Biomedical subjects

M G Grant

Publications and source records attributed to M G Grant.

4 recordsLinked to original sources

PubMed2004

Selecting the appropriate rodent diet for endocrine disruptor research and testing studies.

Selecting the optimum diet for endocrine disruptor (ED) research and testing studies in rodents is critical because the diet may determine the sensitivity to detect or properly evaluate an ED compound. Dietary estrogens can profoundly influence many molecular and cellular event actions on estrogen receptors and estrogen-sensitive genes. The source, concentration, relative potency, and significance of dietary estrogens in rodent diets are reviewed, including dietary factors that focus specifically on total metabolizable energy and phytoestrogen content, which potentially affect ED studies in rodents. Research efforts to determine dietary factors in commercially available rodent diets that affect uterotrophic assays and the time of vaginal opening in immature CD-1 mice are summarized. A checklist is provided of important factors to consider when selecting diets for ED research and testing studies in rodents. Specific metabolizable energy levels are recommended for particular bioassays. Discussions include the between-batch variation in content of the phytoestrogens daidzein and genistein, the effects of total metabolizable energy and phytoestrogens on the timing (i.e., acceleration) of vaginal opening, and increased uterine weight in immature CD-1 mice. It is concluded that rodent diets differ significantly in estrogenic activity primarily due to the large variations in phytoestrogen content; therefore animal diets used in all ED studies should ideally be free of endocrine-modulating compounds.

Animal Feed↗

PubMed1991

Takayasu's arteritis in a pregnant woman. A case report.

Takayasu's arteritis in a pregnant white patient is described. This case highlights the fact that, irrespective of race, any patient who presents for the first time in pregnancy with pulseless hypertensive disease or other features suggestive of Takayasu's arteritis, should have their management in labour determined by the number of complications that are present. These are retinopathy, arterial aneurysms, hypertension and aortic regurgitation. These prognostic criteria will result in a classification of patients that will lead to appropriate management.

Adult↗

PubMed1985

Transient hearing loss with metrizamide.

Two case studies are reported in which transient low frequency sensorineural hearing loss was experienced following myelography and CT scanning with metrizamide. Low frequency sensorineural hearing loss is considered to be the result of increased stiffness of one or both of the inner ear membranes. A review of the literature regarding an osmotic relationship between blood, cerebrospinal fluid, and the inner ear fluids attempts to explain how this phenomenon may have occurred with metrizamide. The transient sensorineural loss observed in the case studies presented is compared to the pathophysiology attributed to the formation of endolymphatic hydrops.

Adult↗

PubMed1984

Histologic patterns of congenital nevocytic nevi and implications for treatment.

The therapeutic problems associated with congenital nevocytic nevi (CNN) have lead to a flurry of interest in neonatal dermabrasion. This is based on the theory that nevus cells at birth are superficial and accessible to dermabrasion and that they later migrate into the deeper dermis. We studied twelve patients with CNN, including seven patients less than 3 months of age, with serial biopsies taken over a period of 15 months. In addition, four neonates with giant CNN underwent dermabrasion, and biopsies were obtained pre- and postoperatively. The histologic features of CNN and the implications for treatment are discussed. Our results are inconsistent with the idea of migration of nevus cells into the dermis during infancy. Dermabrasion of giant CNN at an early age may improve the cosmetic appearance; however, it will not remove most nevus cells and is not recommended as an effective treatment for the prevention of melanoma.

Adolescent↗