Date published: 2025-12-24

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CatSper2 Inhibitors

Chemical inhibitors of CatSper2 include a variety of compounds that indirectly inhibit the protein by altering the ionic environment essential for its function. Mibefradil, Verapamil, and Nifedipine are calcium channel blockers that decrease the influx of calcium ions. Since CatSper2 is a calcium channel that is activated by intracellular calcium, the reduction in calcium ions available in the vicinity of CatSper2 due to the action of these inhibitors would reduce its activity. Tetracaine and Lidocaine are local anesthetics that inhibit voltage-gated sodium channels, which are responsible for initiating action potentials that lead to an increase in intracellular calcium. By preventing these action potentials, these compounds indirectly prevent the activation of CatSper2, which is dependent on these calcium signals. Furthermore, Amiloride adjusts intracellular pH by modulating sodium/hydrogen exchangers, thereby affecting CatSper2, which is sensitive to pH changes. Ketoconazole and Clotrimazole, through their inhibition of cytochrome P450 enzymes, may alter steroid hormone synthesis. As steroid hormones regulate CatSper2 channel functionality, these chemicals can thus indirectly inhibit CatSper2 activity. Hydrochlorothiazide, by affecting ion concentrations through its diuretic action, can alter calcium homeostasis, which is pivotal for CatSper2 activity.
Product NameCAS #Catalog #QUANTITYPriceCitationsRATING

Mibefradil dihydrochloride

116666-63-8sc-204083
sc-204083A
10 mg
50 mg
$209.00
$848.00
4
(1)

Mibefradil blocks T-type calcium channels, which can indirectly inhibit CatSper2 by altering the calcium influx necessary for CatSper2 channel function in sperm.

Verapamil

52-53-9sc-507373
1 g
$367.00
(0)

Verapamil is an L-type calcium channel blocker that could reduce the overall calcium levels impacting CatSper channels due to the interconnectedness of calcium homeostasis.

Nifedipine

21829-25-4sc-3589
sc-3589A
1 g
5 g
$58.00
$170.00
15
(1)

Nifedipine, another calcium channel blocker, can indirectly inhibit CatSper2 by reducing calcium entry through L-type channels, which can lower intracellular calcium concentration required for CatSper2 activity.

Tetracaine

94-24-6sc-255645
sc-255645A
sc-255645B
sc-255645C
sc-255645D
sc-255645E
5 g
25 g
100 g
500 g
1 kg
5 kg
$66.00
$309.00
$500.00
$1000.00
$1503.00
$5000.00
(0)

Tetracaine is a local anesthetic that blocks voltage-gated sodium channels, potentially reducing the action potentials necessary for calcium influx affecting CatSper2 activity.

Amiloride

2609-46-3sc-337527
1 g
$290.00
7
(1)

Amiloride indirectly inhibits CatSper2 by modulating the sodium/hydrogen exchanger and thus altering intracellular pH, which is a known regulator of CatSper channel function.

Ketoconazole

65277-42-1sc-200496
sc-200496A
50 mg
500 mg
$62.00
$260.00
21
(1)

Ketoconazole inhibits cytochrome P450 enzymes, which may indirectly affect the steroid hormone synthesis that regulates CatSper2 channel functionality.

Clotrimazole

23593-75-1sc-3583
sc-3583A
100 mg
1 g
$41.00
$56.00
6
(2)

Clotrimazole, known to inhibit cytochrome P450 enzymes and Ca2+-activated K+ channels, could alter the calcium and potassium ionic environment, impacting CatSper2 activity.

Hydrochlorothiazide

58-93-5sc-207738
sc-207738A
sc-207738B
sc-207738C
sc-207738D
5 g
25 g
50 g
100 g
250 g
$54.00
$235.00
$326.00
$551.00
$969.00
(0)

Hydrochlorothiazide, a diuretic, can affect ion concentrations, especially Ca2+ homeostasis, which in turn can indirectly inhibit CatSper2 by altering its ionic operating environment.

Lidocaine

137-58-6sc-204056
sc-204056A
50 mg
1 g
$50.00
$128.00
(0)

Lidocaine blocks voltage-gated sodium channels, which could diminish the depolarization required for optimal CatSper2 channel functioning.

Flufenamic acid

530-78-9sc-205699
sc-205699A
sc-205699B
sc-205699C
10 g
50 g
100 g
250 g
$26.00
$77.00
$151.00
$303.00
1
(1)

Flufenamic acid is another NSAID that can block other Ca2+ channels, potentially affecting intracellular Ca2+ levels and indirectly inhibiting CatSper2.