US2002132973A1PendingUtilityA1

Peptide parathyroid hormone analogs

Priority: May 14, 1997Filed: Mar 13, 2002Published: Sep 19, 2002
Est. expiryMay 14, 2017(expired)· nominal 20-yr term from priority
A61P 3/14A61P 43/00A61P 5/18A61K 38/00C07K 14/635C07D 211/34A61P 19/00A61P 19/10
41
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Claims

Abstract

This invention is directed to cyclic analogs of hPTH(1-34) and hPTHrP(1-34), to pharmaceutical compositions comprising these peptide compounds, and to a method of treating diseases associated with calcium regulation in the body.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A cyclic peptide compound of formula  
       X-A 10 -A 11 -A 12 -A 13 -A 14 -A 15 -A 16 -A 17 -A 18 -A 19 -A 20 -A 21 -A 22 -A 23 -A 24 A 25 -A 26 -A 27 -Y  
       or a pharmaceutically acceptable salt or prodrug thereof wherein 
 X is selected from the group consisting of 
 (a) R 1a -A 0 -A 1 -A 2 -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 -,  
 (b) R 1a -A 2 -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 -,  
 (c) R 1b -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 -,  
 (d) R 1a -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 -,  
 (e) R 1a -A 5 -A 6 -A 7 -A 8 -A 9 -,  
 (f) R 1a -A 6 -A 7 -A 8 -A 9 -,  
 (g) R 1a -A 7 -A 8 -A 9 -,  
 (h) R 1a -A 8 -A 9 -,  
 (i) R 1a -A 9 -, and  
 (j) R 1a -;  
 
 Y is selected from the group consisting of 
 (a) -R 3 ,  
 (b) -A 28 -R 3 ,  
 (c) -A 28 -A 29 -R 3 ,  
 (d) -A 28 -A 29 -A 30 -R 3 ,  
 (e) -A 28 -A 29 -A 30 -A 31 -R 3 ,  
 (f) -A 28 -A 29 -A 30 -A 31 -A 32 -R 3 ,  
 (g) -A 18 -A 29 -A 30 -A 31 -A 32 -A 33 -R 3 , and  
 (h) -A 28 -A 29 -A 30 -A 31 -A 32 -A 33 -A 34 -R 3 ;  
 
