scholarly journals Impact of Dorsal Root Ganglia Cryoextract on Histological Steatures in Dices and Contractility of Uterus in Differently Aged Rats

2021 ◽  
Vol 31 (3) ◽  
pp. 258-267
Author(s):  
Hanna Nesteruk ◽  
◽  
Viktoriya Ustichenko ◽  
Nataliya Alabedalkarim ◽  
Volodymyr Padalko ◽  
...  
Keyword(s):  
Dorsal Root Ganglia ◽  
Isometric Contraction ◽  
Dorsal Root ◽  
Contractile Activity ◽  
Reproductive Age ◽  
Female Rats ◽  
Saline Control ◽  
Histological Structure ◽  
Aged Rats ◽  
Uterine Contractile

To date, the number of women giving birth to their first child in late reproductive age is increasing around the world. This stipulates a need in designing the new approaches to restore the uterine contractile activity. In this paper, the histological features of uterus and its contractile activity have been experimentally studied in differently aged rats after the dorsal root ganglia cryoextract (DRGCE) administration. The cryoextract was derived from dorsal root ganglia of neonatal piglets by three-fold freezing down to –196°C in saline, followed by thawing at room temperature, homogenization and centrifugation. Here, we used the female rats of reproductive age (RA, 6-month-old) and those of late reproductive age (LRA, 14-month-old). Animals of both age groups received intraperitoneally either DRGCE (experimental groups) or saline (control groups) for 9 days by 0.2 ml. To days 28–29 after administration beginning the animals were sacrificed and the uterine fragments were taken for histological examination and study of oxytocin (OT)-induced uterine contractile activity (UCA). The strength of OT-induced uterine isometric contraction was found to decrease by 28.6% in LRA rats vs. the RA ones. The DRGCE administration to LRA rats increased the UCA indices, namely the contractile frequency, contractile amplitude and strength of isometric contraction augmented by 25, 9.8 and 30% respectively, as compared with the group of the same age without DRGCE introduction. This effect was observed on the background normal uterine histological structure and unchanged myometrial thickness.

scholarly journals Spared Nerve Injury Causes Sexually Dimorphic Mechanical Allodynia and Differential Gene Expression in Spinal Cords and Dorsal Root Ganglia in Rats

2021 ◽  
Author(s):  
F.H.G. Ahlström ◽  
K. Mätlik ◽  
H. Viisanen ◽  
K.J. Blomqvist ◽  
X. Liu ◽  
...  
Keyword(s):  
Gene Expression ◽  
Sex Differences ◽  
Nerve Injury ◽  
Dorsal Root Ganglia ◽  
Dorsal Root ◽  
Mechanical Allodynia ◽  
Female Rats ◽  
Sexually Dimorphic ◽  
Spared Nerve Injury ◽  
Rna Seq

AbstractNeuropathic pain is more prevalent in women. However, females are under-represented in animal experiments, and the mechanisms of sex differences remain inadequately understood. We used the spared nerve injury (SNI) model in rats to characterize sex differences in pain behaviour, unbiased RNA-Seq and proteomics to study the mechanisms. Male and female rats were subjected to SNI- and sham-surgery. Mechanical and cold allodynia were assessed. Ipsilateral lumbar dorsal root ganglia (DRG) and spinal cord (SC) segments were collected for RNA-seq analysis with DESeq2 on Day 7. Cerebrospinal fluid (CSF) samples for proteomic analysis and DRGs and SCs for analysis of IB-4 and CGRP, and IBA1 and GFAP, respectively, were collected on Day 21. Females developed stronger mechanical allodynia. There were no differences between the sexes in CGRP and IB-4 in the DRG or glial cell markers in the SC. No CSF protein showed change following SNI. DRG and SC showed abundant changes in gene expression. Sexually dimorphic responses were found in genes related to T-cells (cd28, ctla4, cd274, cd4, prf1), other immunological responses (dpp4, c5a, cxcr2 and il1b), neuronal transmission (hrh3, thbs4, chrna4 and pdyn), plasticity (atf3, c1qc and reg3b), and others (bhlhe22, mcpt1l, trpv6). We observed significantly stronger mechanical allodynia in females and numerous sexually dimorphic changes in gene expression following SNI in rats. Several genes have previously been linked to NP, while some are novel. Our results suggest gene targets for further studies in the development of new, possibly sex-specific, therapies for NP.

scholarly journals The Adverse Effect of Mobile Phone Radiations on Dorsal Root Ganglion of Albino Rats

