L-Thyroxine is a synthetic form of thyroxine and a hormone replacement compound. L-Thyroxine (T4) and Triiodothyronine (T3) hormones are known to modulate the expression of ionic channels, pumps and regulatory contractile proteins. Moreover, thyroid hormones have been shown to influence calcium homeostasis and flux responsible for excitation and contractility, with L-Thyroxine and Triiodothyronine modulating its pharmacological control and secretion. In rats fed 12 weeks with the iodine-free diet, a significant decrease in the levels of both Triiodothyronine and L-Thyroxine is observed when compared to the control group fed with standard diet (p<0.001). In the group treated with low doses of L-Thyroxine, an increase in L-Thyroxine levels is observed (p=0.02) while Triiodothyronine levels remain virtually similar to the control group (p=0.19).
| Molecular Weight | 776.87 |
| Formula | C15H11I4NO4 |
| CAS Number | 51-48-9 |
| Solubility (25°C) | DMSO ≥ 100 mg/mL |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
| Species | Mouse | Rat | Rabbit | Guinea pig | Hamster | Dog |
| Weight (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
| Body Surface Area (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
| Km factor | 3 | 6 | 12 | 8 | 5 | 20 |
| Animal A (mg/kg) = Animal B (mg/kg) multiplied by | Animal B Km |
| Animal A Km |
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
| Related Metabolite/Endogenous Metabolite Products |
|---|
| 2,3-Dihydroxyisovaleric acid
2,3-Dihydroxyisovaleric acid is a natural metabolite of the branched-chain amino acid leucine. It acts by activating the mTOR signaling pathway to promote the synthesis of new muscle proteins and reduce the breakdown of existing proteins. |
| Ursocholic acid
Ursocholic acid is a bile acid found predominantly in bile of mammals, which can be transformed into deoxycholic acid by the intestinal microflora in mice. |
| 5β-Cholanic acid
5β-Cholanic acid can be used for 5β-Cholanic acid derivatives synthesis. |
| D-Thyroxine
D-Thyroxine is a thyroid hormone that can inhibit TSH secretion. D-Thyroxine can be used for the research of hypercholesterolemia. |
| Allolithocholic acid
Allolithocholic acid is a steroid acid could found in normal serum and feces. Allolithocholic acid facilitates excretion, absorption, and transport of fats and sterols in the intestine and liver. |
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