 R 1a  is H, alkyl, aralkyl or —COR 2 ;  
 R 1b  is R 1a  or a group of formula  
                     
 R 2  is alkyl, alkenyl, alkynyl, aryl or aralkyl;  
 R 3  is a group of formula A 35 -OR 4  or A 35 -NR 4 R 5 ;  
 R 4  and R 5  are independently H or lower alkyl;  
 R 6  and R 9  are independently H or alkyl;  
 R 7  is alkyl;  
 R 8  is H, alkyl or COR 2 ;  
 R 10  is H or halogen;  
 R 11  is alkyl or aralkyl;  
 m is 1, 2 or 3;  
 n is 3 or 4;  
 A 0  is absent or a peptide of from one to six amino acid residues;  
 A 1  is Ser, Ala, Gly or D-Pro, or an equivalent amino acid thereof;  
 A 2  is Ala, Val or Gly, or an equivalent amino acid thereof;  
 A 3  is Ala, Ser, Gly or D-Pro, or an equivalent amino acid thereof;  
 A 4  is Glu, Ala or Gly, or an equivalent amino acid thereof;  
 A 5  is Ile, His, Ala or Gly, or an equivalent amino acid thereof;  
 A 6  is Ala, Gln, Gly or D-Pro, or an equivalent amino acid thereof;  
 A 7  is Ala, Leu, Gly, or an equivalent amino acid thereof;  
 A 8  is Leu, Nle, Gly or D-Pro, or an equivalent amino acid thereof;  
 A 9  is His, Ala, D-Pro or Gly, or an equivalent amino acid thereof;  
 A 10  is Ala, Asn, Asp, Glu, Gly or Lys;  
 A 11  is Ala, Gly, Leu or Lys, or an equivalent amino acid thereof;  
 A 12  is Ala or Gly, or an equivalent amino acid thereof;  
 A 13  is Ala, Gly or Lys;  
 A 14  is Ala, Asp, Gly, His, Lys or Ser;  
 A 15  is Ala, Gly, Ile, D-Pro or Leu, or an equivalent amino acid thereof;  
 A 16  is Asn, Ala, Gly, D-Pro or Gln, or an equivalent amino acid thereof;  
 A 17  is Ala, Asp, Gly, Lys or Ser;  
 A 18  is Asp, Leu, Lys, Orn or Nle;  
 A 19  is Arg or Glu, or an equivalent amino acid thereof;  
 A 20  is Arg or an equivalent amino acid thereof;  
 A 21  is Arg, Asp, Lys or Val;  
 A 22  is Asp, Glu, Lys, Orn or Phe;  
 A 23  is Leu, Phe or Trp, or an equivalent amino acid thereof;  
 A 24  is Leu or an equivalent amino acid thereof;  
 A 25  is Arg, Asp, Glu, His or Lys;  
 A 26  is His or Lys;  
 A 27  is Leu or Lys, or an equivalent amino acid thereof;  
 A 28  is Ile or Leu, or an equivalent amino acid thereof;.  
 A 29  is Ala, Asp, Glu or Gin;  
 A 30  is Asp, Glu or Lys;  
 A 31  is Ile, Leu or Val, or an equivalent amino acid thereof;  
 A 32  is H is, or an equivalent amino acid thereof,  
 A 33  is Asn or Thr, or an equivalent amino acid thereof;  
 A 34  is Ala or Phe, or an equivalent amino acid thereof  
 A 35  is absent or a peptide of from 1 to 4 amino acids; and  
 the side chains of at least one of the following pairs of amino acid residues, A 10  and A 14 , A 13  and A 17 , A 14  and A 18 , A 17  and A 21 , and A 18 , A 22 , and A 25 , A 25  and A 29  and A 26  and A 30  are linked through an amide bond to form a bridge, and the side chain of each of A 10 , A 13 , A 14 , A 17 , A 18 , A 21 , A 22 , A 25 , A 26 , A 29 , and A 30  contributes, at most, to the formation of a single bridge; provided that  
 (a) when the side chains of A 13  and A 17  are linked through an amide bond to form a bridge, then the side chains of at least one of A 18  and A 22 , A 21  and A 25  and A 25  and A 29  are also linked through an amide, ester, disulfide or lanthionine bond;  
 (b) that when the side chains of A 26  and A 30  are linked through an amide bond to form a bridge, then the side chains of at least one of A 10  and A 14 , A 14  and A 18 , A 17  and A 21  and A 25  are also linked through an amide bond; and  
 (c) that when the side chains of A 13  and A 17  and A 26  and A 30  are linked through an amide bond to form a bridge, then the side chains of A 18  and A 22  or A 21  and A 25  are also linked through an amide bond, wherein the bridge formed between the side chains of another pair of amino acid residues.  
 
     
     
         2 . A peptide compound according to  claim 1 , or a pharmaceutically acceptable salt or prodrug thereof wherein R 1a  is H and Y is NH 2 .  
     
     
         3 . A peptide compound according to  claim 2 , or a pharmaceutically acceptable salt or prodrug thereof wherein X is 
 (a) R 1a -A 1 -A 2 -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 -,    (b) R 1a -A 2 -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 - or    (c) R 1a -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 -.    
     
     
         4 . A peptide compound according to  claim 3 , or a pharmaceutically acceptable salt or prodrug thereof wherein A 1  is Ala, Gly or D-Pro; A 8  is Nle and A 27  is Leu.  
     
     
         5 . A peptide compound according to  claim 4 , or a pharmaceutically acceptable salt or prodrug thereof wherein 
 (i) the side chains of A 10  and A 14  are linked through an amide bond to form a bridge;    (ii) the side chains of A 14  and A 18  are linked through an amide bond to form a bridge;    (iii) the side chains of A 17  and A 21  are linked through an amide bond to form a bridge;    (iv) the side chains of A 18  and A 22  are linked through an amid bond to form a bridge;    (v) the side chains of A 21  and A 25  are linked through an amide bond to form a bridge; or    (vi) the side chains of A 25  and A 29  are linked through an amide bond to form a bridge.    
     
