Therapeutic regimens and methods for improving visual function in visual disorders associated with an endogenous retinoid deficiency
Disclosed herein are therapeutic regimens for improving visual function in Retinitis Pigmentosa and other visual disorders associated with an endogenous retinoid deficiency in a subject by administering a therapeutically effective amount of a synthetic retinal derivative, for example a 9- or 11-cis retinyl ester, according to the therapeutic regimen which leads to local recovery of visual functions such as visual fields, visual acuity and retinal sensitivity, among others.
1. A method of improving visual function in a subject having a deficiency in endogenously produced 11-cis retinal comprising:
a. administering a first therapeutic dose of a synthetic retinal derivative orally to a subject in need thereof, wherein the first therapeutic dose is administered as a daily dose over a period of 7 days;
b. providing a resting period of from 14 to 21 days; and
c. administering a second therapeutic dose of the synthetic retinal derivative to said subject following the end of the resting period.
2. The method of claim 1 , wherein the subject has retinitis pigmentosa (RP).
3. The method of claim 1 , wherein the subject has Leber congenital amaurosis (LCA).
4. The method of claim 1 , wherein the subject has an LRAT gene mutation.
5. The method of claim 1 , wherein the subject has a RPE65 gene mutation.
6. The method of claim 1 , wherein the synthetic retinal derivative provides replacement of endogenously produced 11-cis-retinal.
7. The method of claim 1 , wherein the method further comprises repeating steps b and c one or more times.
8. The method of claim 1 , wherein the synthetic retinal derivative is a 9-cis-retinyl ester.
9. The method of claim 8 , wherein the retinyl ester is 9-cis-retinyl acetate.
10. A dosing regimen for improving visual function of a subject having a deficiency in endogenously produced 11-cis retinal, wherein the dosing regimen comprises at least, a first therapeutic dose, a second therapeutic dose and a resting period between the first therapeutic dose and the second therapeutic dose, the regimen comprising;
a. daily administering a first oral dose of a 9- or 11-cis-retinyl ester over a period of 7 days to a subject in need thereof;
b. providing a resting period of from 14 to about 21 days between the first therapeutic dose and the second therapeutic dose; and
c. administering the second oral therapeutic dose of a 9- or 11-cis-retinyl ester following the end of the resting period to the subject in need thereof.
11. The dosing regimen of claim 10 , wherein the subject has Leber congenital Amaurosis (LCA).
12. The dosing regimen of claim 10 , wherein the method further comprises repeating steps b and c one or more times.
13. The dosing regimen of claim 10 , wherein the first therapeutic dose is from about 280 mg/m 2 to about 420 mg/m2.
14. The dosing regimen of claim 10 , wherein the retinyl ester is 9-cis-retinyl acetate.
15. The method of claim 9 , wherein the resting period is 21 days.
16. The dosing regimen of claim 14 , wherein the resting period is 21 days.