Nonhormonal Unisex Contraceptives

Abstract

Nonhormonal unisex contraceptive products, compositions, formulations and methods of use comprise an effective amount of a targeted mild mitochondria uncoupler.

Claims

1. A method of promoting contraception, comprising administering to a person in need thereof a composition comprising an effective amount of a targeted mild mitochondria uncoupler.

2. The method of claim 1 wherein the uncoupler comprises a salicylanilide or salt thereof, such as an ethanolamine salt thereof, such as niclosamide ethanolamine (NEN).

3. The method of claim 1 wherein the uncoupler comprises a salicylanilide compound or salt thereof, and the salicylanilide compound is selected from: niclosamide, bromochlorosalicylanilide, oxyclozanide, rafoxanide, 3-tert-butyl-5-chloro-N-(2-chloro-4-nitrophenyl)-2-hydroxy-6-methylbenzamide, dibromsalan, metabromsalan, tribromsalan, and 2-iodo-N-phenylbenzamide (benodanil).

4. The method of claim 1 wherein the uncoupler comprises a salicylanilide compound or salt thereof, and the salicylanilide compound has a structure: ##STR00003## wherein R1 and R2 are independently halide, such as F, Cl, Br or I, substituted heteroatom selected from 0 and N, such as —OH, —NO2 or O-Ph-Cl, or lower (C1-C4) alkyl, such as Me, Et, or t-butyl, m is an integer 1, 2, 3 or 4, and n is an integer 1, 2, 3, 4 or 5.

5. The method of claim 1 wherein the uncoupler comprises BAM15 (N5,N6-bis(2-Fluorophenyl)-[1,2,5]oxadiazolo[3,4-b]pyrazine-5,6-diamine), or salt thereof.

6. The method of claim 1 wherein the composition is administered via an oral route, a topical route, a rectal route, or a vaginal route.

7. The method of claim 1, wherein the composition is administered as a pill, a cream, a vaginal ring, a vaginal film or a patch.

8. The method of claim 6, wherein the composition is administered orally and wherein the composition is administered as a pill.

9. The method of claim 6, wherein the composition is administered topically and wherein the composition is administered as a cream or a patch.

10. The method of claim 6 wherein the composition is administered intravaginally and wherein the composition is administered as a cream, a patch, a vaginal ring or a vaginal film.

11. The method of claim 6 wherein the composition is administered intrarectally and wherein the composition is administered as a cream or a patch.

12. Use of a targeted mild mitochondria uncoupler as a contraceptive.

13. The use of claim 12, wherein the uncoupler comprises a salicylanilide or salt thereof, such as an ethanolamine salt thereof, such as niclosamide ethanolamine (NEN).

14. The use of claim 12 wherein the uncoupler comprises a salicylanilide compound or salt thereof, and the salicylanilide compound is selected from: niclosamide, bromochlorosalicylanilide, oxyclozanide, rafoxanide, 3-tert-butyl-5-chloro-N-(2-chloro-4-nitrophenyl)-2-hydroxy-6-methylbenzamide, dibromsalan, metabromsalan, tribromsalan, and 2-iodo-N-phenylbenzamide (benodanil).

15. The use of claim 12 wherein the uncoupler comprises a salicylanilide compound or salt thereof, and the salicylanilide compound has a structure: ##STR00004## wherein R1 and R2 are independently halide, such as F, Cl, Br or I, substituted heteroatom selected from O and N, such as —OH, —NO2 or O-Ph-Cl, or lower (C1-C4) alkyl, such as Me, Et, or t-butyl, m is an integer 1, 2, 3 or 4, and n is an integer 1, 2, 3, 4 or 5.

16. The use of claim 12 wherein the uncoupler comprises BAM15 (N5,N6-bis(2-Fluorophenyl)-[1,2,5]oxadiazolo[3,4-b]pyrazine-5,6-diamine), or salt thereof.

