Monica Bernardi

Amedeo Avogadro University of Eastern Piedmont, Novara, Piedmont, Italy

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Publications (2)8.67 Total impact

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    ABSTRACT: The frequency of various types of renal changes in patients with type 2 diabetes is not clearly defined in the literature. Reported discrepancies likely are caused by ethnic and geographic factors. However, policies used in nephrological centers for the selection of patients to undergo renal biopsy also may have an influence. The present study reports 393 renal biopsies in patients with type 2 diabetes performed in a group of centers in northwestern Italy using different (restricted [CRPs] or unrestricted [CUP]) biopsy policies. On the basis of light microscopic, immunofluorescence, and ultrastructural findings, cases were subdivided into three classes characterized by the presence of diabetic glomerulosclerosis (class 1), prevailing vascular (arterioarteriolosclerotic) and ischemic glomerular changes (class 2), other glomerulonephritides superimposed on diabetic glomerulosclerosis (class 3a), or glomerulonephritides without the presence of diabetic glomerulosclerosis (class 3b). Although no significant differences were found for class 2 (detected in 15% and 16% of patients from CRPs and the CUP, respectively), the frequency of the other two classes was strongly biased by the biopsy policy. Class 1 was found in 29% and 51% of cases, and class 3 in 57% and 33% of cases from CRPs and the CUP, respectively. Moreover, class 3a was more common (67%) in the CUP, and class 3b (78%) in CRPs. Our findings may explain conflicting data from the literature and the influence that type of adopted biopsy policy may have on an epidemiological evaluation. This study helps clarify the frequency of renal changes in patients with type 2 diabetes and suggests more extensive use of renal biopsy to obtain reliable prognostic indications and plan a rational therapeutic approach.
    American Journal of Kidney Diseases 05/2002; 39(4):713-20. DOI:10.1053/ajkd.2002.31988 · 5.90 Impact Factor
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    ABSTRACT: The significance of polyomavirus (PV) infection was investigated in a 53-year-old patient who underwent renal transplantation and was treated with triple immunosuppressive therapy (tacrolimus, prednisone, and azathioprine). A renal biopsy taken because of the suspicion of acute rejection showed focal inflammatory interstitial infiltration, tubulitis, and tubular cell nuclear changes consistent with the hypothesis of viral infection. Both the tubular and decoy cells identified by means of urinalysis positively stained for anti-SV40 antibody. Polymerase chain reaction performed on the DNA extracted from renal tissue and isolated from urine showed the presence of an antigenic variant (AS) of the BKV archetype after sequence analysis of the transcription control region (TCR). On the basis of the diagnosis of BKV infection, immunosuppressive therapy was reduced. The patient's renal function improved and was still stable 8 months later when urinalysis showed only a few decoy cells, which were found to be infected by JC but not BK virus. These data suggest that only the BKV, probably favoured by immunosuppressive therapy (tacrolimus), causes renal damage. It is worth underlining that even small and sporadic viral genome mutations may lead to pathologic effects.
    Human Pathlogy 07/2001; 32(6):656-9. DOI:10.1053/hupa.2001.25004 · 2.77 Impact Factor