Abstract:
BACKGROUND:Fibromyalgia (FM) is a disorder characterized by widespread chronic pain as core symptom and a broad range of comorbidities. Despite the prevalence of gastrointestinal (GI) comorbidities in patients with FM, GI functions have rarely been investigated in animal models of FM. AIMS:The purpose of the present study is to investigate the coexistence of alterations of GI function in the reserpine-induced myalgia (RIM) rat, a validated FM model associated with disruption of monoamine system. METHODS:Paw withdrawal threshold (von Frey hair test) was assessed as pain-associated indicator. Gastric emptying (13C breath test), small intestinal transit (charcoal meal test), and fecal water content were investigated as GI functions. RESULTS:The specific regimen of reserpine for the RIM rat, i.e., 1 mg/kg s.c., once daily for three consecutive days, caused a reduction of paw withdrawal threshold (i.e., mechanical allodynia) on days 3, 5, and 7 after the first injection. The 13CO2 excreted from the RIM rat was significantly increased on day 7. The RIM rat exhibited an acceleration of small intestinal transit on day 5. Fecal water content collected from the RIM rat was significantly increased on days 3 and 5. The amount of noradrenaline was significantly decreased in GI tissues on days 3, 5, and 7 in the RIM rat. Conclusions This study revealed that accelerated gastric emptying, accelerated small intestinal transit, and increase in fecal water content coexist with mechanical allodynia in the RIM rat, simulating the coexistence of chronic pain and alterations of GI function in patients with FM.
journal_name
Dig Dis Scijournal_title
Digestive diseases and sciencesauthors
Uchida M,Kobayashi O,Yoshida M,Miwa M,Miura R,Saito H,Nagakura Ydoi
10.1007/s10620-019-05577-8subject
Has Abstractpub_date
2019-09-01 00:00:00pages
2538-2547issue
9eissn
0163-2116issn
1573-2568pii
10.1007/s10620-019-05577-8journal_volume
64pub_type
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