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Endocrine expression of the active form of TGF-beta1 in the TGF-beta1 null mice fails to ameliorate lethal phenotype

Glenn Longenecker1, Tamizchelvi Thyagarajan, Chandrasekharam N Nagineni

  • 1Functional Genomics Unit and Gene Targeting Facility, National Institute of Dental and Craniofacial Research, Bethesda, MD 20892, USA.

Cytokine
|July 2, 2002
PubMed

Insights

Transforming growth factor-beta1 (TGF-beta1) null mice exhibit lethal autoimmune inflammation. Circulating TGF-beta1 partially reduced inflammation but failed to rescue lethality, highlighting TGF-beta1

Area of Science:

  • Immunology
  • Genetics
  • Molecular Biology

Background:

  • Transforming growth factor-beta1 (TGF-beta1) null mice (TGF-beta1-/-) die prematurely due to severe autoimmune-mediated inflammation and multi-organ failure.
  • Understanding the role of circulating versus locally produced TGF-beta1 is crucial for therapeutic strategies.

Purpose of the Study:

  • To investigate the therapeutic potential of systemically circulating active TGF-beta1 in a TGF-beta1 null mouse model.
  • To differentiate the roles of endocrine (circulating) and autocrine (local) TGF-beta1 in mitigating autoimmune disease.

Main Methods:

  • Generation of TGF-beta1 null mice with hepatic (liver) expression of active TGF-beta1 (TGF-beta1 -/-/TG).
  • Crossbreeding TGF-beta1+/- mice with transgenic mice (TG) expressing recombinant TGF-beta1 in the liver.
  • Analysis of survival rates, serum TGF-beta1 levels, tissue inflammation (histopathology), and kidney pathology (glomerulonephritis).

Main Results:

  • TGF-beta1 (-/-) mice exhibit lethal autoimmune inflammation and die by 3-4 weeks.
  • TGF-beta1 (-/-/TG) mice showed restored serum TGF-beta1 levels and reduced inflammation in target organs like the heart.
  • Despite reduced inflammation, TGF-beta1 (-/-/TG) mice did not survive, indicating a failure to rescue the lethal phenotype, and developed glomerulonephritis, similar to TG mice.

Conclusions:

  • Circulating active TGF-beta1 has a role in reducing systemic inflammation, particularly in organs like the heart.
  • The inability of circulating TGF-beta1 to rescue lethality in TGF-beta1 null mice underscores a critical, non-redundant autocrine role for TGF-beta1.
  • This model highlights the complex interplay between local and systemic TGF-beta1 in immune regulation and disease pathogenesis.

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