Involvement of serotonin and eicosanoids in the rat paw oedema response to the essential oil of Pilocarpus spicatus

Subplantar injection of Pilocarpus spicatus essential oil (PSEO), induced rat hindpaw oedema in a dose-dependent manner. The time course study revealed that when compared to carrageenan-induced oedema, the oedema response to PSEO was greater at 1 h post-injection, and thereafter remained relatively constant until 5 h post-injection. By 24 h, it was still at almost the 50% level. This effect of PSEO was characterized using several inhibitors of oedema formation. Pretreatment with the H1-receptor antagonist chlorpheniramine did not affect this response, while a significant reduction of paw oedema was achieved with the serotonin antagonist methysergide, but only 1 h and 2 h after injection of PSEO. The oedemagenic activity of PSEO was also suppressed by pretreating the rats with the eicosanoid synthesis inhibitors, phenylbutazone, EP 10161 and dexamethasone. This last drug showed the greatest potency. These findings suggested a probable injury to dermal mast cells and liberation of arachidonate metabolites and eicosanoids at the late phase of oedema induced by PSEO.

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Decoding the temporal nature of brain GR activity in the NFκB signal transition leading to depressive-like behavior

Molecular Psychiatry ◽

10.1038/s41380-021-01016-1 ◽

2021 ◽

Author(s):

Young-Min Han ◽

Min Sun Kim ◽

Juyeong Jo ◽

Daiha Shin ◽

Seung-Hae Kwon ◽

...

Keyword(s):

Inhibitory Action ◽

Time Course ◽

Molecular Mechanisms ◽

Late Phase ◽

Fine Tuning ◽

Dependent Manner ◽

Middle Phase ◽

Temporal Shift

AbstractThe fine-tuning of neuroinflammation is crucial for brain homeostasis as well as its immune response. The transcription factor, nuclear factor-κ-B (NFκB) is a key inflammatory player that is antagonized via anti-inflammatory actions exerted by the glucocorticoid receptor (GR). However, technical limitations have restricted our understanding of how GR is involved in the dynamics of NFκB in vivo. In this study, we used an improved lentiviral-based reporter to elucidate the time course of NFκB and GR activities during behavioral changes from sickness to depression induced by a systemic lipopolysaccharide challenge. The trajectory of NFκB activity established a behavioral basis for the NFκB signal transition involved in three phases, sickness-early-phase, normal-middle-phase, and depressive-like-late-phase. The temporal shift in brain GR activity was differentially involved in the transition of NFκB signals during the normal and depressive-like phases. The middle-phase GR effectively inhibited NFκB in a glucocorticoid-dependent manner, but the late-phase GR had no inhibitory action. Furthermore, we revealed the cryptic role of basal GR activity in the early NFκB signal transition, as evidenced by the fact that blocking GR activity with RU486 led to early depressive-like episodes through the emergence of the brain NFκB activity. These results highlight the inhibitory action of GR on NFκB by the basal and activated hypothalamic-pituitary-adrenal (HPA)-axis during body-to-brain inflammatory spread, providing clues about molecular mechanisms underlying systemic inflammation caused by such as COVID-19 infection, leading to depression.

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Anti-inflammatory activity of Syzygium cumini leaf against experimentally induced acute and chronic inflammations in rodents

Alternative Medicine Studies ◽

10.4081/ams.2011.e6 ◽

2011 ◽

Vol 1 (1) ◽

pp. 6 ◽

Cited By ~ 5

Author(s):

Anirban Roy ◽

Sanjib Bhattacharya ◽

Jitendra N. Pandey ◽

Moulisha Biswas

Keyword(s):

Inflammatory Activity ◽

Dependent Manner ◽

Syzygium Cumini ◽

Large Size ◽

Paw Oedema ◽

Chronic Models ◽

Anti Inflammatory ◽

Rat Paw ◽

Dose Dependent ◽

Rat Paw Oedema

Syzygium cumini (L.) Skeels (Myrtaceae), commonly known as Jam in Bengali, Jamun in Hindi and Black Plum or Black Berry in English, is a large size evergreen tree indigenous to India and is cultivated for its fruits. In the present study, the methanol extract of leaves from S. cumini (MESC) was evaluated for anti-inflammatory activity in experimental acute (carrageenan, histamine and serotonin induced rat paw oedema) and chronic models (cotton pellet induced rat granuloma). In all models, the MESC (100 and 200 mg/kg body wt. p.o.) exhibited significant anti-inflammatory activity (p < 0.001) in a dose dependent manner. These findings revealed that the S. cumini leaf had remarkable acute and chronic anti-inflammatory actions in the tested rodent models.

