PLX5622 in AIN-76A Diet (1200 ppm)

The survival of microglia depends on the CSF1R signaling pathway. Clearing microglia at different times and spaces (before, during, or after injury or disease) will have different impacts on the development, homeostasis, and diseases of the central nervous system. Therefore, the pharmacological manipulation of microglia using CSF1Ri (CSF1R inhibitor) can provide insights into brain functions.
In many peer-reviewed publications, PLX5622 is most commonly administered via ad libitum feeding. Consequently, the validation studies of PLX5622 performed by MedChemExpress (MCE) were conducted by providing mice with AIN-76A diets supplemented with PLX5622.
The PLX5622-supplemented AIN-76A diet (1200 ppm) provided by MCE is blue in color. Concurrently, MCE supplies an equivalent quantity of PLX5622-free AIN-76A diet (no added pigments) as a complementary provision, which serves as the control group diet.

Precautions for the Use of PLX5622 in AIN-76A Diet (1200 ppm)
1. Sampling on the day when the experiment ends:
The literature (Cell. 2020 Mar 5;180(5):833-846.e16.) indicate that there are significant differences in the detected IBA1⁺ signals when sampling is done 6 hours later and 3 days later.
2. Optimal usage period:
(2.1) It is recommended to use up the feed within half a year when stored at -20°C (to ensure the palatability of the feed). It is advisable to reduce repeated freezing and thawing. The diet required during the experiment can be stored at 4°C and should be used up during the experiment.
(2.2) Store the diet away from light. After each feeding of the mice, make every effort to expel as much air as possible from the feed bag and seal it tightly.
3. Calculate the feed consumption:
For mice weighing 20-25 g, the daily feed consumption is approximately 4 g. It is recommended to calculate the feed consumption of the mice and replace and add the feed every 1-2 days. Do Not provide a large amount of feed to the mice at one time without replacing it during the experiment.
4. Concerning self-prepared feed consumption: During the feed synthesis process, approximately 10% loss of both the feed base material and the drug may occur.

5. About rat administration: Current research on PLX5622 has primarily focused on mouse models, with limited data available for rat applications. Its microglial depletion efficiency exhibits significant species-, sex-, brain region-, and administration route-dependent variability. In the literature, the depletion efficacy of diet-based administration in rats has been inconsistently reported, whereas intraperitoneal injection (50 mg/kg, twice daily for 14 consecutive days) has been shown to achieve >90% microglial clearance in adult rats. In light of these discrepancies, we recommend conducting a pilot study prior to formal experiments in rats to determine the optimal dosing regimen tailored to your specific experimental system^[1][2][3][4].
Other questions about PLX5622 Diet:
Q1: Does γ-ray irradiation affect the product’s bioactivity?
A1: The primary objective of γ-ray irradiation is to ensure the feed’s suitability for use in Specific Pathogen Free (SPF)-level animal barrier facilities. Under a reasonable irradiation dose, it does not impact the activity of small-molecule compounds. However, γ-ray irradiation may disrupt fat chains, alter the feed’s original odor, reduce palatability, and cause partial loss of amino acids and vitamins in the nutritional components. Prompt use of the feed is recommended.
Q2: Can I prepare the custom diet myself?
A2: The critical aspect of feed preparation is the uniformity of drug distribution during the feed-stirring process. MCE ensures batch-to-batch homogeneity of the feed and guarantees that PLX5622 is uniformly mixed in the AIN-76A diet.
Q3: How should the diet be changed?
A3: As custom diets typically have slightly lower palatability than conventional diets, improper diet transition may result in animal anorexia and reduced feed intake. A diet transition via pre-feeding fasting is recommended. Specifically, experimental animals should be fasted for 24 hours before the custom diet is introduced.