1. Streptozotocin-induced diabetes alters transcription of multiple genes necessary for extracellular matrix remodeling in rat patellar tendon.
- Author
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Patel SH, Sabbaghi A, and Carroll CC
- Subjects
- Animals, Collagen Type I genetics, Collagen Type I metabolism, Collagen Type III genetics, Collagen Type III metabolism, Gene Expression Regulation, Male, Matrix Metalloproteinases genetics, Matrix Metalloproteinases metabolism, RNA, Messenger genetics, RNA, Messenger metabolism, Rats, Sprague-Dawley, Diabetes Mellitus, Experimental genetics, Diabetes Mellitus, Experimental pathology, Extracellular Matrix metabolism, Patellar Ligament metabolism, Patellar Ligament pathology, Transcription, Genetic
- Abstract
Overview: Tendon collagen fibril degradation is commonly seen in tendons of diabetics, but the mechanisms responsible for these changes remain to be elucidated. We have demonstrated that streptozotocin (STZ)-induced diabetes increases tendon cell proliferation and collagen content. In the present study, we evaluated that impact of STZ-induced diabetes on mRNA transcripts involved with collagen fibril organization, extracellular matrix (ECM) remodeling, apoptosis, and proliferation., Materials and Methods: Rats were divided into four groups: nondiabetic (control, n = 9), 1 week (acute, n = 8) or 10 weeks of diabetes (chronic, n = 7), and 10 weeks of diabetes with insulin (insulin, n = 8). RNA was isolated from the patellar tendon for determination of mRNA transcripts using droplet digital PCR (ddPCR)., Results: Transcripts for Col1a1, Col3a1, Mmp2, Timp1, Scx, Tnmd, Casp3, Casp8, and Ager were lower in acute relative to control and insulin rats (p ≤ 0.05). With the exception of Scx, transcripts for Col1a1, Col3a1, Mmp2, Timp1, Tnmd, Casp3, Casp8, and Ager were also lower in chronic when compared to control (p < 0.05). Transcripts for Col1a1, Col3a1, Mmp2, Timp1, Tnmd, Casp3, Casp8, and Ager were not different between control and insulin (p > 0.05). Transcripts for Dcn, Mmp1a, Mmp9, Pcna, Tgfbr3, Ptgs2, Ptger2, Ptges, and iNos were not altered by diabetes or insulin (p > 0.05)., Conclusion: Our findings indicated that STZ-induced diabetes results in rapid and large changes in the expression of several genes that are key to ECM remodeling, maintenance, and maturation.
- Published
- 2018
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