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Applied and Environmental Microbiology, April 2003, p. 2087-2093, Vol. 69, No. 4
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.4.2087-2093.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Identification of Equine Cecal Bacteria Producing Amines in an In Vitro Model of Carbohydrate Overload

S. R. Bailey,1* M.-L. Baillon,2 A. N. Rycroft,3 P. A. Harris,2 and J. Elliott1

Departments of Veterinary Basic Sciences,1 Pathology and Infectious Diseases, Royal Veterinary College, London,3 The Waltham Centre for Pet Nutrition, Melton Mowbray, Leicestershire, United Kingdom2

Received 2 October 2002/ Accepted 7 January 2003

Acute laminitis has been associated with the overgrowth of gram-positive bacteria within the equine hindgut, causing the release of factor(s) leading to ischemia-reperfusion of the digits. The products of fermentation which trigger acute laminitis are, as yet, unknown; however, vasoactive amines are possible candidates. The objectives of this study were to use an in vitro model of carbohydrate overload to study the change in populations of cecal streptococci and lactobacilli and to establish whether certain species of these bacteria were capable of producing vasoactive amines from amino acids. Cecal contents from 10 horses were divided into aliquots and incubated anaerobically with either corn starch or inulin (fructan; both at 1 g/100 ml). Samples were taken at 6-h intervals over a 24-h period for enumeration of streptococci, lactobacilli, and gram-negative anaerobes by a dilution method onto standard selective growth media. The effects of the antibiotic virginiamycin (1 mg/100 ml) and calcium hydrogen phosphate (CaHPO4; 0.3 g/100 ml) were also examined. Fermentation of excess carbohydrate was associated with increases in numbers of streptococci and lactobacilli (2- to 3.5-log unit increases; inhibited by virginiamycin) but numbers of gram-negative anaerobes were not significantly affected. A screening agar technique followed by 16S rRNA gene sequence analysis enabled the identification of 26 different bacterial strains capable of producing one or more vasoactive amines. These included members of the species Streptococcus bovis and five different Lactobacillus spp. These data suggest that certain bacteria, whose overgrowth is associated with carbohydrate fermentation, are capable of producing vasoactive amines which may play a role in the pathogenesis of acute laminitis.

* Corresponding author. Mailing address: Department of Veterinary Basic Sciences, Royal Veterinary College, Royal College St., London NW1 0TU, United Kingdom. Phone: (44) 20 7468 5266. Fax: (44) 20 7388 1029. E-mail: jelliott{at}rvc.ac.uk.

Applied and Environmental Microbiology, April 2003, p. 2087-2093, Vol. 69, No. 4
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.4.2087-2093.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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