17. The use of claim 12, wherein the composition is administered via an oral route, a topical route, a rectal route, or a vaginal route.

18. The use of claim 12, wherein the composition is administered as a pill, a cream, a vaginal ring, a vaginal film or a patch.

19. The use of claim 17, wherein the composition is administered orally and wherein the composition is administered as a pill; or the composition is administered topically and wherein the composition is administered as a cream or a patch; or the composition is administered intravaginally and wherein the composition is administered as a cream, a patch, a vaginal ring or a vaginal film; or the composition is administered intrarectally and wherein the composition is administered as a cream or a patch.

20. A contraceptive formulation comprising an effective amount of a targeted mild mitochondria uncoupler, preferably in the form of a pill, capsule, suppository, cream, vaginal ring, vaginal film or patch.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIGS. 1A-C is a series of schematic diagrams showing that the sperm cell relies on its mitochondria to generate energy. (A) General diagram of energy conversion within mitochondria. (B) The mechanism of mitochondrial ATP and heat production. Mitochondria have two membranes, the outer mitochondrial membrane (OMM, freely permeable to ions and small molecules <1500 Da) and the IMM (which has much more tightly controlled permeability and contains the apparatus for ATP and heat production). The electron transport chain (ETC) generates potential (ΔΨ) across the IMM, which is used by ATP synthase (AS) to produce ATP and H.sup.+ leak pathways to generate heat. Modified from.sup.1. (C) Spermatozoa rely on energy produced by their mitochondria that are tightly packed in the midpiece region of the tail. A proton gradient is established by the ETC to power the synthesis of ATP. In active swimming sperm cells, cellular ATP consumption causes active APT/ADP exchange via ANT that inhibits the ANT-mediated H.sup.+ leak, and ΔΨ is used to produce ATP only: (#1). When cellular activity is reduced, less ATP is consumed, leading to increases in ΔΨ and reactive oxygen species (ROS) production: (#2).sup.2,3. To prevent this from happening, proton leak through ANT increases, because now it is not inhibited by active ADP/ATP exchange (#3). This proton leak converts ΔΨ into heat, returning ΔΨ back to the normal value and decreasing ROS production. However, when ΔΨ is reduced by the proton leak, which is carried in sperm by ANT2 and ANT4, the mitochondria dissipate the energy in the form of heat and cannot produce enough ATP to power sperm motility.sup.12.

[0034] FIG. 2 is a series of chemical structures of mild mitochondrial uncouplers: Niclosamide, BAM15 and 2,4-dinitrophenol.

[0035] FIG. 3A-B is a pair of schematic diagrams depicting a mitochondrial patch-clamp. (A) Preparation of mitoplasts (vesicles of the whole IMM): (1) Isolation of mitochondria from cell lysate by centrifugation; (2) OMM removal using a low-pressure French press; (3) isolated mitoplasts in a KCl solution. Remnants of the OMM (arrow) are attached to the IMM. (B) Patch-clamp recording from mitoplasts. After formation of the gigaohm seal (mitoplast-attached configuration), the membrane patch under the pipette can be destroyed by high-amplitude voltage pulses to form a whole-mitoplast configuration for recording currents (I) across the whole IMM. Alternatively, the patch pipette can be withdrawn from the mitoplast to form an inside-out mode for recording single-channel activity.

