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(American Journal of Pathology. 2005;167:355-363.)
© 2005 American Society for Investigative Pathology

Glomerular Aging in Females Is a Multi-Stage Reversible Process Mediated by Phenotypic Changes in Progenitors

Zheng Feng*, Anna Rita Plati*, Qing-li Cheng*, Mariana Berho*, Anita Banerjee*, Mylene Potier*, Wen-che Jy{dagger}, Andrew Koff{ddagger}, Liliane J. Striker* and Gary E. Striker*§

From the Departments of Medicine and Surgery, Divisions of Nephrology,* Hematology,{dagger} and Diabetes, Endocrinology, and Metabolism,§ Vascular Biology Institute, University of Miami School of Medicine, Miami, Florida; and the Department of Molecular Biology,{ddagger} Memorial Sloan-Kettering Cancer Center, New York, New York

The glomeruli of postmenopausal C57BL6 mice, and age-matched males, show progressive hypertrophy and glomerulosclerosis. We asked whether this was a multistage process, was due to alterations in glomerular progenitors, and was reversible in female mice. Using cross bone marrow transplants (BMT) between young and old females, we found that BMT delivered a phenotype that was donor age-specific. The fact that lesions in young recipients were more severe if the donors were in late rather than early menopause suggested that new progenitor phenotypes had appeared. Postmenopausal recipients of BMT from young donors had reduced glomerular hypertrophy and sclerosis, implying that the aging lesions in females were reversible and that progenitors, rather than the local environment, determined the glomerular profile. The altered phenotype included increased extracellular matrix synthesis and decreased matrix metalloproteinase-2 levels as well as cell hypertrophy. The mechanism of the cellular hypertrophy was due to uncoupling of hypertrophy from proliferation, resulting from elevated p27 levels. Thus, glomerular hypertrophy and sclerosis in aging females is a multistage process, is reversible, and may be determined by the phenotype of bone marrow-derived progenitor cells.




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