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Comparison of the Respiratory Toxicity and Total Cholinesterase Activities in Dimethyl Versus Diethyl Paraoxon-Poisoned Rats

Toxics ◽

10.3390/toxics7020023 ◽

2019 ◽

Vol 7 (2) ◽

pp. 23 ◽

Cited By ~ 2

Author(s):

Pascal Houzé ◽

Alice Hutin ◽

Marc Lejay ◽

Frédéric J. Baud

Keyword(s):

Time Course ◽

Late Phase ◽

Lethal Dose ◽

Alkoxy Group ◽

Whole Body ◽

Cholinesterase Inhibition ◽

Post Injection ◽

Sprague Dawley ◽

Cholinesterase Activities ◽

Respiratory Toxicity

The chemical structure of organophosphate compounds (OPs) is a well-known factor which modifies the acute toxicity of these compounds. We compared ventilation at rest and cholinesterase activities in male Sprague-Dawley rats poisoned with dimethyl paraoxon (DMPO) and diethyl paraoxon (DEPO) at a subcutaneous dose corresponding to 50% of the median lethal dose (MLD). Ventilation at rest was recorded by whole body plethysmography. Total cholinesterase activities were determined by radiometric assay. Both organophosphates decreased significantly the respiratory rate, resulting from an increase in expiratory time. Dimethyl-induced respiratory toxicity spontaneously reversed within 120 min post-injection. Diethyl-induced respiratory toxicity was long-lasting, more than 180 min post-injection. Both organophosphates decreased cholinesterase activities from 10 to 180 min post-injection with the same degree of inhibition of total cholinesterase within an onset at the same times after injection. There were no significant differences in residual cholinesterase activities between dimethyl and diethyl paraoxon groups at any time. The structure of the alkoxy-group is a determinant factor of the late phase of poisoning, conditioning duration of toxicity without significant effects on the magnitude of alteration of respiratory parameters. For same duration and magnitude of cholinesterase inhibition, there was a strong discrepancy in the time-course of effects between the two compounds.

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Inhibition of phospholipase A2, platelet aggregation and egg albumin induced rat paw oedema as anti-inflammatory effect of Peltophorun pterocarpus stem-bark

Clinical Phytoscience ◽

10.1186/s40816-021-00310-3 ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

Osmund Chukwuma Enechi ◽

Emmanuel Sunday Okeke ◽

Ogochukwu Emmanuel Awoh ◽

Charles Obinwanne Okoye ◽

Chinaza Kyrian Odo

Keyword(s):

Platelet Aggregation ◽

Acute Toxicity ◽

Phospholipase A2 ◽

Phospholipase A ◽

Phytochemical Analysis ◽

Dependent Manner ◽

Egg Albumin ◽

Paw Oedema ◽

Anti Inflammatory ◽

Rat Paw

Abstract Background Most medicinal plants presently employed in traditional medicine are used without scientific evidence, thereby suggesting a need to explore efficient and reliable investigations of their potential. We, therefore, conducted the present study to ascertain the efficacy of flavonoid-rich extract of Peltophorum pterocarpum sterm-bark in the treatment and management of inflammatory disorders as employed in folk medicine. Materials and methods Flavonoid-rich extract of Peltophorum pterocarpum sterm-bark and a total of fifty-five (55) Wistar rats were used for this study. Eighteen (18) mice were used for toxicity testing, and the phytochemical analysis was done using the Trease and Evans method, while the acute toxicity was done using Lorke’s method. In vivo anti-inflammatory study was done using the egg albumin-induced paw oedema method, while the in vitro anti-inflammatory studies were performed for the extract using phospholipase A2 inhibition and calcium chloride-induced platelet aggregation assays. Results The phytochemical analysis revealed that the extract of Peltophorum pterocarpum sterm-bark contains tannins, terpenoids, steroids, phenols, alkaloids, flavonoids, glycosides, and saponins ranging from 0.307 ± 0.02 to 1279.567 ± 149.868. The acute toxicity test of the extract showed no toxicity up to 5000 mg/kg body weight. In the systemic oedema of the rat paw, scalar doses of the extract significantly (p < 0.05) suppressed the development of paw oedema induced by egg albumin, particularly with the Indomethacin (1.77 ± 0.41) when compared with the control (5.50 ± 0.26). However, varying doses of the extract significantly (p < 0.05) inhibited phospholipase A2 activity and CaCl2-Induced platelet aggregation in a concentration, dose, and time-dependent manner, in comparison to prednisolone. Conclusion These results indicate that the extract exhibited anti-inflammatory potential, and the mechanism of this activity has a promising ability to inhibit phospholipase A2 activity and platelet aggregation in rats inflicted with paw oedema.

