Anti-Nerve Growth Factor Monoclonal Antibodies in Pain


Nerve growth factor (NGF), discovered by Rita Levi-Montalcini in 1952, belongs to the neurotrophin family, along with as neurotrophin-3 (NT-3), neurotrophin-4 (NT-4), and brain-derived growth factor (BDNF). It plays an important role in neuronal survival during the course of embryogenesis.1,2 During development, NGF and other neurotrophins bind to a member of the tropomyosin-related kinase (Trk) receptor family and the low-affinity p75 neurotrophin receptor (NTR) on the neuronal cell surface, then activate different signaling pathways involved in neuronal growth and survival and thus modulate pain pathogenesis.3–5 Moreover, in adults, NGF influences the nociceptive neuronal activity.6

Preclinical and clinical studies have clearly highlighted the important role of NGF in acute and chronic pain modulation. In particular, chronic pain is an extremely heterogeneous source of suffering and derives from different pathological conditions, such as osteoarthritis (OA), chronic low back pain (CLBP), cancer, and other forms of disease.7 Current therapies for the treatment of chronic pain are essentially based on pharmacological approaches (ie opiates, non-steroidal anti-inflammatory drugs [NSAIDs], and other drugs), which often lead to long-term side effects.8,9 Since NGF has been identified as an important mediator of chronic pain syndromes, new strategies of treatment based on NGF blockade or anti-NGF antibodies have been demonstrated in both preclinical and clinical trials.10 Many humanized anti-NGF monoclonal antibodies (mAbs) have been tested in clinical trials as potential pain therapies (ie tanezumab, fulranumab, and fasinumab); in particular, tanezumab was used in phase III trials in OA, although the safety of these patients was not uniformly reached.11 With regard to preclinical investigations, anti-NGF mAbs have been engineered and tested for the management of OA animal models, with encouraging results.10–13 Moreover, several studies have highlighted the effect of anti-NGF antibodies in different animal models of neuropathic pain.14–16 Thus, new therapies based on the use of different mAbs targeting the NGF pathway have been tested for chronic pain treatment in preclinical and clinical studies.

Here, we review the preclinical and clinical studies on anti-NGF mAb therapy in chronic syndromes, the role of NGF in pain transduction, and the need for anti-NGF mAbs in humans. Studies cited in this narrative review were discovered through PubMed searches. PubMed was searched for both preclinical and clinical articles related to “NGF and chronic pain” and “NGF and cancer pain”.

NGF and Pain-Related Mechanisms

NGF plays an important role in the generation and maintenance of both nociceptive and neuropathic pain by regulating a complex signaling pathway. In briefly (see Kumar and Mahal17 for more details), NGF interacts with the high-affinity TrkA and lowers the neurotrophic receptor p75 (NTR) receptors. Cell survival and neurite outgrowth are reached through the activation of TrkA-mediated Ras (Rat sarcoma) and PI3 kinase (PI3K) pathways. The TrkA-activated PI3K pathway blocks the signaling through p75NTR, which leads to apoptosis. Moreover, the activation of PI3K signaling promotes the phosphorylation of the non-selective cation channel transient receptor potential cation channel subfamily V member 1 (TRPV1), resulting in the enhancement of nociceptive function.

NGF can modulate nociception by releasing inflammatory mediators, by regulating the activity of the nociceptive ion channel/receptor and the expression of the nociceptive gene, and by the sprouting of local neurons in complex machinery involved in its downstream signaling pathways.17,18

In Vivo Preclinical Studies on the Effects of Anti-NGF mAbs in Animal Models of Chronic Pain: An Update

Since NGF can modulate pain in chronic conditions, new therapeutic approaches, based on the use of different neutralizing or antibodies targeting its pathway, have been developed and tested in animal models of chronic pain (Table 1).19–30 In particular, anti-NGF mAbs have been engineered and tested for the management of osteoarthritis (OA), a progressive degenerative joint disease. Importantly, the earlier published studies, only detected the effects of NGF blockade on pain behavior, whereas more recent studies also assessed the effects on pathological joints. These studies also highlighted some adverse effects linked to anti-NGF treatment, including cartilage damage, tibial osteophytes, and subchondral bone sclerosis.10

Table 1 Summary of In Vivo Studies on the Role of Anti-NGF in Animal Models of Chronic Pain

The first report on the effects of NGF blockade (using a neutralizing antibody against NGF) in an animal model of OA was published by McNamee et al.19 In this study, the authors used a mouse model of destabilization of the medial meniscus (DMM) of OA to test the effects of NGF and its soluble receptor, TrkAD5, in pain assessment. Their data demonstrated that TrkAD5 suppressed the pain in OA mice. Similar findings were presented by Flannery et al in a rat mono-iodoacetate (MIA) model.20 Bryden et al demonstrated that a subcutaneous injection of anti-NGF mAb, in a rat MIA model, reversed deficits in burrowing compared to non-treated mice.21 To date, few preclinical studies conducted on animal models of chronic pain have assessed both pain and joint changes after anti-NGF mAb treatment. Ishikawa et al demonstrated that a single dose of an anti-NGF antibody had a long-lasting analgesic effect on pain during motion, lesion, and joint edema in a rat model of OA.22 In the same year (2015), a research group proved, for the first time, the efficacy of a canine-specific anti-NGF mAb in a dog with degenerative joint disease.23

