The opioid growth factor (OGF) and low dose naltrexone (LDN) suppress human ovarian cancer progression in mice.

Abstract:

OBJECTIVE:The opioid growth factor (OGF) and its receptor, OGFr, serve as a tonically active inhibitory axis regulating cell proliferation in normal cells and a variety of cancers, including human ovarian cancer. Blockade of OGF and OGFr with the nonselective opioid receptor antagonist naltrexone (NTX) upregulates expression of OGF and OGFr. Administration of a low dosage of NTX (LDN) blocks endogenous opioids from opioid receptors for a short period of time (4-6 h) each day, providing a window of 18-20 h for the upregulated opioids and receptors to interact. The present study investigated the repercussions of upregulating the OGF-OGFr axis by treatment with OGF or LDN on human ovarian tumorigenesis in vivo. METHODS:Female nude mice were transplanted intraperitoneally with SKOV-3 human ovarian cancer cells and treated on a daily basis with OGF (10 mg/kg), LDN (0.1 mg/kg), or an equivalent volume of vehicle (saline). Tumor burden, as well as DNA synthesis, apoptosis, and angiogenesis was assessed in tumor tissue following 40 days of treatment. RESULTS:OGF and LDN markedly reduced ovarian tumor burden (tumor nodule number and weight). The mechanism of action was targeted to an inhibition of tumor cell proliferation and angiogenesis; no changes in cell survival were noted. CONCLUSIONS:This study shows that a native opioid pathway can suppress human ovarian cancer in a xenograft model, and provides novel non-toxic therapies for the treatment of this lethal neoplasia.

journal_name

Gynecol Oncol

journal_title

Gynecologic oncology

authors

Donahue RN,McLaughlin PJ,Zagon IS

doi

10.1016/j.ygyno.2011.04.009

subject

Has Abstract

pub_date

2011-08-01 00:00:00

pages

382-8

issue

2

eissn

0090-8258

issn

1095-6859

pii

S0090-8258(11)00270-8

journal_volume

122

pub_type

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