Cosmetic and/or pharmaceutical composition comprising a peptidic hydrolyzate that can reinforce the barrier function

1. A peptidic hydrolyzate comprising: one or more bioactive peptide each with a molecular weight of less than 6 kDa, each bioactive peptide or combination thereof reinforcing the barrier function of the epidermis, said bioactive peptide comprising 4 to 6 amino acids comprising at least one glycine residue, one leucine residue, and one glutamic acid residue, wherein said peptidic hydrolyzate is isolated from the hydrolysis of plants selected from the group consisting of einkorn ( Triticum monococum ), potato ( Solanum tuberosum ), corn ( Zea mayz L.), pea ( Pisum sativum ) or from the hydrolysis of yeasts of the Saccharomyces genus.

2. The peptidic hydrolyzate according to claim 1 , wherein said bioactive peptide is of general formula (I)

X 1 -[Gly,Glu,Leu]-X 2 -X 3

in which,

X 1 is alanine, valine, isoleucine or absent,

X 2 is serine or threonine,

X 3 is leucine, isoleucine or absent.

3. The peptidic hydrolyzate according to claim 2 , wherein said bioactive peptide is one of the following sequences:

(SEQ ID NO: 1)

Ala-Glu-Gly-Leu-Ser-Ile,

(SEQ ID NO: 2)

Leu-Gly-Glu-Ser-Leu,

(SEQ ID NO: 3)

Val-Gly-Glu-Leu-Thr,

(SEQ ID NO: 4)

Ile-Gly-Glu-Leu-Ser,

(SEQ ID NO: 5)

Ala-Gly-Glu-Leu-Ser,

(SEQ ID NO: 6)

Gly-Glu-Leu-Thr-Ile,

and

(SEQ ID NO: 7)

Gly-Glu-Leu-Ser.

4. The peptidic hydrolyzate according to claim 1 , wherein said peptidic hydrolyzate contains between 0.5 and 5.5 g/l of the bioactive peptide.

5. A cosmetic composition comprising:

a physiologically acceptable medium; and

a peptidic hydrolyzate in said medium, the peptide hydrolyzate comprising one or more bioactive peptide each with a molecular weight of less than 6 kDa, each bioactive peptide or combination thereof reinforcing the barrier function of the epidermis, said bioactive peptide comprising 4 to 6 amino acids comprising at least one glycine residue, one leucine residue, and one glutamic acid residue, said peptidic hydrolyzate is isolated from the hydrolysis of plants selected from the group consisting of einkorn ( Triticum monococum ), potato ( Solanum tuberosum ), corn ( Zea mayz L.), pea ( Pisum sativum ) or from the hydrolysis of yeasts of the Saccharomyces genus; wherein the peptidic hydrolyzate is present in a quantity representing from 0.0001% to 20% of the total weight of the composition.

6. The composition according to claim 5 , wherein said peptidic hydrolyzate is solubilized in one or more physiologically acceptable solvents selected from the group consisting of water, glycerol, ethanol, propylene glycol, butylene glycol, dipropylene glycol, ethoxylated or propoxylated diglycols, cyclic polyols, white petroleum jelly, vegetable oil, and combinations thereof.

7. The composition according to claim 5 , wherein the composition is present in a form suitable for topical application.

8. The composition according to claim 5 , wherein the composition further comprises at least one other active principle agent promoting the action of said peptidic hydrolyzate selected from the group consisting of vitamin C, vitamin E, coenzyme Q10, polyphenolic plant extracts, retinoids, the peptide of sequence Gly-Pro-Gln-Gly-Pro-Gln (SEQ ID NO: 8), the Artemia extract, and combinations thereof.

9. A cosmetic composition comprising:

an effective quantity of a peptidic hydrolyzate as an active principle activating 3-hydroxy-3-methylglutaryl-Coenzyme A (HMG-CoA) reductase, said peptidic hydrolyzate comprising a bioactive peptide reinforcing the barrier function of the epidermis, said bioactive peptide containing 4 to 6 amino acids including at least one glycine residue, one leucine residue, and one glutamic acid residue.

10. A method for treating the cutaneous manifestations of aging and/or photo-aging, the method comprising:

providing a composition comprising an effective quantity of a peptidic hydrolyzate, said peptidic hydrolyzate comprising one or more bioactive peptide each with a molecular weight of less than 6 kDa, each bioactive peptide or combination thereof reinforcing the barrier function of the epidermis, said bioactive peptide comprising 4 to 6 amino acids comprising at least one glycine residue, one leucine residue, and one glutamic acid residue wherein said peptidic hydrolyzate is isolated from the hydrolysis of plants selected from the group consisting of einkorn ( Triticum monococum ), potato ( Solanum tuberosum ), corn ( Zea mayz L.), pea ( Pisum sativum ) or from the hydrolysis of yeasts of the Saccharomyces genus; and

topically applying the composition to the skin or epithelial appendages to be treated.

11. The peptidic hydrolyzate according to claim 1 , wherein the hydrolysis of yeasts is of the Saccharomyces cerevisiae species.

12. The cosmetic composition of claim 5 , wherein the peptidic hydrolyzate is present in a quantity representing from 0.05% to 5% of the total weight of the composition.

13. A method for reinforcing the barrier function of the epidermis, the method comprising:

providing a composition comprising a peptidic hydrolyzate isolated from the hydrolysis of plants selected from the group consisting of einkorn ( Triticum monococum ), potato ( Solanum tuberosum ), corn ( Zea mayz L.), pea ( Pisum sativum ), soy ( Glycine Max . L.), or yeast ( Saccharomyces cerevisiae ), said peptidic hydrolyzate comprising one or more bioactive peptide each with a molecular weight of less than 6 kDa, each bioactive peptide or combination thereof comprising 4 to 6 amino acids comprising at least one glycine residue, one leucine residue, and one glutamic acid residue; as an active principle activating HMG-CoA reductase; and

topically applying the composition to the skin or epithelial appendages to be treated.

14. The method of claim 10 , wherein topically applying includes the application of the cosmetic composition to the skin before exposure to an external stress.

15. The method of claim 14 , wherein the external stress is selected from the group consisting of ultraviolet (UV) radiation, dryness of the atmosphere, or mechanical stresses chosen from abrasions, shaving, epilation, and combinations thereof.

16. The method of claim 10 , wherein topically applying includes the application of the cosmetic composition to the skin after exposure to an external stress.

17. The method of claim 16 , wherein the external stress is selected from the group consisting of ultraviolet (UV) radiation, dryness of the atmosphere, or mechanical stresses chosen from abrasions, shaving, epilation, and combinations thereof.

18. The method according to claim 13 , wherein reinforcing the barrier function of the epidermis includes stimulating epidermal differentiation.