[0036] FIG. 4 is a series of graphs (upper panels) and a schematic diagram (lower panel) showing regulators of ANT-mediated H.sup.+ current (I.sub.H). Left panel: I.sub.H activated by 2 μM arachidonic acid (AA) followed by a transient inhibition by 1 mM of bath ADP (2), and subsequent recovery (3). Control current is shown in black. Middle panel: I.sub.H time course of the left panel. Skeletal muscle mitoplast. I.sub.H amplitudes were measured upon stepping from 0 to −160 mV. Right panel: ADP inhibition of I.sub.H in points 2 and 3. Remaining I.sub.H measured at −160 mV is shown as a percentage of control, n=8. Explanation of transient I.sub.H inhibition by cytosolic adenine nucleotides. ANT in c-state, with fatty acid (FA) anion in the translocation pathway, mediates I.sub.H (I). Cytosolic ADP.sup.3− binds in c-state and expels FA anion/blocks translocation pathway, leading to I.sub.H inhibition (2). Upon ANT conformation change, ADP dissociates into matrix (pipette) solution (2 and 3). FA anion re-associates with ANT in m-state, restoring I.sub.H (4 and 5). Cytosolic ADP cannot inhibit I.sub.H while AAC is in m-state (5). Preliminary data from (Bertholet, A. M. Chouchani., E. T.; Kazak, L.; Angelin, A.; Fedorenko, A.; Long, J. Z.; Vidoni, S.; Garrity, R.; Cho, J.; Terada, N.; Wallace, D.C.; Spiegelman, B. M.; and Kirichok, Y. Proton Transport is an Integral Function of the Mitochondrial ADP/ATP Carrier Nature July; 571(7766):515-520 (2019)).

[0037] FIGS. 5A-B is a series of graphs demonstrating that ANT is required for H.sup.+ leak activated by FA and DNP. a, Representative currents induced by 2 μWI AA in WT and ANT1.sup.−/− mitoplasts of heart. Right panel: I.sub.H current densities at −160 mV for WT and ANT1.sup.−/− mitoplasts. b, Representative currents induced by 50 μM DNP in WT and ANT1.sup.−/− mitoplasts of heart. Right panel: I.sub.H current densities induced by 50 and 200 μM DNP at −160 mV in WT and ANT1.sup.−/− mitoplasts.

[0038] FIGS. 6A-C is a series of graphs demonstrating the impact of mitochondrial uncouplers (MU) on sperm physiology and fertilizing capacity. Niclosamide significantly decreases sperm motility, uncouples mitochondria and prevents fertilization. A) Human sperm were purified by swim-up method and their basal beat frequency (BF, in Hz) was measured as described in (Mannowetz, N., Naidoo, N. M., Choo, S. A., Smith, J. F. & Lishko, P. V. Slol is the principal potassium channel of human spermatozoa. eLife 2, e01009, doi:10.7554/eLife.01009 (2013)) in control HS solution ((1); in the presence of vehicle control ((2); DMSO), and in the presence of MU: 1 μM Niclosamide ethanolamine (NEN), 0.76 μM BAM15, and 5 μM DNP. Data are standard boxplots, with middle line representing median, upper and lower bounds of the box representing first and third quartiles, and whiskers representing maximum and minimum values, not including outliers. X's represent the mean of the sample, and dots represent individual data points. B) Human sperm mitochondrial membrane potential (MMP) assessment. Human sperm were incubated for 15 minutes in the presence of 0.1% DMSO (vehicle control), in the presence of 1 μM NEN or 0.75 μM BAM15. Samples from each condition (at least 100 of sperm midpieces per condition) were then assessed for fluorescence intensity measured with 45 nM MitoRed, which is a cell membrane permeable rhodamine-based dye. MitoRed localizes to mitochondria, and emits red fluorescence. The interaction of Mito Red with mitochondria depends on the membrane potential of the mitochondria. Uncoupled mitochondria emit less fluorescence. Data are standard boxplots, as in (A). C) Effect of sMU on human capacitated sperm hyperactivated motility. Cells were capacitated as described (11) for 4 hours. 4 μM Progesterone was added 2 minutes before imaging to trigger hyperactivation (HA). Cells were assessed as either Hyperactivated or Not Hyperactivated. N>45 cells. Error bars represent 95% CI calculated through the Wilson/Brown method.