     
         6 . A peptide compound according to  claim 5 , or a pharmaceutically acceptable salt or prodrug thereof wherein A 10  is Asp or Lys; A 13  is Lys; A 14  is Asp or Lys; A 17  is Asp or Ser; A 18  is Nle; A 21  is Arg or Val; A 22  is Glu or Phe; A 25  is Arg or His; A 26  is Lys or His, A 29  is Ala or Gln; and A 30  is Asp or Glu; and the side-chains of A 10  and A 14  are linked through an amide bond to form a bridge.  
     
     
         7 . A peptide compound according to  claim 5 , or a pharmaceutically acceptable salt or prodrug thereof wherein A 10  is Asn or Asp; A 13  is Lys; A 14  is Asp or Lys; A 17  is Asp or Ser; A 18  is Nle; A 21  is Arg or Val; A 22  is Glu or Phe; A 25  is Arg or His; A 26  is His or Lys; A 29  is Ala or Gln; and A 30  is Asp or Glu; and the side chains of A 14  and A 18  are linked through an amide bond to form a bridge.  
     
     
         8 . A peptide compound according to  claim 5 , or a pharmaceutically acceptable salt or prodrug thereof wherein A 10  is Asn or Asp; A 13  is Lys; A 14  is His or Ser; A 17  is Asp or Lys; A 18  is Nle; A 21  is Asp or Lys; A 22  is Glu or Phe; A 25  is Arg or His; A 26  is His or Lys; A 29  is Ala or Gln; and A 30  is Asp or Glu; and the side chains of A 17  and A 21  are linked through an amide bond to form a bridge.  
     
     
         9 . A peptide compound according to  claim 5 , or a pharmaceutically acceptable salt or prodrug thereof wherein A 10  is Asn or Asp; A 13  is Lys; A 14  is His or Ser; A 17  is Asp or Ser; A 18  is Asp, Lys or Orn; A 21  is Arg or Val; A 22  is Asp, Glu, Lys or Orn; A 25  is Arg or His; A 26  is His or Lys; A 29  is Ala or Gln; and A 30  is Asp or Glu; and the side chains of A 18  and A 22  are linked through an amide bond to form a bridge.  
     
     
         10 . A peptide compound according to  claim 5 , or a pharmaceutically acceptable salt or prodrug thereof wherein A 10  is Asn or Asp; A 13  is Lys; A 14  is His or Ser; A 17  is Asp or Ser; A 18  is Nle; A 21  is Asp or Lys; A 22  is Glu or Phe; A 25  is Asp or Lys; A 26  is His or Lys; A 29  is Ala or Gln; and A 30  is Asp or Glu; and the side chains of A 25  and A 29  are linked through an amide bond to form a bridge.  
     
     
         11 . A peptide compound according to  claim 5 , or a pharmaceutically acceptable salt or prodrug thereof wherein A 10  is Asn or Asp; A 13  is Lys; A 14  is His or Ser; A 17  is Asp or Ser; A 18  is Nle; A 21  is Arg or Val; A 22  is Glu or Phe; A 25  is Asp or Lys; A 26  is His or Lys; A 29  is Asp or Lys; and A 30  is Asp or Glu; and the side chains of A 25  and A 29  are linked through an amide bond to form a bridge.  
     
     
         12 . A peptide compound according to  claim 4 , or a pharmaceutically acceptable salt or prodrug thereof wherein 
 (i) the side-chains of A 13  and A 17  are linked through an amide bond and the side-chains of A 18  and A 22  are linked through an amide bond to form a bridge; and    (ii) the side-chains of A 18  and A 22  are linked through an amide bond and the side-chains of A 26  and A 30  are linked through an amide bond to form a bridge.    
     
