Ten-Eleven Translocation 1 and 2 Enzymes Affect Human Skin Fibroblasts in an Age-Related Manner

Area of Science:

• Epigenetics and Molecular Biology
• Cellular Biology
• Aging Research

Background:

• Ten-eleven translocation (TET) enzymes are crucial for DNA demethylation, converting 5-methylcytosine (5mC) to downstream oxidized forms.
• Altered TET enzyme expression is implicated in cellular dysfunction and aging phenotypes.
• Fibroblast function is critical for tissue integrity and repair, and its regulation by TET enzymes is of significant interest.

Purpose of the Study:

• To investigate the impact of Ten-eleven translocation 1 (TET1) and TET2 overexpression on fibroblast functions.
• To determine if the effects of TET1 and TET2 vary between fibroblasts from young and aged individuals.
• To assess the roles of TET enzymes in regulating cell proliferation, apoptosis, DNA damage repair, and autophagy.

Main Methods:

• Fibroblasts were isolated from young and age-advanced individuals.
• Overexpression of TET1 and TET2 was induced in these fibroblasts.
• Flow cytometry was utilized to assess proliferation, apoptosis, γH2AX (DNA double-strand break marker), Beclin 1 (autophagy marker), and Fibulin 5 expression.

Main Results:

• In young fibroblasts, TET1 and TET2 overexpression inhibited proliferation.
• In aged fibroblasts, TET1 and TET2 overexpression significantly inhibited proliferation and affected DNA repair markers (γH2AX) and autophagy (Beclin 1).
• TET2 overexpression in aged fibroblasts also increased Fibulin 5 expression, indicating age-dependent differential regulation of cellular processes.

Conclusions:

• TET1 and TET2 play significant roles in regulating fibroblast proliferation, apoptosis, and DNA repair mechanisms.
• The biological functions of TET enzymes in fibroblasts are demonstrably age-dependent.
• These findings highlight the complex involvement of TET enzymes in cellular aging and function.