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Inflammation in the uterus induces phosphorylated extracellular signal-regulated kinase and substance P immunoreactivity in dorsal root ganglia neurons innervating both uterus and colon in rats - Source: Journal of Neuroscience Research, online May 2008

  [ 26 votes ]   [ 1 Comment ]
By Victor Chaban, Li Jichang, et al. • • July 27, 2008

In women, clinical studies suggest that pain syndromes such as irritable bowel syndrome and interstitial cystitis [painful bladder], which are associated with visceral hyperalgesia [internal organs' increased pain sensitivity], are often comorbid with endometriosis and chronic pelvic pain.

One of the possible explanations for this phenomenon is viscerovisceral cross-sensitization, in which increased nociceptive [pain signaling] input from an inflamed pelvic organ sensitizes neurons that receive convergent input to the same dorsal root ganglion (DRG) from an unaffected visceral organ. [A DRG is a group of nerve cells located along a spinal nerve that monitors pain and relays information into the spinal cord so it can be analyzed by the brain.]

Nociception induces up-regulation of cellular mechanisms such as phosphorylated extracellular signal-regulated kinase (pERK) and substance P (SP), neurotransmitters associated with induced pain sensation.

The purpose of this study was to determine, in a rodent model, whether uterine inflammation increased the number of pERK- and SP-positive neurons that received input from both the uterus and the colon.

Cell bodies of colonic and uterine DRG were retrogradely labeled with fluorescent tracer dyes microinjected into the colon/rectum and into the uterus. Ganglia were harvested for fluorescent microscopy to identify positively stained neurons. Approximately 6% of neurons were colon specific and 10% uterus specific.

Among these uterus- or colon-specific neurons, up to 3-5% of DRG neurons in the lumbosacral neurons (L1-S3 levels) received input from both visceral organs.

Uterine inflammation increased the number of pERK- and SP-immunoreactive DRG neurons innervating specifically colon, or innervating specifically uterus, and those innervating both organs.

These results suggest that a localized inflammation activates primary visceral afferents, regardless of whether they innervate the affected organ [supply it with nerves]. This visceral sensory integration in the DRG may underlie the observed comorbidity of female pelvic pain syndromes.

Source: Journal of Neuroscience Research, online May 2008. PMID: 18478547, by Li J, Micevych P, McDonald J, Rapkin A, Chaban V. Department of Anesthesiology, Harbor UCLA Medical Center; Departments of Neurobiology and Obstetrics/Gynecology, David Geffen School of Medicine, University of California, Los Angeles; Department of Biomedical Sciences, Charles Drew University of Medicine and Science, Los Angeles, California, USA. [E-mail: Victor Chaban]

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Article Comments Post a Comment

inflamation in the pelvis and colon aftwer hysterectomy
Posted by: englishrose24
Dec 2, 2008
i am still having pelvic pain even though i had a hysterectomy in 2000, i am also having pain in my rectom,and between the base of my spine. i am also have very pain full bladder, at times i end up doubled up on the floor.i have savere pain in my colon when i eat anything with cinnamin in it.the bladder pain ot worst after i fell face down from a hight of about 12 inches off a step,i have been that there is nothing to do damage to as i only have my bladder, left in my pelvis.i had a hysterectomy due to supposed to having endometreosise, but at hte time of my surgery they did not find any, they found that i had a intesternal site where it was connected together.please send me some information on what i should domto find out what i should do about my bladder pain. thanks liz T
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