     
         13 . A peptide compound according to  claim 12 , or a pharmaceutically acceptable salt or prodrug thereof wherein A 10  is Asn or Asp; A 13  is Lys or Asp; A 14  is His or Ser; A 17  is Lys or Asp; A 18  is Lys or Asp; A 21  is Val or Arg; A 22  is Glu, Lys or Asp; A 25  is Arg or His; A 26  is His or Lys; A 29  is Ala or Gln; and A 30  is Asp or Glu; and the side-chains of A 13  and A 17  are linked through an amide bond and the side-chains of A 18  and A 2  are linked through an amide bond to form a bridge.  
     
     
         14 . A peptide compound according to  claim 12 , or a pharmaceutically acceptable salt or prodrug thereof wherein A 10  is Asn or Asp; A 13  is Lys; A 14  is His or Ser; A 17  is Ser or Asp; A 18  is Lys or Asp; A 21  is Val or Arg; A 22  is Glu, Lys or Asp; A 25  is Arg or His; A 26  is Lys or Asp; A 29  is Ala or Gln; and A 30  is Lys or Asp; and the side-chains of A 18  and A 22  are linked through an amide bond and the side-chains of A 26  and A 30  are linked through an amide bond to form a bridge.  
     
     
         15 . A peptide compound according to  claim 4 , or a pharmaceutically acceptable salt or prodrug thereof wherein the side-chains of A 13  and A 17  are linked through an amide bond and the side-chains of A 18  and A 22  are linked through an amide bond and the side chains of A 26  and A 30  are linked through an amide bond to form a bridge.  
     
     
         16 . A peptide compound according to  claim 15 , or a pharmaceutically acceptable salt or prodrug thereof, wherein A 10  is Asn or Asp; A 13  is Lys or Asp; A 14  is His or Ser; A 17  is Lys or Asp; A 18  is Lys or Asp; A 21  is Val or Arg; A 22  is Glu, Lys or Asp, A 25  is Arg or His; A 26  is Lys or Asp; A 29  is Ala or Gln; and A 30  is Lys or Asp.  
     
     
         17 . Bicyclo(K 13 -D 17 ,K 26 -D 30 )[A 1 ,Nle 8,18 ,D 17 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 79) or a pharmaceutically acceptable salt or prodrug thereof.  
     
     
         18 . A peptide compound according to  claim 2 , or a pharmaceutically acceptable salt or prodrug thereof wherein 
 X is selected from the group consisting of 
 (a) R 1a -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 -,  
 (b) R 1a -A 5 -A 6 -A 7 -A 8 -A 9 -,  
 (c) R 1a -A 6 -A 7 -A 8 -A 9 -,  
 (d) R 1a -A 7 -A 8 -A 9 ,  
 (e) R 1a -A 8 -A 9 ,  
 (f) R 1b -A 9 -, and  
   (g) R 1b -;    
     
     
         19 . A peptide compound according to  claim 18 , or a pharmaceutically acceptable salt or prodrug thereof wherein A 8  is Nle and A 27  is Leu.  
     
     
         20 . A peptide compound according to  claim 19 , or a pharmaceutically acceptable salt or prodrug thereof wherein the side chains of A 18  and A 22  are linked through an amide bond to form a bridge.  
     
     
         21 . A peptide compound according to  claim 20 , or a pharmaceutically acceptable salt or prodrug thereof wherein A 10  is Asn or Asp; A 13  is Lys; A 14  is His or Ser; A 17  is Asp or Ser; A 18  is Asp, Lys or Orn; A 21  is Arg or Val; A 22  is Asp, Glu, Lys or Orn; A 25  is Arg or His; A 26  is His or Lys; A 29  is Ala or Gln; and A 30  is Asp or Glu.  
     