DETAILED DESCRIPTION

[0039] Mitochondria generate ATP by coupling the H.sup.+ transport activities of the mitochondrial electron transport chain (ETC) and ATP synthase.sup.22, two gigantic transport protein complexes located in the inner mitochondrial membrane (IMM). Specifically, the ETC, fueled by high-energy electron donors provided by the Krebs cycle, pumps H.sup.+ out of the mitochondrial matrix to generate an electrochemical H.sup.+ gradient (ΔΨ) across the IMM. ATP synthase then returns H.sup.+ back into the mitochondrial matrix down the ΔΨ and uses the released energy to synthesize ATP from ADP and inorganic phosphate. To maximize the energy transfer between ETC and ATP synthase, the chemiosmotic theory postulated that the IMM conductance for H.sup.+ (and other ions) must be close to zero. However, it is now well-established that the IMM of any tissue is “leaky” for H. The H.sup.+ leak (I.sub.H) across the IMM is mediated by uncoupling proteins (UCPs). Similar to ATP synthase, UCPs return H.sup.+ back into the mitochondrial matrix down the ΔΨ, but do not generate ATP and instead dissipate the released energy as heat. This phenomenon, known as mitochondrial uncoupling, is crucial for mitochondrial function and integrity (FIG. 1). Free fatty acids (FA) are physiological activators of H.sup.+ leak via UCPs. Mitochondrial uncoupling in the specialized thermogenic tissues, brown and beige fat, helps to maintain core body temperature and control body weight.sup.3,23-25, and is happening via uncoupling protein 1 (UCP1) that is brown and beige fat-specific. In contrast to brown fat, mitochondria of regular somatic and reproductive tissues are only “mildly” uncoupled, which implies a smaller I.sub.H. However, because this mild uncoupling occurs in the majority of tissues, it may have a significant impact on thermogenesis, body weight, healthy metabolism and reproduction potential.sup.3,26.

[0040] In addition, the mild uncoupling reduces mitochondrial reactive oxygen species (ROS) production to preserve mitochondrial integrity.sup.12. The uncontrolled escape of electrons from the mitochondrial ETC to oxygen is the primary source of ROS in cells. The mild mitochondrial uncoupling that slightly reduces the potential across the IMM is a major mechanism that prevents ROS generation by ETC. Indeed, mild uncoupling was shown to be potentiated/activated by FA, ROS, and by hyperpolarized ΔΨ.sup.12,27. Despite the importance of mild mitochondrial uncoupling, the molecular identity of UCP(s) in all tissues except for brown fat remained elusive.

[0041] Therefore, chemical protonophores, such as 2,4-dinitrophenol (DNP), have been widely used to induce I.sub.H and mitochondrial uncoupling for research and therapeutic purposes. DNP is hydrophobic, membrane soluble weak acids that can carry H.sup.+ across biological membranes without the help of membrane transport proteins. What distinguishes them from FA (also hydrophobic weak acids, but poor protonophores) is the ability to diffuse through the membrane not only in the protonated form but also in the H.sup.+-free, negatively charged form. In accordance with the classic model, DNP, in the protonated form, carry H.sup.+ through the lipid bilayer to release it on the opposite side. Then, in the anionic form, they diffuse back across the membrane, bind another H.sup.+, and repeat the cycle. DNP was used to demonstrate that ΔΨ is essential for mitochondrial ATP production.sup.22,28, providing key evidence for the chemiosmotic theory. Later, DNP was shown to increase body energy expenditure and thermogenesis, while dramatically reducing fat deposition and body weight.sup.29. However, DNP has significant side effects in humans, and because it was considered a simple chemical protonophore without a protein target, efficiency and safety of DNP could not be improved.sup.29.

[0042] However, recent reports challenge the classic dogma that known mitochondrial uncouplers such as DNP act as a membrane protonophore.sup.2,30. These data strongly demonstrate that mild mitochondrial uncouplers induce the H.sup.+ leak by primarily interacting with Adenosine Nucleotide Transporter (ANT) proteins.

