Alterations in amino acid status in cats with feline dysautonomia.
Feline dysautonomia (FD) is a multiple system neuropathy of unknown aetiology. An apparently identical disease occurs in horses (equine grass sickness, EGS), dogs, rabbits, hares, sheep, alpacas and llamas. Horses with acute EGS have a marked reduction in plasma concentrations of the sulphur amino acids (SAA) cyst(e)ine and methionine, which may reflect exposure to a neurotoxic xenobiotic. The aim of this study was to determine whether FD cats have alterations in amino acid profiles similar to those of EGS horses. Amino acids were quantified in plasma/serum from 14 FD cats, 5 healthy in-contact cats which shared housing and diet with the FD cats, and 6 healthy control cats which were housed separately from FD cats and which received a different diet. The adequacy of amino acids in the cats' diet was assessed by determining the amino acid content of tinned and dry pelleted foods collected immediately after occurrences of FD. Compared with controls, FD cats had increased concentrations of many essential amino acids, with the exception of methionine which was significantly reduced, and reductions in most non-essential amino acids. In-contact cats also had inadequate methionine status. Artefactual loss of cysteine during analysis precluded assessment of the cyst(e)ine status. Food analysis indicated that the low methionine status was unlikely to be attributable to dietary inadequacy of methionine or cystine. Multi-mycotoxin screening identified low concentrations of several mycotoxins in dry food from all 3 premises. While this indicates fungal contamination of the food, none of these mycotoxins appears to induce the specific clinico-pathologic features which characterise FD and equivalent multiple system neuropathies in other species. Instead, we hypothesise that ingestion of another, as yet unidentified, dietary neurotoxic mycotoxin or xenobiotic, may cause both the characteristic disease pathology and the plasma SAA depletion.
Royal (Dick) School of Veterinary Studies and The Roslin Institute, University of Edinburgh, Roslin, Midlothian, United Kingdom.
Bruce C
http://orcid.org/0000-0002-6977-6101
BC
McGorum
Freelance, Harrogate, North Yorkshire, United Kingdom.
Herb W
HW
Symonds
School of Veterinary Medicine, University of Glasgow, Glasgow, Strathclyde, United Kingdom.
Clare
C
Knottenbelt
Cave Vet Specialists, Wellington, Somerset, United Kingdom.
Tom A
TA
Cave
Fera Science Limited, Sand Hutton, York, United Kingdom.
Susan J
SJ
MacDonald
Fera Science Limited, Sand Hutton, York, United Kingdom.
Joanna
J
Stratton
Fera Science Limited, Sand Hutton, York, United Kingdom.
Irene
I
Leon
Fera Science Limited, Sand Hutton, York, United Kingdom.
Judith A
JA
Turner
Royal (Dick) School of Veterinary Studies and The Roslin Institute, University of Edinburgh, Roslin, Midlothian, United Kingdom.
R Scott
RS
Pirie
D000596:Amino Acids / Q000097:blood*; D000818:Animals; D002371:Cat Diseases / Q000097:blood*; D002415:Cats; D005260:Female; D008297:Male; D054969:Primary Dysautonomias / Q000097:blood / Q000662:veterinary*
D000596:Amino Acids