     
         22 . A peptide compound according to  claim 1  selected from 
 cyclo(K 18 -D 22 )[K 18 ,D 22 ,L 27 ]hPTH(10-31)NH 2  (SEQ ID NO: 56);  
 cyclo(K 18 -D 22 )[K 18 ,D 22 ,L 27 ]hPTH(9-31)NH 2  (SEQ ID NO: 57);  
 cyclo(K 18 -D 22 )[Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(8-31)NH 2  (SEQ ID NO: 58);  
 cyclo(K 18 -D 22 )[Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(7-31)NH 2  (SEQ ID NO: 59);  
 cyclo(K 18 -D 22 )[Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(6-31)NH 2  (SEQ ID NO: 60);  
 cyclo(K 18 -D 22 )[Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(5-31)NH 2  (SEQ ID NO: 61);  
 cyclo(K 18 -D 22 )[Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(5-31)NH 2  (SEQ ID NO: 62);  
 cyclo(K 18 -D 22 )[Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(4-34)NH 2  (SEQ ID NO: 65); and  
 cyclo(K 18 -D 22 )[K 18 ,D 22 ]hPTHrP(7-34)NH 2  (SEQ ID NO: 77);  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         23 . A method of treating diseases associated with calcium regulation in a patient in need of such treatment comprising administering to the patient a therapeutically effective amount of a peptide compound of  claim 3 , or a pharmaceutically acceptable salt or prodrug thereof.  
     
     
         24 . The method of  claim 23  wherein said diseases associated with calcium regulation in the body are selected from hypocalcemia; osteopaenia, osteoporosis; hyperparathyroidism; hypoparathyroidism; glucocorticoid- and immunosuppresant-induced osteopaenia; and bone fracture and refracture.  
     
     
         25 . A method of treating osteopaenia or osteoporosis in a host mammal in need of such treatment comprising administering to a mammal in need of such treatment a therapeutically effective amount of a peptide compound of  claim 3 , or a pharmaceutically acceptable salt or prodrug thereof.  
     
     
         26 . The method of  claim 23  comprising the pulsatile subcutaneous or intrapulmonary administration of a therapeutically effective amount of a peptide compound of  claim 1 , or a pharmaceutically acceptable salt or prodrug thereof.  
     
     
         27 . The method of  claim 25  comprising the pulsatile subcutaneous or intrapulmonary administration of a therapeutically effective amount of a peptide compound of  claim 2 , or a pharmaceutically acceptable salt or prodrug thereof.  
     
     
         28 . A method of treating diseases associated with calcium regulation in a patient in need of such treatment comprising administering to the patient a therapeutically effective amount of a peptide compound of  claim 18 , or a pharmaceutically acceptable salt or prodrug thereof.  
     
     
         29 . The method of  claim 28  wherein said diseases associated with calcium regulation in the body are selected from hyperparathyrodism and hyperparathyrodism-related hypercalcemia crisis, hypercalcemia of malignancy, renal failure and hypertension.  
     
     
         30 . The method of claim  28 - comprising the pulsatile subcutaneous or intrapulmonary administration of a therapeutically effective amount of a peptide compound of  claim 18 , or a pharmaceutically acceptable salt or prodrug thereof.  
     
     
         31 . The method of  claim 29  comprising the pulsatile subcutaneous or intrapulmonary administration of a therapeutically effective amount of a peptide compound of  claim 18 , or a pharmaceutically acceptable salt or prodrug thereof.  
     
     
         32 . A peptide compound of formula  
       X-A 10 -A 11 -A 12 -A 13 -A 14 -A 15 -A 16 -A 17 -A 18 -A 19 -A 20 -A 21 -A 22 -A 23 -A 24 -A 25 -A 26 -A 27 -Y  
       or a pharmaceutically acceptable salt or prodrug thereof wherein 
 X is selected from the group consisting of 
 (a) R 1a -A 0 -A 1 -A 2 -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 -,  
 (b) R 1a -A 2 -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 -,  
 (c) R 1b -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 -,  
 (d) R 1a -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 -,  
 (e) R 1a -A 5 -A 6 -A 7 -A 8 -A 9 -,  
 (f) R 1a -A 6 -A 7 -A 8 -A 9 -,  
 (g) R 1a -A 7 -A 8 -A 9 -,  
 (h) R 1a -A 8 -A 9 -, and  
 (i) R 1a -A 9 -, and  
 (j) R 1a -;  
 