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A SIMPLE MODEL FOR RAT PAW EDEMA, TIME-COURSE STUDY

The Japanese Journal of Pharmacology ◽

10.1254/jjp.19.323 ◽

1969 ◽

Vol 19 (2) ◽

pp. 323-324 ◽

Cited By ~ 3

Author(s):

AKIRA SAKUMA ◽

SACHIKO OH-ISHI

Keyword(s):

Simple Model ◽

Time Course ◽

Paw Edema ◽

Rat Paw Edema ◽

Time Course Study ◽

Rat Paw

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Anti-inflammatory potentials, membrane stabilizing and xanthine oxidase inhibitory activities of Clerodendrum volibule ethanolic leaf extract on carragenaan- induced inflammation in rats

International Journal of Pharmacology and Toxicology ◽

10.14419/ijpt.v6i1.8410 ◽

2018 ◽

Vol 6 (1) ◽

pp. 7 ◽

Cited By ~ 5

Author(s):

Olarenwaju Olufunmilayo. ◽

OLOGE Mary ◽

Oyemitan Idris ◽

AKOMOLAFE Rufus ◽

Akinpelu Bola ◽

...

Keyword(s):

Xanthine Oxidase ◽

Leaf Extract ◽

Dependent Manner ◽

Inflammatory Conditions ◽

Paw Oedema ◽

Anti Inflammatory ◽

Rat Paw ◽

Dose Dependent ◽

Ethanolic Leaf Extract ◽

Rat Paw Oedema

The folkloric use of Clerodendrum volubile P Beauv (Verbenaceae) for treatment of inflammatory conditions in the Southern part of Nigeria has been reported. The anti-inflammatory action of the ethanolic leaf extract on carrageenan-induced rat paw oedema, lipoxygenase and xanthine oxidase inhibitory effects, and membrane stabilizing potential were evaluated. The extract reduced carrageenan-induced rat paw oedema in a dose dependent manner compared to control group. C. volubile inhibited xanthine oxidase activity in a dose - dependent manner; at 0.5 mg/ml it exhibited maximum inhibitory activity of 95.48% while the standard drug, allopurinol exhibited 70 % inhibition. The extract significantly inhibited lipoxygenase activity, with highest activity at 0.4 mg/ml while Quercetin showed maximum inhibition of the enzyme at 0.1 mg/ml. The extract and Acetaminophen exhibited maximum membrane stabilizing activity of 91.85 ± 0.50% and 94.32 ± 0.32% at 2.5 mg/ml respectively. These findings provide justification for the traditional use of C. volubile in inflammatory conditions.

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Oestrogen secretion by in-vitro perfused testes: species comparison and factors affecting short-term secretion

Journal of Endocrinology ◽

10.1677/joe.0.0960097 ◽

1983 ◽

Vol 96 (1) ◽

pp. 97-105 ◽

Cited By ~ 5

Author(s):

D. L. Thompson ◽

L. L. Ewing ◽

B. L. Lasley

Keyword(s):

High Performance ◽

Time Course ◽

Dependent Manner ◽

Short Term ◽

Factors Affecting ◽

Arterial Perfusion ◽

Testosterone Secretion ◽

Time Course Study ◽

Dose Dependent

Testes from mature rats, rabbits, hamsters, guinea-pigs and dogs were perfused in vitro with added gonadotrophins to study the qualitative and quantitative aspects of oestrogen secretion by these species. After separation by high performance liquid chromatography (HPLC), the major oestrogen secreted by the testes of all five species was oestradiol-17β; lesser amounts of oestrone were also detected for all species. Secretion rates of oestradiol and testosterone were determined for one testis from each of six animals of each species after purification by HPLC. Oestradiol and testosterone secretion varied (P < 0·05) among species on both per testis and per gram of testis bases. The rabbit, which was a high secretor of oestradiol, was used in subsequent experiments to study the factors which affect short-term oestradiol secretion by perfused testes. Luteinizing hormone (NIAMDD-LH-S21) at 100 ng/ml significantly stimulated oestradiol secretion by 2·9-fold and increased testosterone secretion by 155-fold. Follicle-stimulating hormone (NIH-FSH-S11) had no significant effect on secretion of either steroid. In a time-course study in which LH stimulation was started after 45 min of control perfusion, the rates of increase in oestradiol and testosterone secretion over time were similar. Increasing amounts of testosterone added directly to the arterial perfusion medium (0–10 μg/ml) resulted in an increase in oestradiol secretion in the absence of gonadotrophins. Oestradiol secretion increased in a dose-dependent manner up to 1·0 μg testosterone/ml; there was no further stimulation of oestradiol secretion at 10 μg testosterone/ml. When testes were perfused with saturating concentrations of testosterone (10 μg/ml) neither LH nor FSH at 100 ng/ml increased oestradiol secretion above control values. It appears that the major factor affecting oestradiol secretion by in-vitro perfused rabbit testes is the amount of substrate (testosterone) available for aromatization.

