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Distribution of mRNA coding for 5-hydroxytryptamine receptor subtypes in the intestines of healthy dairy cows and dairy cows with cecal dilatation-dislocation.
- Source :
-
American journal of veterinary research [Am J Vet Res] 2006 Jan; Vol. 67 (1), pp. 95-101. - Publication Year :
- 2006
-
Abstract
- Objective: To investigate the distribution of mRNA coding for 7 subtypes of 5-hydroxytryptamine receptors (5-HTRs) in the intestines of healthy dairy cows and dairy cows with cecal dilatation-dislocation (CDD).<br />Sample Population: Full-thickness intestinal wall biopsy specimens were obtained from the ileum, cecum, proximal loop of the ascending colon, and external loop of the spiral colon (ELSC) of 15 cows with CDD (group 1) and 15 healthy dairy cows allocated to 2 control groups (specimens collected during routine laparotomy [group 2] or after cows were slaughtered [group 3]).<br />Procedure: Amounts of mRNA coding for 7 subtypes of 5-HTRs (5-HT1A, 5-HT1B, 5-HT1D, 5-HT1F, 5-HT2A, 5-HT2B, and 5-HT4) were measured by quantitative real-time reverse transcriptase-PCR assay. Results were expressed as the percentage of mRNA expression of a housekeeping gene.<br />Results: Expression of mRNA coding for 5-HTR1B, 5-HTR2B, and 5-HTR4 was significantly lower in cows with CDD than in healthy cows. For 5-HTR2B and 5-HTR4, significant differences between cows with CDD and control cows were most pronounced for the ELSC. Expression of mRNA for 5-HTR1D, 5-HTR1F, and 5-HTR2A was extremely low in all groups, and mRNA for 5-HTR1A was not detected.<br />Conclusions and Clinical Relevance: Relative concentrations of mRNA coding for 5-HTR1B, 5-HT2B, and 5-HTR4 were significantly lower in the intestines of cows with CDD than in the intestines of healthy dairy cows, especially for 5-HT2B and 5-HTR4 in the ELSC. This supports the hypothesis that serotonergic mechanisms, primarily in the spiral colon, are implicated in the pathogenesis of CDD.
- Subjects :
- Analysis of Variance
Animals
Cattle
Cecal Diseases metabolism
Dilatation, Pathologic veterinary
Female
Intestines surgery
Protein Isoforms metabolism
RNA, Messenger genetics
Receptors, Serotonin genetics
Reverse Transcriptase Polymerase Chain Reaction veterinary
Cattle Diseases metabolism
Cecal Diseases veterinary
Genetic Variation
Intestinal Mucosa metabolism
RNA, Messenger metabolism
Receptors, Serotonin metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 0002-9645
- Volume :
- 67
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- American journal of veterinary research
- Publication Type :
- Academic Journal
- Accession number :
- 16426218
- Full Text :
- https://doi.org/10.2460/ajvr.67.1.95