[0043] In humans and mice, the ANT protein has several isoforms that have a tissue-specific expression patterns with ANT4 being specifically expressed in the testis and sperm cells while completely repressed in other organs. It has been shown that ANT4-deficient male mice exhibit impaired spermatogenesis and are completely infertile.sup.13. It is important to note that these mice are viable and exhibit otherwise normal development and physiology.sup.13. ANT4 was previously proposed as a contraceptive target, and a drug screen.sup.14 was executed to look for compounds that inhibit ATP/ADP exchanger activity of ANT4; however, the lead compounds were found nonspecific as they have also inhibited other human ANT isoforms and therefore exhibited broad cytotoxicity.

[0044] The disclosure focuses on a completely different ANT transport modality—the ability to conduct protons and hence uncouple mitochondria in response to certain pharmacological intervention. Mild mitochondrial uncoupling is now recognized as a way to achieve weight loss, treat diabetes and even as an anticancer therapy.sup.15. Therefore, this ANT function is not expected to impose the cytotoxic effect on the targeted cells, but rather decrease their efficiency of ATP production.

[0045] In some embodiments of the disclosure, an ANT4 protein may comprise or consist of the amino acid sequence of ADP/APT translocase 4 (ANT4) (UniProtKB-Q9H0C2; also known as solute carrier family 25 member 31 (SLC25A31); transcript variant 1):

TABLE-US-00001 (SEQ ID NO: 1) 1 MHREPAKKKA EKRLFDASSF GKDLLAGGVA AAVSKTAVAP IERVKLLLQV QASSKQISPE 61 ARYKGMVDCL VRIPREQGFF SFWRGNLANV IRYFPTQALN FAFKDKYKQL FMSGVNKEKQ 121 FWRWFLANLA SGGAAGATSL CVVYPLDFAR TRLGVDIGKG PEERQFKGLG DCIMKIAKSD 181 GIAGLYQGFG VSVQGIIVYR ASYFGAYDTV KGLLPKPKKT PFLVSFFIAQ VVTTCSGILS 241 YPFDTVRRRM MMQSGEAKRQ YKGTLDCFVK IYQHEGISSF FRGAFSNVLR GTGGALVLVL 301 YDKIKEFFHI DIGGR;
or be encoded by the nucleic acid comprising or consisting of the sequence of:

TABLE-US-00002 (SEQ ID NO: 2) 1 gcagcttttc cgcacgcgcc tcgccggcgc gcggctctct cagcgtccca agagccactt 61 tctcgccagt acgatgctgc agcggttttc cggttttccg cttcccttca tcgtagctcc 121 cgtactcatt tttagccact gctgccggtt tttatatcct tctccatcat gcatcgtgag 181 cctgcgaaaa agaaggcaga aaagcggctg tttgacgcct catccttcgg gaaggacctt 241 ctggccggcg gagtcgcggc agctgtgtcc aagacagcgg tggcgcccat cgagcgggtg 301 aagctgctgc tgcaggtgca ggcgtcgtcg aagcagatca gccccgaggc gcggtacaaa 361 ggcatggtgg actgcctggt gcggattcct cgcgagcagg gtttcttcag tttttggcgt 421 ggcaatttgg caaatgttat tcggtatttt ccaacacaag ctctaaactt tgcttttaag 481 gacaaataca agcagctatt catgtctgga gttaataaag aaaaacagtt ctggaggtgg 541 tttttggcaa acctggcttc tggtggagct gctggggcaa catccttatg tgtagtatat 601 cctctagatt ttgcccgaac ccgattaggt gtcgatattg gaaaaggtcc tgaggagcga 661 caattcaagg gtttaggtga ctgtattatg aaaatagcaa aatcagatgg aattgctggt 721 ttataccaag ggtttggtgt ttcagtacag ggcatcattg tgtaccgagc ctcttatttt 781 ggagcttatg acacagttaa gggtttatta ccaaagccaa agaaaactcc atttcttgtc 841 tcctttttca ttgctcaagt tgtgactaca tgctctggaa tactttctta tccctttgac 901 acagttagaa gacgtatgat gatgcagagt ggtgaggcta aacggcaata taaaggaacc 961 ttagactgct ttgtgaagat ataccaacat gaaggaatca gttccttttt tcgtggcgcc 1021 ttctccaatg ttcttcgcgg tacagggggt gctttggtgt tggtattata tgataaaatt 1081 aaagaattct ttcatattga tattggtggt aggtaatcgg gagagtaaat taagaaatac 1141 atggatttaa cttgttaaac atacaaatta catagctgcc atttgcatac attttgatag 1201 tgttattgtc tgtattttgt taaagtgcta gttctgcaat aaagcataca ttttttcaag 1261 aatttaaata ctaaaaatca gataaatgtg gattttcctc ccacttagac tcaaacacat 1321 tttagtgtga tatttcattt attataggta gtatatttta atttgttagt ttaaaattct 1381 ttttatgatt aaaaattaat catataatcc tagattaatg ctgaaatcta ggaaatgaaa 1441 gtagcgtctt ttaaattgct attcatttaa tatacctgtt ttcccatctt ttgaagtcat 1501 atggtatgac atatttctta aaagcttatc aatagatgtc atcatatgtg taggcagaaa 1561 taagctttgt tctatatctc ttctaagaca gttgttatta ctgtgtataa tatttacagt 1621 atcagccttt gattatagat gtgatcattt aaaatttgat aatgacttta gtgacattat 1681 aaaactgaaa ctggaaaata aaatggctta tctgctgatg tttatcttta aaataaataa 1741 aatcttgcta gtgtgaatat atcttagaac aaaaggtatc ctcttgaaaa ttagtttgta 1801 tattttgttg acaataaagg aagcttaact gttataaagg aaaaaaaaaa aaaaaa.

