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Abstract

Objective—To examine the distribution of water in hoof wall specimens of horses via nuclear magnetic resonance (NMR) microscopy and determine changes in water distribution during hydration.

Sample—4 hoof wall specimens (2 obtained from the dorsum and 1 each obtained from the lateral quarter and lateral heel regions) of the stratum medium of healthy hooves of 1 horse.

Procedures—Equine hoof wall specimens were examined via NMR microscopy. Proton density–weighted 3-D images were acquired. Changes during water absorption were assessed on sequential images.

Results—The inner zone of the stratum medium had higher signals than did the outer zone. Areas of high signal intensity were evident in transverse images; these corresponded to the distribution of horn tubules. During water absorption, the increase in signal intensity started at the bottom of a specimen and extended to the upper region; it maintained the localization pattern observed before hydration. The relationship between the local maximal signals in areas corresponding to the horn tubules and minimal signal intensities in areas corresponding to the intertubular horn was similar and maintained approximately a linear distribution.

Conclusions and Clinical Relevance—Based on the premise that signal intensity reflects water content, hydration in the equine hoof wall during water absorption occurred concurrently in the tubules and intertubular horn, and there was maintenance of the original water gradients. This technique can be applied for the assessment of pathophysiologic changes in the hoof wall on the basis of its hydration properties.

Full access
in American Journal of Veterinary Research

SUMMARY

Three kinds of recombinant vaccinia virus (rvv)—mO-ha/ati, LO1-ha/ati and mO-ha/7.5kD—expressing bovine leukosis virus (blv) envelope glycoprotein (gp60) were constructed. The blv envelope gene of rvv mO-ha/ati and LO1-ha/ati or of rvv mO-ha/7.5kD was expressed under control of the promoter of A-type inclusion body (ati) protein gene of cow-pox virus or vaccinia virus 7.5-kD protein gene, respectively. The vaccinia virus strain, LC16mO, was used as vector for rvv mO-ha/ati and mO-ha/7.5kD, and strain LO-1 was used for rvv LO1-ha/ati. Strains LC16mO and LO-1 are attenuated vaccine virus strains originating from the Lister original vaccinia virus.

All 3 kinds of constructed rvv expressed gp60 in cultured rabbit kidney cells after infection; mO-ha/ati expressed more antigen than did mO-ha/7.5kD. Rabbits vaccinated with rvv produced considerable antibody capable of inihibiting syncytium formation, as well as antibody with virion-binding ability. The rvv that used ati promoter induced higher antibody titer than did the rvv that used 7.5-kD promoter. Results indicate that blv gp60 is responsible for induction of neutralizing antibodies that suppress in vitro formation of syncytia among blv-infected cells.

Applicability of rvv, especially those using ati promoter, was evaluated in a vaccine against bovine leukosis.

Free access
in American Journal of Veterinary Research