 Y is selected from the group consisting of 
 (a ) -R 3 ,  
 (b) -A 28 -R 3 ,  
 (c) -A 28 -A 29 -R 3 ,  
 (d) -A 28 -A 29 -A 30 -R 3 ,  
 (e) -A 28 -A 29 -A 30 -A 31 -R 3 ,  
 (f) -A 28 -A 29 -A 30 -A 31 -A 32 -R 3 ,  
 (g) -A 28 -A 29 -A 30 -A 31 -A 32 -A 33 -R 3 , and  
 (h) -A 28 -A 29 -A 30 -A 31 -A 32 -A 33 -A 34 -R 3 ;  
 
 R 1a  is H, alkyl, aralkyl or —COR 2 ;  
 R 1b  is R 1a  or a group of formula  
                     
 R 2  is alkyl, alkenyl, alkynyl, aryl or aralkyl;  
 R 3 is a group of formula A 35 -OR 4  or A 35 -NR 4 R 5 ;  
 R 4  and R 5  are independently H or lower alkyl;  
 R 6  and R 9  are independently H or alkyl;  
 R 7  is alkyl;  
 R 8  is H, alkyl or COR 2 ;  
 R 10  is H or halogen;  
 R 11  is alkyl or aralkyl;  
 A 0  is absent or a peptide of from one to six amino acid residues;  
 A 1  is Ser, Ala, Gly or D-Pro or an equivalent amino acid thereof;  
 A 2  is Ala, Val, Gly or an equivalent amino acid thereof;  
 A 3  is Ala, Ser, Gly or D-Pro or an equivalent amino acid thereof;  
 A 4  is Glu, Ala or Gly or an equivalent amino acid thereof;  
 A 5  is Ile, His, Ala or Gly or an equivalent amino acid thereof;  
 A 6  is Ala, Gln, Gly or D-Pro or an equivalent amino acid thereof;  
 A 7  is Ala, Leu, Gly or an equivalent amino acid thereof;  
 A 8  is Leu, Nle or Gly or D-Pro or an equivalent amino acid thereof;  
 A 9  is His, Ala, Gly or D-Pro or an equivalent amino acid thereof;  
 A 10  is Ala, Asn, Gly Lys, Asp or D-Pro or an equivalent amino acid thereof;  
 A 11  is Ala, Gly, Leu or Lys or an equivalent amino acid thereof;  
 A 12  is Ala or Gly or an equivalent amino acid thereof;  
 A 13  is Ala, Gly or Lys or an equivalent amino acid thereof;  
 A 14  is Ala, Gly, His, Ser, Asp, Lys or D-Pro or an equivalent amino acid thereof;  
 A 15  is Ala, Gly, Ile, D-Pro or Leu or an equivalent amino acid thereof;  
 A 16  is Asn, Ala, Gly, D-Pro or Gln or an equivalent amino acid thereof;  
 A 17  is Ala, Asp, Gly, Ser, Lys or D-Pro or an equivalent amino acid thereof;  
 A 18  is Lys or an equivalent amino acid thereof;  
 A 19  is Arg or Glu or an equivalent amino acid thereof;  
 A 20  is Arg or an equivalent amino acid thereof;  
 A 21  is Arg, Lys, Asp or Val or an equivalent amino acid thereof;  
 A 22  is Asp, Lys, Orn -or Glu or an equivalent amino acid thereof;  
 A 23  is Leu, Phe or Trp or an equivalent amino acid thereof;  
 A 24  is Leu or an equivalent amino acid thereof;  
 A 25 is Arg, His, Asp, Lys or Gin or an equivalent amino acid thereof;  
 A 26  is Lys or His or an equivalent amino acid thereof;  
 A 27  is Leu or Lys or an equivalent amino acid thereof;  
 A 28  is Ile or Leu or an equivalent amino acid thereof;  
 A 29  is Ala, Asp, Glu or Gln or an equivalent amino acid thereof;  
 A 30  is Asp, Lys or Glu or an equivalent amino acid thereof;  
 A 31  is Ile, Leu or Val or an equivalent amino acid thereof;  
 A 32  is His or an equivalent amino acid thereof;  
 A 33  is Asn or Thr or an equivalent amino acid thereof; and  
 A 34  is Ala or Phe or an equivalent amino acid thereof; and  
 A 35  is absent or a peptide of from 1 to 4 amino acids.  
 