[0046] In some embodiments of the disclosure, an ANT4 protein may comprise or consist of the amino acid sequence of ADP/APT translocase 4 (ANT4) (UniProtKB-Q9H0C2; also known as solute carrier family 25 member 31 (SLC25A31); transcript variant 2):

TABLE-US-00003 (SEQ ID NO: 3) 1 MHREPAKKKA EKRLFDASSF GKDLLAGGVA AAVSKTAVAP IERVKLLLQV QASSKQISPE 61 ARYKGMVDCL VRIPREQGFF SFWRGNLANV IRYFPTQALN FAFKDKYKQL FMSGVNKEKQ 121 FWRWFLANLA SGGAAGATSL CVVYPLDFAR TRLGVDIGKG PEERQFKGLG DCIMKIAKSD 181 GIAGLYQGFG VSVQGIIVYR ASYFGAYDTV KGLLPKPKKT PFLVSFFIAQ VVTTCSGILS 241 YPFDTVRRRM MMQSGEAKRQ YKGTLDCFVK IYQHEGISSF FRGAFSNVLR GTGGALVLVL 301 YDKIKEFFHI DIGGR;
or be encoded by the nucleic acid comprising or consisting of the sequence of:

TABLE-US-00004 (SEQ ID NO: 4) 1 gcagcttttc cgcacgcgcc tcgccggcgc gcggctctct cagcgtccca agagccactt 61 tctcgccagt acgatgctgc agcggttttc cggttttccg cttcccttca tcgtagctcc 121 cgtactcatt tttagccact gctgccggtt tttatatcct tctccatcat gcatcgtgag 181 cctgcgaaaa agaaggcaga aaagcggctg tttgacgcct catccttcgg gaaggacctt 241 ctggccggcg gagtcgcggc agctgtgtcc aagacagcgg tggcgcccat cgagcgggtg 301 aagctgctgc tgcaggtgca ggcgtcgtcg aagcagatca gccccgaggc gcggtacaaa 361 ggcatggtgg actgcctggt gcggattcct cgcgagcagg gtttcttcag tttttggcgt 421 ggcaatttgg caaatgttat tcggtatttt ccaacacaag ctctaaactt tgcttttaag 481 gacaaataca agcagctatt catgtctgga gttaataaag aaaaacagtt ctggaggtgg 541 tttttggcaa acctggcttc tggtggagct gctggggcaa catccttatg tgtagtatat 601 cctctagatt ttgcccgaac ccgattaggt gtcgatattg gaaaaggtcc tgaggagcga 661 caattcaagg gtttaggtga ctgtattatg aaaatagcaa aatcagatgg aattgctggt 721 ttataccaag ggtttggtgt ttcagtacag ggcatcattg tgtaccgagc ctcttatttt 781 ggagcttatg acacagttaa gggtttatta ccaaagccaa agaaaactcc atttcttgtc 841 tcctttttca ttgctcaagt tgtgactaca tgctctggaa tactttctta tccctttgac 901 acagttagaa gacgtatgat gatgcaggtc attaatttcc ttataaatta caactcgaag 961 ctgcatctta aaaatttaga gtggtgaggc taaacggcaa tataaaggaa ccttagactg 1021 ctttgtgaag atataccaac atgaaggaat cagttccttt tttcgtggcg ccttctccaa 1081 tgttcttcgc ggtacagggg gtgctttggt gttggtatta tatgataaaa ttaaagaatt 1141 ctttcatatt gatattggtg gtaggtaatc gggagagtaa attaagaaat acatggattt 1201 aacttgttaa acatacaaat tacatagctg ccatttgcat acattttgat agtgttattg 1261 tctgtatttt gttaaagtgc tagttctgca ataaagcata cattttttca agaatttaaa 1321 tactaaaaat cagataaatg tggattttcc tcccacttag actcaaacac attttagtgt 1381 gatatttcat ttattatagg tagtatattt taatttgtta gtttaaaatt ctttttatga 1441 ttaaaaatta atcatataat cctagattaa tgctgaaatc taggaaatga aagtagcgtc 1501 ttttaaattg ctattcattt aatatacctg ttttcccatc ttttgaagtc atatggtatg 1561 acatatttct taaaagctta tcaatagatg tcatcatatg tgtaggcaga aataagcttt 1621 gttctatatc tcttctaaga cagttgttat tactgtgtat aatatttaca gtatcagcct 1681 ttgattatag atgtgatcat ttaaaatttg ataatgactt tagtgacatt ataaaactga 1741 aactggaaaa taaaatggct tatctgctga tgtttatctt taaaataaat aaaatcttgc 1801 tagtgtgaat atatcttaga acaaaaggta tcctcttgaa aattagtttg tatattttgt 1861 tgacaataaa ggaagcttaa ctgttataaa ggaaaaaaaa aaaaaaaa.

