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Published on: August 21, 2021
Decrease in cell proliferation by an matrix metalloproteinase inhibitor, doxycycline, in a model of immune-complex
Funda Saglam1, Ali Celik, Devrim Tayfur
1Departments of Nephrology, Dokuz Eylul University School of Medicine, Balcova, Turkey. funda.saglam@deu.edu.tr
Aim:
Renal expression of matrix metalloproteinases (MMP) and tissue inhibitors of MMP (TIMP) contribute to the development of tubulointerstitial fibrosis characteristic of progressive forms of primary glomerulonephritis (GN). The aim of this study was to investigate the therapeutic effect of MMP inhibitor, doxycycline, administration in an experimental rat model of immune-complex nephritis (ICN).
Methods:
The induction of immune-complex glomerulonephritis was carried out by the administration of an i.v. dose of 2 mg bovine serum albumin (BSA) daily for 28 days after 8 weeks of s.c. immunization with 1 mg of BSA in complete Freund's adjuvant. Doxycycline (30 mg/kg) was given daily (in groups 2 and 4) by gavage for 28 days.
Results:
Animals treated with doxycycline showed significant reduction in glomerular area and cell proliferation than non-treated controls. Glomerular deposition of immunoglobulin (Ig)G and C3 was less intense in treated rats than non-treated controls. Although not statistically significant, interstitial inflammation was less intense in treated rats than non-treated controls. Glomerular expression of MMP-9 by immunoflourescence was significantly inhibited in the treated group. In addition pro-MMP-2 on gelatin zymography was importantly suppressed by doxycycline in ICN.
Conclusion:
Doxycycline, in addition to its antibiotic property, may, following further investigation, provide a possible survival benefit in proliferative glomerulonephritis.
Insights
Doxycycline treatment reduced kidney damage and inflammation in a rat model of immune-complex nephritis. This matrix metalloproteinase inhibitor shows potential for treating proliferative glomerulonephritis.
Area of Science:
- Nephrology
- Immunology
- Pharmacology
Background:
- Matrix metalloproteinases (MMP) and their inhibitors (TIMP) play a role in tubulointerstitial fibrosis in progressive glomerulonephritis (GN).
- Immune-complex nephritis (ICN) is a form of GN characterized by inflammation and potential fibrosis.
Purpose of the Study:
- To evaluate the therapeutic efficacy of doxycycline, an MMP inhibitor, in an experimental rat model of immune-complex nephritis (ICN).
Main Methods:
- Immune-complex glomerulonephritis was induced in rats via bovine serum albumin (BSA) administration.
- Rats received daily doxycycline (30 mg/kg) or a placebo for 28 days.
- Kidney tissue analysis included glomerular morphology, immunoglobulin and C3 deposition, interstitial inflammation, and MMP expression (MMP-9, pro-MMP-2).
Main Results:
- Doxycycline treatment significantly reduced glomerular area and cell proliferation compared to controls.
- Treated rats exhibited less intense glomerular IgG and C3 deposition.
- Glomerular MMP-9 expression and pro-MMP-2 levels were significantly suppressed by doxycycline in ICN rats.
Conclusions:
- Doxycycline demonstrated a therapeutic effect in reducing key pathological features of immune-complex nephritis in rats.
- Beyond its antibiotic properties, doxycycline may offer a survival benefit in proliferative glomerulonephritis, warranting further investigation.