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Fibrinolytic, Anti-Inflammatory and Cytotoxic Potentialities of Extracts and Chemical Constituents of Manglicolous Lichen, Graphis ajarekarii Patw. & C. R. Kulk

The Natural Products Journal ◽

10.2174/2210315508666180604101813 ◽

2020 ◽

Vol 10 (1) ◽

pp. 87-93 ◽

Cited By ~ 1

Author(s):

Vinay Bharadwaj Tatipamula ◽

Girija Sastry Vedula

Keyword(s):

Protein Denaturation ◽

Biological Activities ◽

Chemical Constituents ◽

Fibrin Clot ◽

Hydroalcoholic Extract ◽

Paw Oedema ◽

Anti Inflammatory ◽

Rat Paw ◽

Rat Paw Oedema

Background: Lichens which are betide to mangroves are termed as Manglicolous Lichens (ML). As these ML are habituated under stress conditions, they are screened for unique metabolites and biological activities. Objective: The study aimed to establish the chemical and biological profile of ML, Graphis ajarekarii. Methods: The Ethyl Acetate Extract of G. ajarekarii (EAE) was subjected to chromatographic techniques and the obtained isolates were characterized by spectroscopic analysis. The hydroalcoholic extract of G. ajarekarii (AE), EAE, isolates and Hydroalcoholic Extract of host (HE) were evaluated for fibrinolytic (fibrin clot method), in vitro (protein denaturation method) and in vivo (formalin-induced rat paw oedema assay), anti-inflammatory and cytotoxicity (MTT assay) activities. Results: Chemical investigation of the EAE led to the isolation of two known compounds namely atranorin (1) and ribenone (2), which were confirmed by spectral data. The AE and EAE gradually lysed the fibrin clot with 94.54 and 65.07%, respectively, at 24 h. The AE inhibited protein denaturation of about 88.06%, while the standard (Indomethacin) with 93.62%. Similarly, the in vivo antiinflammatory analysis of AE (200 mg/mL) showed potent reduction of rat paw oedema than the standard, whereas EAE and 1 depicted moderate depletion. In addition, the AE revealed prominence inhibition on MCF-7, DU145 and K-562 with IC50 values of 69.5, 42.5 and 38 µg/mL, respectively, whereas the HE exhibited mild inhibitory profile against fibrin clot, inflammation and cancer. Conclusion: From the results, it can be concluded that the G. ajarekarii has an aptitude to act against coagulation, inflammation and cancer cells.

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Time course study of blood pressure in children over a three-year period. Bogalusa Heart Study

Hypertension ◽

10.1161/01.hyp.2.4.102 ◽

1980 ◽

Vol 2 (4) ◽

pp. 102-108 ◽

Cited By ~ 26

Author(s):

A. W. Voors ◽

L. S. Webber ◽

G. S. Berenson

Keyword(s):

Blood Pressure ◽

Time Course ◽

Bogalusa Heart Study ◽

Heart Study ◽

Time Course Study

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Uptake and Distribution of Administered Bone Marrow Mesenchymal Stem Cell Extracellular Vesicles in Retina

Cells ◽

10.3390/cells10040730 ◽

2021 ◽

Vol 10 (4) ◽

pp. 730

Author(s):

Biji Mathew ◽

Leianne A. Torres ◽

Lorea Gamboa Gamboa Acha ◽

Sophie Tran ◽

Alice Liu ◽

...

Keyword(s):

Stem Cell ◽

Mesenchymal Stem Cell ◽

Extracellular Vesicles ◽

Time Course ◽

Ganglion Cells ◽

Ex Vivo ◽

Dependent Manner ◽

Paracrine Effects

Cell replacement therapy using mesenchymal (MSC) and other stem cells has been evaluated for diabetic retinopathy and glaucoma. This approach has significant limitations, including few cells integrated, aberrant growth, and surgical complications. Mesenchymal Stem Cell Exosomes/Extracellular Vesicles (MSC EVs), which include exosomes and microvesicles, are an emerging alternative, promoting immunomodulation, repair, and regeneration by mediating MSC’s paracrine effects. For the clinical translation of EV therapy, it is important to determine the cellular destination and time course of EV uptake in the retina following administration. Here, we tested the cellular fate of EVs using in vivo rat retinas, ex vivo retinal explant, and primary retinal cells. Intravitreally administered fluorescent EVs were rapidly cleared from the vitreous. Retinal ganglion cells (RGCs) had maximal EV fluorescence at 14 days post administration, and microglia at 7 days. Both in vivo and in the explant model, most EVs were no deeper than the inner nuclear layer. Retinal astrocytes, microglia, and mixed neurons in vitro endocytosed EVs in a dose-dependent manner. Thus, our results indicate that intravitreal EVs are suited for the treatment of retinal diseases affecting the inner retina. Modification of the EV surface should be considered for maintaining EVs in the vitreous for prolonged delivery.

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