     
     
         33 . A peptide compound according to  claim 32 , or a pharmaceutically acceptable salt or prodrug thereof wherein R 1a  is H and Y is NH 2 .  
     
     
         34 . A peptide compound according to  claim 33 , or a pharmaceutically acceptable salt or prodrug thereof wherein X is 
 (a) R 1a -A 1 -A 2 -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 -,    (b) R 1a -A 2 -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 - or    (c) R 1a -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 -.    
     
     
         35 . A peptide compound according to  claim 34 , or a pharmaceutically acceptable salt or prodrug thereof wherein 
 A 1  is Ser, Ala, Gly or D-Pro;    A 2  is Ala, Val or Gly;    A 3  is Ala, Ser, Gly or D-Pro;    A 4  is Glu, Ala or Gly;    A 5  is Ile, His, Ala or Gly;    A 6  is Ala, Gln, Gly or D-Pro;    A 7  is Ala, Leu, Gly;    A 8  is Leu, Nle, Gly or D-Pro;    A 9  is His, Ala, Gly or D-Pro;    A 10  is Ala, Asn, Gly, Asp or D-Pro;    A 11  is Ala, Gly, Leu or Lys;    A 12  is Ala or Gly;    A 13  is Ala, Gly or Lys;    A 14  is Ala, Gly, His, Ser or D-Pro;    A 15  is Ala, Gly, Ile or D-Pro;    A 16  is Asn, Ala, Gly, D-Pro or Gln;    A 17  is Ala, Asp, Gly, Ser or D-Pro;    A 18  is Lys;    A 19  is Arg or Glu;    A 20  is Arg;    A 21  is Arg or Val;    A 22  is Asp, Lys, Orn or Glu;    A 23  is Leu, Phe or Trp;    A 24  is Leu;    A 25  is Arg or His;    A 26  is Lys or His;    A 27  is Leu or Lys;    A 28  is Ile or Leu or an equivalent amino acid thereof;    A 29  is Ala or Gln;    A 30  is Asp or Glu;    A 31  is Ile, Leu or Val;    A 32  is His;    A 33  is Asn or Thr; and    A 34  is Ala or Phe.    
     
     
         36 . A peptide compound according to  claim 35 , or a pharmaceutically acceptable salt or prodrug thereof wherein A 1  is Ala, Gly or D-Pro; A 8  is Nle, A 22  is Asp and A 27  is Leu.  
     
     
         37 . A peptide compound according to  claim 36 , or a pharmaceutically acceptable salt or prodrug thereof wherein X is R 1a -A 1 -A 2 -A 3 -A 4 -A 5 -A 6 -A 7 -A 8 -A 9 -.  
     
     
         38 . A peptide compound according to  claim 1  which is 
 [A 1 ,Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 4)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         39 . A pharmaceutical composition comprising a peptide compound of  claim 32 , or a pharmaceutically acceptable salt or prodrug thereof, and a pharmaceutically acceptable carrier.  
     
     
         40 . A method of treating diseases associated with calcium regulation in a patient in need of such treatment comprising administering to the patient a therapeutically effective amount of a peptide compound of  claim 32 , or a pharmaceutically acceptable salt or prodrug thereof.  
     
     
         41 . The method of  claim 40  wherein said diseases associated with calcium regulation in the body are selected from hypocalcemia; osteopaenia, osteoporosis; hyperparathyroidism; hypoparathyroidism; glucocorticoid- and immunosuppresant-induced osteopaenia; and bone fracture and refracture.  
     
     
         42 . A method of treating osteopaenia or osteoporosis in a host mammal in need of such treatment comprising administering to a mammal in need of such treatment a therapeutically effective amount of a peptide compound of  claim 32 , or a pharmaceutically acceptable salt or prodrug thereof.  
     
     
         43 . The method of  claim 40  comprising the pulsatile subcutaneous or intrapulmonary administration of a therapeutically effective amount of a peptide compound of  claim 33 , or a pharmaceutically acceptable salt or prodrug thereof.  
     