2021 ◽  
pp. 54-60
Author(s):  
Faisal Taufiq ◽  
Mohammed Bhilal Babu ◽  
Aqeel Ahmad ◽  
Mohammed Eajaz Ahmed Shariff ◽  
Noureldaim Elnoman Elbadawi ◽  
...  
Keyword(s):  
Dorsal Root Ganglion ◽  
Mobile Phone ◽  
Dorsal Root Ganglia ◽  
Dorsal Root ◽  
Nerve Fibers ◽  
Albino Rats ◽  
Histological Structure ◽  
Myelinated Nerve ◽  
Transmission Electron ◽  
Histomorphological Changes

Objectives: To assess the effect of Mobile Phone Radio Frequency Electromagnetic Radiation (RF-EMR) on the histological structure of dorsal root ganglia in albino rats. Methods: Twenty-four albino rats divided into one control and three experimental groups were studied for four weeks. The experimental groups were exposed to three different levels of RF-EMR through complete missed calls of 80,120 and160 calls per day respectively, using a GSM mobile phone of 0.9GHz to1.8 GHz in silent mode. The dorsal root ganglia of the sacrificed Rats were examined under light and transmission electron microscope (TEM). Results: Dorsal root ganglions of exposed rats showed considerable histological changes like reduction in cell size, condensation of cytoplasm, peripherally located heterochromatin nucleus, loss of nucleolus and densely packed myelinated nerve fibers. No such changes were observed in control rats. Conclusion: Dorsal root ganglionic cells showed enduring and continuous changes when exposed to RF-EMR. The severity of histomorphological changes was dose-dependent, which increased constantly with radiation dosage increment. It might be fair to conclude that degenerative changes in the Dorsal Root Ganglion of the spinal cord, could be attributed to the long-term exposure to RF-EMR.

scholarly journals Silencing the α2 Subunit of γ-aminobutyric Acid Type A Receptors in Rat Dorsal Root Ganglia Reveals Its Major Role in Antinociception Posttraumatic Nerve Injury

2015 ◽  
Vol 123 (3) ◽  
pp. 654-667 ◽  
Author(s):  
Aleksandar L. Obradovic´ ◽  
Joseph Scarpa ◽  
Hari P. Osuru ◽  
Janelle L. Weaver ◽  
Ji-Yong Park ◽  
...  
Keyword(s):  
Sciatic Nerve ◽  
Dorsal Horn ◽  
Nerve Injury ◽  
Dorsal Root Ganglia ◽  
Dorsal Root ◽  
Type A ◽  
Female Rats ◽  
Aminobutyric Acid ◽  
Down Regulation

Abstract Background: Neuropathic pain (NPP) is likely the result of repetitive high-frequency bursts of peripheral afferent activity leading to long-lasting changes in synaptic plasticity in the spinal dorsal horn. Drugs that promote γ-aminobutyric acid (GABA) activity in the dorsal horn provide partial relief of neuropathic symptoms. The authors examined how in vivo silencing of the GABA receptor type A (GABAA) α2 gene in dorsal root ganglia (DRG) controls NPP. Methods: After crush injury to the right sciatic nerve of female rats, the α2 GABAA antisense and mismatch oligodeoxynucleotides or NO-711 (a GABA uptake inhibitor) were applied to the L5 DRG. In vivo behavioral assessment of nociception was conducted before the injury and ensuing 10 days (n = 4 to 10). In vitro quantification of α2 GABAA protein and electrophysiological studies of GABAA currents were performed on acutely dissociated L5 DRG neurons at relevant time points (n = 6 to 14). Results: NPP postcrush injury of a sciatic nerve in adult female rats coincides with significant down-regulation of the α2 subunit expression in the ipsilateral DRG (approximately 30%). Selective down-regulation of α2 expression in DRGs significantly worsens mechanical (2.55 ± 0.75 to 5.16 ± 1.16) and thermal (7.97 ± 0.96 to 5.51 ± 0.75) hypersensitivity in crush-injured animals and causes development of significant mechanical (2.33 ± 0.40 to 5.00 ± 0.33) and thermal (10.80 ± 0.29 to 7.34 ± 0.81) hypersensitivity in sham animals (data shown as mean ± SD). Conversely, up-regulation of endogenous GABA via blockade of its uptake in DRG alleviates NPP. Conclusion: The GABAA receptor in the DRG plays an important role in pathophysiology of NPP caused by sciatic nerve injury and represents promising target for novel pain therapies.

