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2018 ; 8
(1
): 3660
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A small molecule inhibitor of Nicotinamide N-methyltransferase for the treatment
of metabolic disorders
#MMPMID29483571
Kannt A
; Rajagopal S
; Kadnur SV
; Suresh J
; Bhamidipati RK
; Swaminathan S
; Hallur MS
; Kristam R
; Elvert R
; Czech J
; Pfenninger A
; Rudolph C
; Schreuder H
; Chandrasekar DV
; Mane VS
; Birudukota S
; Shaik S
; Zope BR
; Burri RR
; Anand NN
; Thakur MK
; Singh M
; Parveen R
; Kandan S
; Mullangi R
; Yura T
; Gosu R
; Ruf S
; Dhakshinamoorthy S
Sci Rep
2018[Feb]; 8
(1
): 3660
PMID29483571
show ga
Nicotinamide N-methyltransferase (NNMT) is a cytosolic enzyme that catalyzes the
transfer of a methyl group from the co-factor S-adenosyl-L-methionine (SAM) onto
the substrate, nicotinamide (NA) to form 1-methyl-nicotinamide (MNA). Higher NNMT
expression and MNA concentrations have been associated with obesity and type-2
diabetes. Here we report a small molecule analog of NA, JBSNF-000088, that
inhibits NNMT activity, reduces MNA levels and drives insulin sensitization,
glucose modulation and body weight reduction in animal models of metabolic
disease. In mice with high fat diet (HFD)-induced obesity, JBSNF-000088 treatment
caused a reduction in body weight, improved insulin sensitivity and normalized
glucose tolerance to the level of lean control mice. These effects were not seen
in NNMT knockout mice on HFD, confirming specificity of JBSNF-000088. The
compound also improved glucose handling in ob/ob and db/db mice albeit to a
lesser extent and in the absence of weight loss. Co-crystal structure analysis
revealed the presence of the N-methylated product of JBSNF-000088 bound to the
NNMT protein. The N-methylated product was also detected in the plasma of mice
treated with JBSNF-000088. Hence, JBSNF-000088 may act as a slow-turnover
substrate analog, driving the observed metabolic benefits.
|Animals
[MESH]
|Body Weight/drug effects
[MESH]
|Diabetes Mellitus, Type 2/drug therapy/enzymology
[MESH]