[0047] We have identified a class of compounds, such as niclosamide ethanolamine (NEN) and BAM15 (N5,N6-bis(2-Fluorophenyl)-[1,2,5]oxadiazolo[3,4-b]pyrazine-5,6-diamine), that act as targeted mild mitochondrial uncouplers in sperm and can be utilized as sperm incapacitating agents. This rationale is that sperm mitochondrial uncoupling (sMU) drains sperm of energy and makes sperm unable to find and fertilize an egg. The search for specific activators of H.sup.+ leak via sperm-expressing ANT, is a novel strategy to develop nonhormonal contraceptives. Indeed, according to our data, NEN uncouples human sperm mitochondria, significantly decreases sperm beat frequency and hyperactivation. NEN is an oral salicylanilide derivative that has been approved by the US Food and Drug Administration (FDA) since 1958 for human use in the treatment of parasite tapeworm infections.sup.16,28. It has been shown to act as a mitochondrial uncoupler by translocating protons across the inner mitochondrial membrane resulting in futile cycles of glucose and fatty acid oxidation.sup.2,15,31,32. While its mitochondrial uncoupling is sufficient to kill gastrointestinal tapeworms, NEN has shown an excellent safety profile in humans.sup.20, unlike DNP which is mildly toxic and has been associated with an unacceptably high rate of significant adverse effects.sup.29. According to drug repurposing screening studies, niclosamide has strong in vivo and in vitro activity against antibiotic-resistant bacteria.sup.33, and according to another study, may also inhibit Zika virus replication.sup.19. Moreover, niclosamide is recently characterized for uses in diabetes.sup.32, and human glioblastoma tumors.sup.34, colon and ovarian cancers.sup.15,18,35. While the exact molecular mechanism of niclosamide uncoupling action is not fully understood, similar to FA and DNP it should uncouple mitochondria by activating H.sup.+ leak via ANT, and according to our data it does so to sperm mitochondria. Therefore, our data, and the excellent safety profile of niclosamide, and its antimicrobial and antiviral properties indicate that NEN-based products exhibit contraceptive properties, in addition to their antimicrobial and antiviral properties.

