Gene Expression-based Molecular Scoring of Pancreas Transplant Rejection for a Quantitative Assessment of Rejection Severity and Resistance to Treatment.

Pancreas transplantation improves glycemic control and mortality in patients with diabetes but requires aggressive immunosuppression to control the alloimmune and autoimmune response. Recent developments in "omics' methods have provided gene transcript-based biomarkers for organ transplant rejection. The tissue Common Response Module (tCRM) score is developed to identify the severity of rejection in kidney, heart, liver, and lung transplants. Still, it has not yet been validated in pancreas transplants (PT). We evaluated the tCRM score's relevance in PT and additional markers of acute cellular rejection (ACR) for PT. An analysis on 51 pancreas biopsies with ACR identified 37 genes and 56 genes significantly upregulated in the case of grade 3 and grade 2 ACR respectively (P<0.05). Significant differences were seen with higher grades of rejection among several transcripts. Of the 22 genes differentially expressed in Grade 3 ACR, 18 were also differentially expressed in Grade 2 ACR. The rejection signal was attributable to activated leukocytes' infiltration. Significantly higher tCRM scores were found in grade 3 ACR (p = 0.007) and grade 2 ACR (p = 0.004), compared to normal samples. The tCRM score was able to distinguish treatment-resistant cases from those successfully treated for rejection.

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