Articolele autorului Otilia Obreja
Link la profilul stiintific al lui Otilia Obreja

GF induces non-inflammatory localized and lasting mechanical and thermal hypersensitivity in human skin.

Nerve growth factor (NGF) modulates sensitivity and sprouting of nociceptors. We explored the spatial and temporal sensitization induced by NGF injection (1 microg) in human skin. Hyperalgesia was investigated in 16 volunteers (36+/-9 years) at day 1, 3, 7, 21, and 49. Areas of mechanical (brush, pin-prick) and heat (43 degrees C) sensitization were mapped and thermal (heat and cold) pain thresholds, mechanical (impact stimulation) and electrically

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The inflammatory mediators serotonin, prostaglandin E2 and bradykinin evoke calcium influx in rat sensory neurons.

The inflammatory mediators bradykinin, prostaglandin E(2) and serotonin interact to excite and sensitize nociceptive neurons. All three mediators are coupled to signaling pathways that potentially induce rises in intracellular calcium concentration in other models. The aim of this study was therefore to investigate if the three mediators cause calcium rises in isolated rat sensory neurons that may explain their sensitizing action. Neurons exposed

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PKA/AKAP/VR-1 module: A common link of Gs-mediated signaling to thermal hyperalgesia.

Inflammatory mediators not only activate "pain-"sensing neurons, the nociceptors, to trigger acute pain sensations, more important, they increase nociceptor responsiveness to produce inflammatory hyperalgesia. For example, prostaglandins activate G(s)-protein-coupled receptors and initiate cAMP- and protein kinase A (PKA)-mediated processes. We demonstrate for the first time at the cellular level that heat-activated ionic currents were potentiated

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Fast Ca2+-induced potentiation of heat-activated ionic currents requires cAMP/PKA signaling and functional AKAP anchoring.

Calcium influx and the resulting increase in intracellular calcium concentration ([Ca(2+)](i)) can induce enhanced sensitivity to temperature increases in nociceptive neurons. This sensitization accounts for heat hyperalgesia that is regularly observed following the activation of excitatory inward currents by pain-producing mediators. Here we show that rat sensory neurons express calcium-dependent adenylyl cyclases (AC) using RT-PCR and nonradioactive

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Potentiation of nociceptive responses to low pH injections in humans by prostaglandin E2.

Inflammation and trauma lead to tissue acidification and release of inflammatory mediators, including prostaglandin E2 (PGE2). Protons can evoke pain through acid-sensing ion channels (ASICs) and TRPV1 receptors. In this study, we examined whether PGE2 can potentiate proton-induced nociception in humans on injection into skin and muscle. Psychophysical and vascular responses to microinjections of protons (pH 6.0 and 6.5), PGE2 (10-6 and 10-7 M) and

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Comparison of electrically induced flare response patterns in human and pig skin.
Nerve growth factor-evoked nociceptor sensitization in pig skin in vivo.

Peripheral sensitization of skin nociceptors by nerve growth factor (NGF) was explored in pig skin in vivo. As an objective output measure, the area of axon-reflex-mediated erythema was assessed upon mechanical, thermal, chemical, and electrical stimuli delivered at 1, 3, and 7 days after i.d. injection of 1 microg NGF into the pig's back skin (n = 8). Pretreatment with NGF provoked a sensitization to mechanical (600 mN), thermal (10 sec 49 degrees

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Double spikes to single electrical stimulation correlates to spontaneous activity of nociceptors in painful neuropathy patients.

Multiple firing of C nociceptors upon a single electrical stimulus has been suggested to be a possible mechanism contributing to neuropathic pain. Because this phenomenon maybe based on a unidirectional conduction block, it might also be related to neuropathic changes without a direct link to pain. We investigated painful neuropathy patients using microneurography and analysed nociceptors for the occurrence of multiple spiking and spontaneous activity.

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Differential effects of lidocaine on nerve growth factor (NGF)-evoked heat- and mechanical hyperalgesia in humans.

We investigated the effects of a non-specific sodium channel blocker (lidocaine) on heat pain thresholds and mechanical impact pain at day 7 and 21 after intradermal injection of 1 μg NGF. Measurements were performed in 12 healthy male subjects prior to and 5 min after intradermal injection of 150 μl lidocaine administered at concentrations of 0.01% (∼0.4 mM) and 0.1% (∼4 mM) to both NGF and control skin sites. NGF caused a maximum

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NGF-evoked sensitization of muscle fascia nociceptors in humans.

Nerve growth factor (NGF) induces local hyperalgesia for a few days after intramuscular injection, but longer-lasting muscle pain upon systemic administration. As the muscle fascia is densely innervated by free nerve endings, we hypothesized a lasting sensitization of fascia nociceptors by NGF. We administered 1μg NGF (dissolved in 100μL saline) ultrasound-guided to the fascia of the Musculus erector spinae muscle at the lumbar level of 14 male

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