     
         44 . The method of  claim 42  comprising the pulsatile subcutaneous or intrapulmonary administration of a therapeutically effective amount of a peptide compound of  claim 33 , or a pharmaceutically acceptable salt or prodrug thereof.  
     
     
         45 . A peptide compound according to  claim 1  which is 
 Cyclo(K 18 -D 22 )[A 1 ,Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(1-34)NH 2  (SEQ ID NO: 46)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         46 . A peptide compound according to  claim 1  which is 
 Cyclo(K 18 -D 22 )[A 1,10 ,Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 12)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         47 . A peptide compound according to  claim 1  which is 
 Cyclo(K 18 -D 22 )[A 1,12 ,Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 14)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         48 . A peptide compound according to  claim 1  which is 
 Cyclo(K 18 -D 22 )[A 1,13 ,Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 15)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         49 . A peptide compound according to  claim 1  which is 
 Cyclo(K 18 -D 22 )[A 1,14 ,Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO; 16)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         50 . A peptide compound according to  claim 1  which is 
 Cyclo(K 18 -D 22 )[A 1,16 ,Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 18)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         51 . A peptide compound according to  claim 1  which is 
 Cyclo(K 18 -D 22 )[A 1,17 ,Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 19)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         52 . A peptide compound according to  claim 1  which is 
 Cyclo(K 18 -D 22 )[A 1 ,G 3 ,Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 22)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         53 . A peptide compound according to  claim 1  which is 
 Cyclo(K 18 -D 22 )[A 1 ,G 13 ,Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 31)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         54 . A peptide compound according to  claim 1  which is 
 Cyclo(K 18 -D 22 )[A 1 ,G 16 ,Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 34)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         55 . A peptide compound according to  claim 1  which is 
 Cyclo(K 18 -D 22 )[A 1 ,G 17 ,Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 35)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         56 . A peptide compound according to  claim 1  which is 
 Cyclo(K 18 -D 22 )[D-P 1 ,Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 36)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         57 . A peptide compound according to  claim 1  which is 
 Cyclo(D 18 -K 22 )[A 1 ,Nle 8 ,D 18 ,K 22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 47)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         58 . A peptide compound according to  claim 1  which is 
 Cyclo(K 18 -E 22 )[A 1 ,Nle 8 ,K 18 ,E 22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 50)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         59 . A peptide compound according to  claim 1  which is 
 Cyclo(O 18 -E 22 )[A 1 ,Nle 8 ,O 18 ,E 22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 51)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         60 . A peptide compound according to  claim 1  which is 
 Cyclo(K 18 -D 22 )[A 1 ,Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(1-30)NH 2  (SEQ ID NO: 52)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         61 . A peptide compound according to  claim 1  which is 
 Cyclo(K 14 -D 8 )[A 1 ,Nle 8 ,K 14 ,D 18 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 67)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         62 . A peptide compound according to  claim 1  which is 
 Cyclo(K 18 -D 22 )[K 18 ,D 22 ]hPTHrP(1-34)NH 2  (SEQ ID NO: 71)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         63 . A peptide compound according to  claim 1  which is 
 Bicyclo(K 13 -D 17 ,K 18 -D 22 )[A 1 ,Nle 8 ,D 17,22 ,K 18 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 73)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         64 . A peptide compound according to  claim 1  which is 
 Bicyclo(K 18 -D 22 ,K 26 -D 30 )[A 1 ,Nle 8 ,K 18 ,D 22 ,L 27 ]hPTH(1-3 l)NH 2  (SEQ ID NO: 74)  
 or a pharmaceutically acceptable salt or prodrug thereof.  
 
     
     
         65 . A peptide compound according to  claim 1  which is 
 Tricyclo(K 13 -D 17 ,K 18 -D 22 ,K 26 -D 30 )[A 1 ,Nle 8 ,K 18 ,D 17,22 ,L 27 ]hPTH(1-31)NH 2  (SEQ ID NO: 80)  
 or a pharmaceutically acceptable salt or prodrug thereof.

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