Peptide for promoting hair growth

Abstract

The present invention provides a peptide consisting of an amino acid sequence of SEQ ID NO: 1. Also provided is a method for promoting proliferation of a dermal papilla cell by incubating the cell with the peptide. Further provided is a method for promoting growth of a hair follicle in a skin by applying the peptide to the skin. Still provided is a method for preventing hair loss of a subject by administering the peptide to the subject. Yet further provided is a method for promoting hair growth of a subject by administering the peptide to the subject.

Claims

1. A method for promoting proliferation of a dermal papilla cell, comprising: incubating the dermal papilla cell with a peptide consisting of the amino acid sequence of SEQ ID NO: 1.

2. The method as claimed in claim 1, wherein the peptide is formulated in a liquid form, a block form, a powder form, a gel form, or a foam form.

3. A method for promoting growth of a hair follicle in a skin, comprising: applying a peptide consisting of the amino acid sequence of SEQ ID NO: 1 to the skin.

4. The method as claimed in claim 3, wherein the peptide is formulated in a liquid form, a block form, a powder form, a gel form, or a foam form.

5. A method for promoting hair growth of a subject, comprising: applying a peptide consisting of the amino acid sequence of SEQ ID NO: 1 to the skin of the subject.

6. The method as claimed in claim 5, wherein the peptide is formulated in a liquid form, a block form, a powder form, a gel form, or a foam form.

7. The method as claimed in claim 5, wherein the peptide is formulated in a cosmetic or an external medicine.

8. The method as claimed in claim 7, wherein the cosmetic is a shampoo, a hair conditioner, a hair styling agent, a mascara, or a pet shampoo.

9. The method as claimed in claim 7, wherein the external medicine is a lotion, a cream, a gel, an oil, an ointment, a salve, an emulsion, a solution, or a suspension.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a bar graph illustrating the cell proliferation at the 48th hour or 96th hour after treatment;

(2) FIG. 2 is a microscopic picture showing hair shaft growth on the 20th day after treatment;

(3) FIG. 3 is a statistical graph illustrating hair shaft lengths on the 20th day after treatment;

(4) FIG. 4 is a microscopic picture showing hair growth of nude mice on the 30th day after injection; and

(5) FIG. 5 is a microscopic picture showing hair follicles of nude mice on the 30th day after injection.

DETAILED DESCRIPTION OF THE INVENTION

(6) The detailed description and preferred embodiments of the invention will be set forth in the following content, and provided for people skilled in the art so as to understand the characteristics of the invention.

Example 1

Peptide Preparation

(7) Mucinhair peptide (sequence: NTSDPQKENRNTG) was synthesized by MDBio, Inc. (Taipei, Taiwan), and its purity (>75%) and composition were determined with high performance liquid chromatography (HPLC) and mass spectrometry (MS). Peptide stock was prepared by dissolving 10 mg of lyophilized peptide powder in 1 mL of double deionized water (ddH.sub.2O), and then stored at 20 C.

Example 2

Isolation of Dermal Papilla Cells

(8) Dermal papilla cells were isolated from rat whiskers and cells were cultured in Dulbecco's modified Eagle's medium (Thermo Scientific, Barrington, Ill., USA) with 10% fetal bovine serum (Gibco, Grand Island, N.Y., USA) and penicillin/streptomycin (100 IU/50 g/ml) in a humidified atmosphere containing 5% CO.sub.2 at 37 C. Dermal papilla cells at the 3rd passage were used for all of the following experiments.

Example 3

Cell Proliferation Assay

(9) 210.sup.3 dermal papilla cells were seeded in 96-well plates and incubated with Mucinhair peptide (50 g/ml) or ddH.sub.2O for the indicated period. 10 L of 5 mg/mL 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide solution (MTT; Sigma) was added to each well and incubated at 37 C. for 4 hours. After which, 100 L of 10% SDS in 0.01N HCl was added to dissolve the MTT formazan crystals. The resultant optical density was measured spectrophotometrically at dual wavelengths, 550 and 630 nm. The MTT value was obtained by subtracting the OD.sub.630 value from the OD.sub.550 value.

(10) The term proliferation rate used herein is defined as a quotient of the MTT value calculated from cells treated for an indicated period and that calculated from cells treated for 0 hour. As shown in FIG. 1, the proliferation rate of cells treated with ddH.sub.2O for 48 hours is 1.770.12; the proliferation rate of cells treated with Mucinhair peptide for 48 hours is 2.260.23; the proliferation rate of cells treated with ddH.sub.2O for 96 hours is 2.680.20; the proliferation rate of cells treated with Mucinhair peptide for 96 hours is 3.310.21.

(11) As above, Mucinhair peptide has ability to promote dermal papilla cell proliferation.

Example 4

Hair Follicle Culture

(12) Hair follicles were isolated from 4 week-old rat whiskers and were maintained in Dulbecco's Modified Eagle Medium supplemented with 10% fetal bovine serum, 1% (v/v) antibiotic, and 250 ng/ml fungizone in 5% CO.sub.2 at 37 C. for 24 hours. Then, the hair follicles were treated with ddH.sub.2O or Mucinhair peptide (50 g/ml). Medium was changed every 6 days and the hair shaft lengths were measured under a phase contrast microscope on the 20th day after the treatment. As shown in FIGS. 2 and 3, the hair shafts grown with Mucinhair peptide treatment are longer than those grown with ddH.sub.2O treatment.

(13) As above, Mucinhair peptide has ability to promote hair shaft elongation.

Example 5

Isolation of Epidermal Cells and Dermal Cells

(14) Skin was peeled off from 1 day-old C57BL/6 mouse and its epidermis was separated from the dermis by 10 mg/ml Dispase digestion at 4 C. for 2 days. Epidermis and dermis were cut into small pieces and digested at 37 C. in 0.05% Trypsin-EDTA for 15 minutes and then 20 mg/ml collagenase for 60 minutes. Epidermal cells and dermal cells were collected through filtration with 70 m strainers and low-speed centrifugation.

Example 6

Hair Patch Assay for Nude Mice

(15) 210.sup.7 epidermal cells and 110.sup.8 dermal cells were subcutaneously injected into nude mice with ddH.sub.2O or Mucinhair peptide (50 g/ml). After 30 days, mice were sacrificed and hair patch was excised and photographed. The excised skins were paraffin-embedded and tissues were sectioned and stained with hemmtoxylin and eosin (H&E).

(16) As shown in FIG. 4, what each arrow indicates is the region with hairs. Obviously, the region with hairs of nude mice injected with Mucinhair peptide is larger than that injected with ddH.sub.2O. As further shown in FIG. 5, the hypodermis of nude mice injected with Mucinhair peptide has neogenic hair follicles.

(17) As above, Mucinhair peptide has ability to promote hair follicle growth and hair growth in vivo.

(18) While the invention has been described in connection with what is considered the most practical and preferred embodiment, it is understood that this invention is not limited to the disclosed embodiment but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.