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Expression of transforming growth factor beta isoforms and their receptors during hair growth phases in mice
1Department of Dermatology, Friedrich-Schiller-University of Jena, Germany.
Abstract:
Transforming growth factor beta (TGF-beta) is a family of potent growth inhibitor proteins, often produced as a precursor and often secreted in a complex with the latent TGF-beta binding protein (LTBP). We investigated the expression of TGF-beta 1, -beta 2, -beta 3, LTBP, TGF-beta receptor proteins type I and type II (T beta R-I and -II) during induced hair growth in C57 BL-6 mice. We here demonstrated that TGF betas and T beta R-I are expressed in hair follicle epithelium and have found a positive reactivity for LTBP and T beta R-I in ++sebocytes. Dermal tissue was weakly stained for LTBP and TGF-beta 3. In early anagen the inner hair root sheath epithelium expressed TGF-beta 1, whereas outer hair root was positive for T beta R-I during anagen/catagen switch. T beta R-II was found in sebaceous glands without significant variations during the hair cycle. We may conclude that in follicle epithelium TGF-beta 1 is not produced in a complex together with LTBP. On the other hand, it is possible that other types of LTBP, like LTBP-2 and LTBP-3, are present, which are not detected by the antibody we used. Furthermore, a very rapid secretion of LTBP from producing cells may prevent immunohistochemical detection. TGF-beta 1 released by inner hair root sheath may regulate outer root sheath growth. A bidirectional interaction of sebocytes and hair follicle epithelium in the TGF-beta/LTBP seems possible. Sebocytes can be considered to be a target for TGFs since they express both T beta R++-I and -II. The general properties of TGF-beta as a growth inhibitor of epithelial cells may suggest a possible involvement in either the abrogation of extensive growth at the end of anagen or the initiation of catagen for the follicle epithelium as well as growth control for sebaceous glands.
Insights
Transforming growth factor beta (TGF-beta) and its binding proteins are expressed in mouse hair follicles, suggesting a role in regulating hair growth cycles and sebaceous gland activity.
Area of Science:
- Molecular Biology
- Dermatology
- Cell Biology
Background:
- Transforming growth factor beta (TGF-beta) is a family of growth inhibitors.
- TGF-beta proteins are often secreted with latent TGF-beta binding proteins (LTBPs).
- Understanding TGF-beta signaling in hair follicle biology is crucial for hair growth research.
Purpose of the Study:
- To investigate the expression of TGF-beta isoforms, LTBP, and TGF-beta receptors during induced hair growth in mice.
- To elucidate the potential roles of TGF-beta signaling in hair follicle epithelium and sebaceous glands.
Main Methods:
- Immunohistochemical analysis of TGF-beta 1, -beta 2, -beta 3, LTBP, TGF-beta receptor type I (T beta R-I), and type II (T beta R-II) expression.
- Study conducted during induced hair growth in C57 BL-6 mice.
- Analysis focused on hair follicle epithelium, outer and inner root sheath, and sebaceous glands.
Main Results:
- TGF-betas and T beta R-I were expressed in hair follicle epithelium; LTBP and T beta R-I showed reactivity in sebocytes.
- TGF-beta 1 was expressed in the inner hair root sheath during early anagen, while T beta R-I was present in the outer hair root during the anagen/catagen switch.
- T beta R-II was found in sebaceous glands, with no significant changes during the hair cycle.
Conclusions:
- TGF-beta 1 in the follicle epithelium may not form a complex with LTBP, suggesting potential involvement of other LTBP types or rapid LTBP secretion.
- TGF-beta 1 from the inner hair root sheath might regulate outer root sheath growth.
- A bidirectional interaction between sebocytes and hair follicle epithelium via TGF-beta/LTBP signaling is plausible, with sebocytes acting as targets.