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| Title |
Loss of Ovarian Function Results in Increased Loss of Skeletal Muscle in Arthritic Rats
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|---|---|
| Published in |
Revista Brasileira de Ginecologia e Obstetrícia, February 2016
|
| DOI | 10.1055/s-0035-1571265 |
| Pubmed ID | |
| Authors |
Roberto Furlanetto Júnior, Fernanda Martins, Anselmo Oliveira, Paulo Nunes, Márcia Michelin, Eddie Murta, Fábio Orsatti |
| Abstract |
Objective We studied the effects of loss of ovarian function (ovariectomy) on muscle mass of gastrocnemius and the mRNA levels of IGF-1, atrogin-1, MuRF-1, and myostatin in an experimental model of rheumatoid arthritis in rats. Methods We randomly allocated 24 female Wistar rats (9 weeks, 195.3 ± 17.4 grams) into four groups: control (CT-Sham; n = 6); rheumatoid arthritis (RA; n = 6); ovariectomy without rheumatoid arthritis (OV; n = 6); ovariectomy with rheumatoid arthritis (RAOV; n = 6). We performed the ovariectomy (OV and RAOV) or Sham (CT-Sham or RA) procedures at the same time, fifteen days before the rheumatoid arthritis induction. The RA and RAOV groups were immunized and then were injected with Met-BSA in the tibiotarsal joint. After 15 days of intra-articular injections the animals were euthanized. We evaluated the external manifestations of rheumatoid arthritis (perimeter joint) as well as animal weight, and food intake throughout the study. We also analyzed the cross-sectional areas (CSA) of gastrocnemius muscle fibers in 200 fibers (H&E method). In the gastrocnemius muscle, we analyzed mRNA expression by quantitative real time PCR followed by the Livak method (ΔΔCT). Results The rheumatoid arthritis induced reduction in CSA of gastrocnemius muscle fibers. The RAOV group showed a lower CSA of gastrocnemius muscle fibers compared to RA and CT-Sham groups. Skeletal muscle IGF-1 mRNA increased in arthritics and ovariectomized rats. The increased IGF-1 mRNA was higher in OV groups than in the RA and RAOV groups. Antrogin-1 mRNA also increased in the gastrocnemius muscle of arthritic and ovariectomized rats. However, the increased atrogin-1 mRNA was higher in RAOV groups than in the RA and OV groups. Gastrocnemius muscle MuRF-1 mRNA increased in the OV and RAOV groups, but not in the RA and Sham groups. However, the RAOV group showed higher MuRF-1 mRNA than the OV group. The myostatin gene expression was similar in all groups. Conclusion Loss of ovarian function results in increased loss of skeletal muscle-related ubiquitin ligases atrogin-1 and MuRF-1 in arthritic rats. |
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Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Germany | 1 | 50% |
| Brazil | 1 | 50% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 1 | 50% |
| Scientists | 1 | 50% |
Attention Score in Context
This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 13 March 2016.
All research outputs
#17,784,649
of 22,844,985 outputs
Outputs from Revista Brasileira de Ginecologia e Obstetrícia
#85
of 141 outputs
Outputs of similar age
#270,535
of 397,125 outputs
Outputs of similar age from Revista Brasileira de Ginecologia e Obstetrícia
#1
of 2 outputs
Altmetric has tracked 22,844,985 research outputs across all sources so far. This one is in the 19th percentile – i.e., 19% of other outputs scored the same or lower than it.
So far Altmetric has tracked 141 research outputs from this source. They receive a mean Attention Score of 2.0. This one is in the 37th percentile – i.e., 37% of its peers scored the same or lower than it.
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