groups of animals
[Anaphylactic shock to celery and sensitization to ragweed and mugwort. Crossed or concomitant allergy?].
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Two cases of anaphylactoid reaction from hypersensitivity to celery are reported. The two patients were also allergic to ragweed and mugwort pollen. The RAST inhibition test suggested slight cross-allergenicity between celery and mugwort pollen. The common allergenic factor could have been the
The sensitizing capacity of Alstroemeria cultivars in man and guinea pig. Remarks on the occurrence, quantity and irritant and sensitizing potency of their constituents tuliposide A and tulipalin A (alpha-methylene-gamma-butyrolactone).
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Dermatitis in 8 female nursery workers handling Alstroemeria ligtu cultivars has been proven/proved in 6 cases to be of allergic origin. Epicutaneous tests with cut flower extracts as well as with the isolated and purified sensitizer were positive. Successful animal experiments corroborated the
Allergic Contact Dermatitis-Induced Stereospecificity Overview.
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Frequent allergens are known, but not whether allergens are enantiomer specific. Chemicals were tested on guinea pigs and humans to answer this question. Frullanoides showed evident allergic enantiospecificity, whereas the conclusion was shaded for α-methylene-γ-butyrolactone. A link between this
Alpha-methylene-gamma-butyrolactones: versatile skin bioactive natural products.
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Natural products containing an alpha-methylene-gamma-butyrolactone moiety, mainly of the sesquiterpene type, are widely observed in plants, which upon coming into contact with skin, will induce major skin toxicological side effects or phytodermatitis. Indeed two main dermatological pathologies have
A successful murine model for contact sensitization to a sesquiterpene-alpha-methylene-gamma-butyrolactone: sensitization to alantolactone in four strains of mice.
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Induction of allergic contact hypersensitivity to a sesquiterpene lactone, alantolactone, was studied in four strains of mice: C3H/He, DBA/2, Balb/b, and Balb/c. The last three were successfully sensitized. A significant dose/response was demonstrated in these species, as well as an experimental
Evidence for [2 + 2] photoreaction of alpha-methylene-gamma-butyrolactones with thymine: an explanation for chronic actinic dermatitis to sesquiterpene lactones?
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The photoreactivity of isoalantolactone, a natural sesquiterpene lactone, toward thymine was studied. After 313 nm irradiation of a deoxygenated acetone solution of isoalantolactone (2 x 10(-3) M) and thymine (4 x 10(-3) M), two intermolecular [2 + 2] photoadducts, 3 and 4, were isolated with
Allergic contact dermatitis to laurel (Laurus nobilis L.): isolation and identification of haptens.
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Two methods, using methylenelactone dimethylamino adducts, were used to remove selectively alpha-methylene gamma-butyrolactones from Laurus nobilis L. extracts. Isolated lactones were identified and "treated" extracts recovered. Two guinea-pig groups were sensitized to crude extracts and "treated"
Parthenium dermatitis.
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Allergic contact dermatitis (ACD) to Parthenium hysterophorus is the most common cause of plant dermatitis in India. Parthenium dermatitis is caused by dry powder of leaves and flowers and hair-like structures (trichomes). Sesquiterpene lactones (SQLs) are the most important allergens responsible
Chronic actinic dermatitis to sesquiterpene lactones: [2+2] photoreaction toward thymidine of (+) and (-) alpha-methylene-hexahydrobenzofuranone with a cis ring junction.
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(+) and (-) alpha-methylene-hexahydrobenzofuranone derivatives with a stereochemically pure cis ring junction were used as models of sesquiterpene lactones to study their photoreactivity toward thymidine. After 313 nm irradiation of a deoxygenated acetone solution of lactone models and thymidine,
[Peroxides as plant constituents. 8. Guaianolide-peroxides from yarrow,Achillea millefolium L., a soluble component causing yarrow dermatitis].
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From the ether extract of the blossoms of yarrow, Achillea millefolium L., two guaianolides (1, 2) with a peroxide bridged cyclopentane ring and an alpha-methylene-gamma-butyrolactone structure have been isolated. For these compounds the names alpha-peroxyachifolid (1) and beta-peroxyisoachifolid
Contact dermatitis caused by tulips: identification of contact sensitizers in tulip workers of Kashmir Valley in North India.
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BACKGROUND
Tulip, belonging to the genus Tulipa and family Liliaceae, is a spring-blooming perennial that grows from bulbs. Owing to manual handling, contact dermatitis can occur in professionals at any stage of the growth cycle of the tulip plant.
OBJECTIVE
To determine the clinical pattern of
Fingertip dermatitis in a retail florist.
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Prevalence of plant contact dermatitis in retail florists varies with exposure, and the number of reports of contact allergy to cut tulips is rather small. Alpha-methylene-gamma-butyrolactone is better known as the cause of both Alstroemeria dermatitis in retail florists and tulip finger in
A proteomic approach for the identification of immunotoxic properties of Tulipalin A.
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The immune system is permanently exposed to several environmental influences that can have adverse effects on immune cells or organs leading to immunosuppression or inappropriate immunostimulation, called direct immunotoxicity. The natural compound Tulipalin A (TUPA), a lactone with
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