mezerein/inflammation

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NF-kappaB is involved in inhibition of lipoxin A4 on dermal inflammation and hyperplasia induced by mezerein.

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The mechanisms by which lipoxin A(4) (LXA(4)) inhibit skin inflammation remain unclear. In the present studies, the ear inflammatory model was induced by topical application of mezerein. Treatment of the mouse ear with LXA(4) exhibited the inhibitory effects on oedema, neutrophil infiltration,

Neurogenic component of phorbol ester-induced mouse skin inflammation.

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Tumor-promoting phorbol esters are potent inflammatory agents for mouse skin, and the potential mechanistic role of inflammation in tumor promotion is under active investigation. We have shown previously that resiniferatoxin, a uniquely irritant phorbol-related diterpene, acts as a capsaicin

Critical comparison of histological and morphometric changes in SENCAR mouse epidermis in response to n-dodecane, 12-O-tetradecanoylphorbol-13-acetate and mezerein.

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n-Dodecane, a previously little-studied tumor-promoting agent and mezerein, a diterpenoid natural product, have both been reported to have activity primarily in Stage II of two stage tumor promotion in SENCAR mouse skin. Histological changes in this tissue were therefore investigated in response to

Effects of 12-O-tetradecanoylphorbol-13-acetate and mezerein on epidermal ornithine decarboxylase activity, isoproterenol-stimulated levels of cyclic adenosine 3':5'-monophosphate, and induction of mouse skin tumors in vivo.

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The tumor promoter 12-O-tetradecanoylphorbol-13-acetate and the antileukemic agent mezerein are diterpene esters of plant origin with certain structural similarities. Both compounds, when applied topically to mouse skin, were equipotent on a molar basis in inducing hyperplasia, inflammation, and

Silymarin and skin cancer prevention: anti-inflammatory, antioxidant and immunomodulatory effects (Review).

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Several environmental and genetic factors are involved in skin cancer induction, however exposure to chemical carcinogens and solar ultraviolet (UV) radiation are primarily responsible for several skin diseases including skin cancer. Chronic exposure of solar UV radiation to the skin leads to basal

Induction of dark keratinocytes by 12-O-tetradecanoylphorbol-13-acetate and mezerein as an indicator of tumor-promoting efficiency.

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12-O-Tetradecanoylphorbol-13-acetate (TPA) and mezerein (MZ) are diterpene esters of similar structure and approximately equipotent on a molar basis as far as their hyperplasiogenic, inflammatory, and induction of ornithine decarboxylase activity effects in mouse skin are concerned. On the other

Induction of granulocyte-macrophage colony-stimulating activity in mouse skin by inflammatory agents and tumor promoters.

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The granulocyte-macrophage colony stimulating activity (GM-CSA) was assayed in acetic acid extracts of skin from mice which were topically treated with inflammatory and tumor-promoting diterpene esters. Extremely large increases in GM-CSA were found in skin treated with the strongly tumor-promoting

Induction of megakaryocytic colony-stimulating activity in mouse skin by inflammatory agents and tumor promoters.

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The production of megakaryocytic colony-stimulating activity (MEG-CSA) was assayed in acetic acid extracts of skin from mice topically treated with inflammatory and tumor-promoting agents. A rapid induction of MEG-CSA was found in skin treated both with phorbol 12-myristate 13-acetate (PMA), a

Mezerein and 12-deoxyphorbol 13-isobutyrate, protein kinase C ligands with differential biological activities, do not distinguish PKC-isotypes alpha, beta 1, beta 2, and gamma.

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Previous in vitro experiments have shown that the phorbol-like diterpenes 12-deoxyphorbol 13-isobutyrate (dPB), and possibly mezerein, have multiple biological target sites which differ from one another in apparent affinity for dPB by 12.5-780 fold and for mezerein by 24-fold. These two compounds

Effect of triterpenoids on the inflammation induced by protein kinase C activators, neuronally acting irritants and other agents.

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In order to establish the mode of the anti-inflammatory activity of triterpenoids, 11 naturally occurring compounds were assayed on mouse ear oedema induced by the protein kinase C activators, mezerein, 12-O-tetradecanoylphorbol-13-acetate (TPA), two 12-deoxyphorbol-13-monoesters (13-tetradecanoate

Relationship between mezerein-mediated biological responses and phorbol ester receptor occupancy.

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The phorbol ester analog, mezerein, is a weak complete and Stage 1 tumor promoter; however, it is as potent as the most active phorbol esters as a second stage promoter and inflammatory agent. Therefore, mezerein is a useful compound for studying responses associated with Stage 1 or Stage 2

E6201, a novel kinase inhibitor of mitogen-activated protein kinase/extracellular signal-regulated kinase kinase-1 and mitogen-activated protein kinase/extracellular signal-regulated kinase kinase kinase-1: in vivo effects on cutaneous inflammatory responses by topical administration.

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E6201 [(3S,4R,5Z,8S,9S,11E)-14-(ethylamino)-8,9,16-trihydroxy-3,4-dimethyl-3,4,9,10-tetrahydro-1H-2-benzoxacyclotetradecine-1,7(8H)-dione)] is a novel anti-inflammatory agent that has potent inhibitory effects on the production of proinflammatory cytokines from leukocytes and antiproliferative

The effects of the anti-tumor agent mezerein on the cytotoxic capacity and oxidative metabolism of human blood cells.

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Mezerein, the most active antitumor compound isolated from the daphne species of plants, has a structural similarity to phorbol myristate acetate (PMA), the major active compound isolated from croton oil. PMA is known to have tumor promoting activity and is a potent inflammatory agent. Mezerein has

An aspirin-triggered lipoxin A4 stable analog displays a unique topical anti-inflammatory profile.

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Lipoxins and 15-epi-lipoxins are counter-regulatory lipid mediators that modulate leukocyte trafficking and promote the resolution of inflammation. To assess the potential of lipoxins as novel anti-inflammatory agents, a stable 15-epi-lipoxin A(4) analog, 15-epi-16-p-fluorophenoxy-lipoxin A(4)

Vitamin E is a complete tumor promoter in mouse skin.

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The dorsal skins of 6-8 week old female SENCAR mice were initiated with a single application of 10 nmol of 7,12-dimethylbenz[a]anthracene (DMBA) and subsequently promoted twice/week with topical applications of vitamin E (dl-alpha-tocopherol, 80 mumol/treatment). Vitamin E from two separate

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