[0048] Unless contraindicated or noted otherwise, in these descriptions and throughout this specification, the terms “a” and “an” mean one or more, the term “or” means and/or. The examples and embodiments described herein are for illustrative purposes only and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this application and scope of the appended claims. All publications, patents, and patent applications cited herein, including citations therein, are hereby incorporated by reference in their entirety for all purposes.

EXAMPLES

Example 1: Identification of ANT as the Principal Mitochondrial Uncoupling Protein in Non-Fat Tissues

[0049] We employed direct patch-clamp recording from vesicles of the whole intact inner mitochondrial membrane (IMM; so-called mitoplasts, FIG. 3), which allow high-resolution functional analysis of mitochondrial ion channels and transporters in their native membrane environment.sup.10,36,37. We recently used this method to characterize the mechanism by which fatty acids (FA) induce the H.sup.+ leak via uncoupling protein 1 (UCP1), the protein responsible formitochondrial thermogenesis in brown fat.sup.37. However, UCP1 is fat-specific, and the mechanisms of thermogenesis in non-adipose tissues that constitute the majority of the body, are still poorly understood. Here we demonstrate that the whole-IMM patch clamp can be used to directly measure the UCP1-independent FA-induced H.sup.+ leak in non-adipose tissues

[0050] ANT is responsible for H.sup.+ leak across the IMM of non-adipose tissues and conducts H.sup.+ only in the presence of fatty acids (FA) (FIGS. 4 and 5).sup.10. Additionally, using whole-IMM patch-clamp this group showed that mitochondrial uncoupler DNP strongly and specifically activates proton leak via ANT and can serve as pharmacological regulators of ANT-dependent mitochondrial uncoupling by mimicking ANT endogenous activator-FA. I.sub.H mediated by ANT is blocked by a classical ANT inhibitor carboxyatractyloside (CATR, FIG. 5).

[0051] We recorded DNP-induced I.sub.H in heart of ANT1-deficient mice (ANT1 is the dominant isoform of ANT in this tissue). These experiments demonstrate the I.sub.H induced by DNP primarily depends on ANT (FIG. 5B-D). These results indicate that, in contrast to the previously proposed model, DNP does not uncouple mitochondria as simple chemical protonophores but target ANT. Thus, data demonstrate that the mitochondrial uncoupler-activated I.sub.H can be recorded across the whole IMM using the patch-clamp method, and that this current is mediated by ANT.

Example 2: Uncoupling of Human Sperm Mitochondria Reduces Sperm Motility and Prevents Fertilization

[0052] Here we have studied the effect of DNP, niclosamide, and BAM15, three known mitochondrial uncouplers, on their ability to uncouple sperm mitochondria.sup.13,38,39. As shown in FIG. 6B, both BAM15 and NEN elicit strong sMU as assessed by mitochondrial depolarization. Importantly, niclosamide, the most potent of the two compounds, also decreased sperm beat frequency from 14 Hz to 6 Hz, (FIG. 6A), inhibited hyperactivatio (FIG. 6C) at concentrations as low as 1 μM.

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