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Toxicologic Pathology
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Articles

Standard Morphologic Evaluation of the Heart in the Laboratory Dog and Monkey

Charlotte M. Keenan and Justin D. Vidal

GlaxoSmithKline, King of Prussia, Pennsylvania 19406, USA

Correspondence: Address correspondence to: Charlotte M. Keenan, GlaxoSmithKline, 709 Swedeland Rd. UE0360, King of Prussia, PA 19406-0939, USA; e-mail:charlotte.m.keenan{at}gsk.com

The nonrodent species most commonly utilized in preclinical safety studies are the purpose-bred beagle dog and cynomolgus macaque (Macaca fascicularis). Potential effects of a new chemical entity (NCE) on the heart pose serious concerns; consequently in vivo testing is focused on detection of functional alterations as well as morphological changes. Macroscopic and microscopic evaluation of the heart is based on a standard survey of key structures to properly assess presence of spontaneous and potential drug-induced lesions. Evaluation of historical controls to determine type and frequency of background change is valuable, as studies with non-rodent species generally have a small sample size. Archived control dog and monkey data were retrospectively reviewed, including terminal body weight (BW), heart weight (HW), and archival glass slides of heart. Control dogs had minimal background changes that included myxomatous or cartilagenous change in the cardiac skeleton and a variable degree of vacuolation in Purkinje fibers. Control monkey hearts commonly contained inflammatory cell infiltrates, myocyte anisokaryosis, and handling artifacts, while myocyte degeneration, squamous plaques, pigment, and intimal plaques were occasionally observed. These findings highlight the utility of consistently recorded and readily accessible archived control data when attempting to discern background spontaneous changes and artifacts from test-article induced changes.

Key Words: Dog • monkey • heart • spontaneous lesion • artifact • cardiovascular

Toxicologic Pathology, Vol. 34, No. 1, 67-74 (2006)
DOI: 10.1080/01926230500369915
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