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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Toxicol+Environ+Health+B+Crit+Rev
2016 ; 19
(5-6
): 213-230
Nephropedia Template TP
gab.com Text
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English Wikipedia
Investigating palygorskite s role in the development of mesothelioma in southern
Nevada: Insights into fiber-induced carcinogenicity
#MMPMID27705545
Larson D
; Powers A
; Ambrosi JP
; Tanji M
; Napolitano A
; Flores EG
; Baumann F
; Pellegrini L
; Jennings CJ
; Buck BJ
; McLaurin BT
; Merkler D
; Robinson C
; Morris P
; Dogan M
; Dogan AU
; Pass HI
; Pastorino S
; Carbone M
; Yang H
J Toxicol Environ Health B Crit Rev
2016[]; 19
(5-6
): 213-230
PMID27705545
show ga
Similar to asbestos fibers, nonregulated mineral fibers can cause malignant
mesothelioma (MM). Recently, increased proportions of women and young individuals
with MM were identified in southern Nevada, suggesting that environmental
exposure to carcinogenic fibers was causing the development of MM. Palygorskite,
a fibrous silicate mineral with a history of possible carcinogenicity, is
abundant in southern Nevada. In this study, our aim was to determine whether
palygorskite was contributing to the development of MM in southern Nevada. While
palygorskite, in vitro, displayed some cytotoxicity toward primary human
mesothelial (HM) cells and reduced their viability, the effects were roughly half
of those observed when using similar amounts of crocidolite asbestos. No Balb/c
(0/19) or MexTAg (0/18) mice injected with palygorskite developed MM, while 3/16
Balb/c and 13/14 MexTAg mice injected with crocidolite did. Lack of MM
development was associated with a decreased acute inflammatory response, as
injection of palygorskite resulted in lower percentages of macrophages (p = .006)
and neutrophils (p = .02) in the peritoneal cavity 3 d after exposure compared to
injection of crocidolite. Additionally, compared to mice injected with
crocidolite, palygorskite-injected mice had lower percentages of M2
(tumor-promoting) macrophages (p = .008) in their peritoneal cavities when
exposed to fiber for several weeks. Our study indicates that palygorskite found
in the environment in southern Nevada does not cause MM in mice, seemingly
because palygorskite, in vivo, fails to elicit inflammation that is associated
with MM development. Therefore, palygorskite is not a likely contributor to the
MM cases observed in southern Nevada.