Membrane-associated microtubular areays induced in proximal myelinated processes of dorsal root ganglia by large doses of vitamin B6

1986 ◽  
Vol 44 ◽  
pp. 368-369
Author(s):  
V.J. Montpetit ◽  
S. Dancea ◽  
L. Tryphonas ◽  
D.F. Clapin
Keyword(s):  
Animal Model ◽  
Endoplasmic Reticulum ◽  
Dorsal Root Ganglia ◽  
Rough Endoplasmic Reticulum ◽  
Dorsal Root ◽  
Vitamin B6 ◽  
Morphological Changes ◽  
Model System ◽  
Sensory Nerves ◽  
Peripheral Sensory

Very large doses of pyridoxine (vitamin B6) are neurotoxic in humans, selectively affecting the peripheral sensory nerves. We have undertaken a study of the morphological and biochemical aspects of pyridoxine neurotoxicity in an animal model system. Early morphological changes in dorsal root ganglia (DRG) associated with pyridoxine megadoses include proliferation of neurofilaments, ribosomes, rough endoplasmic reticulum, and Golgi complexes. We present in this report evidence of the formation of unique aggregates of microtubules and membranes in the proximal processes of DRG which are induced by high levels of pyridoxine.

scholarly journals OP0083 DORSAL ROOT GANGLIA INFILTRATING MACROPHAGES MAINTAIN OSTEOARTHRITIS PAIN

2020 ◽  
Vol 79 (Suppl 1) ◽  
pp. 55.2-56
Author(s):  
R. Raoof ◽  
C. Martin ◽  
H. De Visser ◽  
J. Prado ◽  
S. Versteeg ◽  
...  
Keyword(s):  
Knee Joint ◽  
Dorsal Root Ganglia ◽  
Immune Cells ◽  
Dorsal Root ◽  
Weight Bearing ◽  
Joint Damage ◽  
Osteoarthritis Pain ◽  
Knee Pathology ◽  
Femoral Condyles ◽  
Over Time

Background:Pain is a major debilitating symptom of knee osteoarthritis (OA). However, the extent of joint damage in OA does not correlate well with the severity of pain. The mechanisms that govern OA pain are poorly understood. Immune cells infiltrating nervous tissue may contribute to pain maintenance.Objectives:Here we investigated the role of macrophages in the initiation and maintenance of OA pain.Methods:Knee joint damage was induced by an unilateral injection of mono-iodoacetate (MIA) or after application of a groove at the femoral condyles of rats fed on high fat diet. Pain-like behaviors were followed over time using von Frey test and dynamic weight bearing. Joint damage was assessed by histology. Dorsal root ganglia (DRG) infiltrating immune cells were assessed over time using flow cytometry. To deplete monocytes and macrophages, Lysmcrex Csfr1-Stop-DTR were injected intrathecal or systemically with diptheria toxin (DT).Results:Intraarticular monoiodoacetate injection induced OA and signs of persistent pain, such as mechanical hyperalgesia and deficits in weight bearing. The persisting pain-like behaviors were associated with accumulation of F4/80+macrophages with an M1-like phenotype in the lumbar DRG appearing from 1 week after MIA injection, and that persisted till at least 4 weeks after MIA injection. Macrophages infiltrated DRG were also observed in the rat groove model of OA, 12 weeks after application of a groove at the femoral condyles. Systemic or local depletion of DRG macrophages during established MIA-induced OA completely ablated signs of pain, without affecting MIA-induced knee pathology. Intriguingly when monocytes/macrophages were depleted prior to induction of osteoarthritis, pain-like behaviors still developed, however these pain-like behaviors did not persist over time.In vitro,sensory neurons innervating the affected OA joint programmed macrophages into a M1 phenotype. Local repolarization of M1-like DRG macrophages towards M2 by intrathecal injection of M2 macrophages or anti-inflammatory cytokines resolved persistent OA-induced pain.Conclusion:Overall we show that macrophages infiltrate the DRG after knee damage and acquire a M1-like phenotype and maintain pain independent of the lesions in the knee joint. DRG-infiltrating macrophages are not required for induction of OA pain. Reprogramming M1-like DRG-infiltrating macrophages may represent a potential strategy to treat OA pain.Acknowledgments:This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreements No 814244 and No 642720. Dutch Arthritis SocietyDisclosure of Interests:Ramin Raoof: None declared, Christian Martin: None declared, Huub de Visser: None declared, Judith Prado: None declared, Sabine Versteeg: None declared, Anne Heinemans: None declared, Simon Mastbergen: None declared, Floris Lafeber Shareholder of: Co-founder and shareholder of ArthroSave BV, Niels Eijkelkamp: None declared

Sign in / Sign up

Export Citation Format

Share Document