Magnetic resonance imaging (MRI) and pathophysiology of the rat kidney in streptozotocin-induced diabetes

Journal Article · Tue Jan 01 04:00:00 EST 1991 · Magnetic Resonance Imaging; (United States)

DOI:https://doi.org/10.1016/0730-725X(91)90102-R· OSTI ID:5381552

Lohr, J; Mazurchuk, R J; Acara, M A; Nickerson, P A; Fiel, R J ^[1]

---

1. State Univ. of New York, Buffalo (USA)

Proton magnetic resonance imaging was performed on rats before induction of diabetes with streptozotocin (STZ) and at 2 and 12 days postinduction. Images revealed an increase in maximal longitudinal and axial dimensions of the kidneys at 2 days and a further increase at 12 days. Similarly, an increase in the size of the remaining kidney was seen in a rat which underwent uninephrectomy as a positive control. Two major differences were observed between the kidney undergoing compensatory hypertrophy and those developing diabetic nephropathy: (i) Expansion of the renal vasculature was seen only in images of the diabetic rat; (ii) A loss in conspicuity of the normal corticomedullary junction was seen in the T2-weighted images of the diabetic rat but not in the uninephrectomized rat. Histologic examination revealed that the medulla increased to a size greater than the cortex during diabetic nephropathy whereas the medullary volume was less than that of the cortex during compensatory hypertrophy. In vitro T1 relaxation times in cortex, outer medulla and inner medulla of kidneys from control rats were measured and compared with the same respective regions in diabetic rats. When these values were correlated with tissue water content, a linear increase in relaxation rate versus percent water content from cortex to inner medulla was found in the control kidneys, but this correlation was absent in diabetic nephropathy. These studies demonstrate that MRI is an effective noninvasive tool for studying the course of renal hypertrophy and hydration changes in the development of renal disease in STZ-induced diabetes in the rat.

• OSTI ID: 5381552
• Journal Information: Magnetic Resonance Imaging; (United States), Journal Name: Magnetic Resonance Imaging; (United States) Vol. 9:1; ISSN MRIMD; ISSN 0730-725X
• Country of Publication: United States
• Language: English

Related Subjects

550600* -- Medicine
62 RADIOLOGY AND NUCLEAR MEDICINE
ACCURACY
ANIMALS
BARYONS
BODY
DIABETES MELLITUS
DIAGNOSIS
DIAGNOSTIC TECHNIQUES
DISEASES
ELEMENTARY PARTICLES
ENDOCRINE DISEASES
FERMIONS
HADRONS
HYDRATION
HYPERTROPHY
KIDNEYS
MAMMALS
MEDICINE
METABOLIC DISEASES
NEPHRECTOMY
NMR IMAGING
NUCLEONS
ORGANS
PATHOLOGICAL CHANGES
PROTONS
RATS
RODENTS
SOLVATION
SURGERY
UROGENITAL SYSTEM DISEASES
VERTEBRATES