Another study based on pain assessment was performed by Kc et al, which assessed the effect of multiple intra-articular administrations of an anti-NGF mAb into the knee of protein kinase Cδ (PKCδ) null mice subjected to DMM surgery.24 Informative data on the evaluation of the effects of NGF blockade in pain and joint assessment were obtained by performing experiments on rat meniscal surgery models. Specifically, Nwosu et al reported that NGF blockade, obtained by inhibiting TrkA (AR786), reduced pain behavior in two rat models of OA.25 LaBranche et al26 showed that tanezumab influenced weight-bearing and subsequent cartilage damage in the rat medial meniscal tear (MMT) model. Specifically, the authors demonstrated that treatment with tanezumab (at any dose) reduced gait imbalances induced by meniscal injury in the treated rat, but increased cartilage damage and subchondral bone sclerosis compared to controls. Xu et al27 demonstrated that anti-NGF mAb treatment (mainly in the early stages of the disorder) attenuated OA but increased cartilage damage in a rat model resembling the key clinical features of OA compared to controls. Nevertheless, these studies confirmed the analgesic role of anti-NGF mAb in the treatment of OA. Majuta et al demonstrated that anti-NGF improved limb use in a rodent model, by controlling pain after joint/orthopedic surgery.28 Miyagi et al demonstrated that an injection of anti-NGF antibody into the knee joint provoked an impairment of gait and dysregulation of calcitonin gene-related peptide (CGRP) in dorsal root ganglion (DRG) neurons in a knee OA pain mouse model.29

Promising results were obtained by von Loga et al, who demonstrated the therapeutic efficacy of a novel NGF vaccine (CuMVttNGF) in the alleviation of spontaneous pain behavior in surgically induced murine OA.30

Altogether, these studies support the idea that the blockade of NGF signaling is effective in treating chronic pain, especially in OA.

Effects of Anti-NGF mAbs on Neuropathic and Cancer Pain: An Update on Preclinical Studies

NGF plays important roles in nociception and in the maintenance, development, and injury of the sensory nervous system, which are directly involved in cancer pain manifestations.31 Based on these features, numerous preclinical studies have been conducted using anti-NGF mAbs therapy to manage cancer and neuropathic pain.17,32–42 Dai et al demonstrated that NGF inhibition mitigated chronic constriction injury (CCI)-induced neuropathic pain through the inhibition of downstream p65 and mitogen-activated protein kinase (MAPK).32 da Silva et al demonstrated that anti-NGF treatment reduced chronic neuropathic pain by changing peripheral mediators and brain activity in rats with CCI.14 Similarly, Dos Reis, in a rat model of trigeminal neuropathic pain, demonstrated that local treatment with anti-NGF attenuated heat hyperalgesia.33 With regard to cancer-related pain, a few preclinical studies have been conducted using anti-NGF mAb as a potential therapeutic choice. The first report was published by Sevcik et al.34 The authors demonstrated that an innovative NGF sequestering antibody was able to relieve cancer pain-related behaviors in a mouse model of bone cancer compared to conventional treatment with morphine. Similarly, Halvorson et al, in a prostate mouse model of bone cancer pain, demonstrated that anti-NGF treatment effectively suppressed alterations in functional connectivity after cancer-induced bone pain in mice.35 Later, Mantyh et al, using a mouse model of bone cancer pain, demonstrated that the analgesia obtained with administration of anti-NGF mAb stopped the development of severe cancer pain.36 A report by Ye et al highlighted the associations between pain, proliferation, and cachexia in oral cancer.37 Similarly, Jimenez-Andrade et al demonstrated that treatment with anti-NGF therapy in the early and later stages of the disease reduced cancer pain.38 Subsequently, Kumar et al published a review on the role of NGF/TrkA signaling in the treatment of chronic pain.17 Sainoh et al demonstrated that treatment with anti-NGF antibodies could be considered a valuable tool for the treatment of neuropathic cancer pain by lowering mechanical allodynia and upregulating the expression of pain markers.39

Guedon et al conducted a study on the effects of anti-NGF mAb or anti- purinergic receptor (P2X3) on skeletal pain-related behaviors in a murine model of cancer-induced bone pain (CIBP). Their data showed that, differently from anti-P2X3, which only attenuated the hypersensitivity of the skin, anti-NGF mAbs also mitigated skeletal pain-associated behaviors.40 In 2019, Buehlmann et al demonstrated that anti-NGF mAb treatment can prevent pain-induced adaptations in brain functional networks after persistent nociceptive input from cancer-induced bone pain.41 These findings suggest that anti-NGF therapy could be used successfully to treat neuropathic cancer pain.

Clinical Trials: Safety and Efficacy of Anti-NGF mAbs in Chronic Pain Treatment

Several mAbs that bind to NGF (ie tanezumab, fulranumab, and fasinumab) have been used in clinical studies for different chronic pain conditions, especially OA. (For a comprehensive review on this topic, see Wise et al.43) Specifically, phase I and phase II clinical trials have been conducted to test the efficacy of mAbs targeting NGF in pain attenuation in both knee and hip OA.43–71 As described by Wise et al,43 two primary endpoints have been used to study NGF inhibition in knee and hip OA in different studies: the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) pain, which allows the meta-analyses of data; and function subscales, which are associated with the physician’s global assessment (PGA). Overall, all of these studies demonstrated the efficacy of anti-NGF antibodies in pain alleviation and an improvement of the main patient outcomes compared to placebo (used as a control) for hip and knee OA. Despite these enthusiastic results, the meta-analyses conducted on data that emerged from these clinical trials found that treatment with mAbs targeting NGF increased the risk of neurological adverse effects (ie paresthesia, hypoesthesia, and peripheral neuropathy). However, no differences in serious adverse effects were detected after treatment with anti-NGF antibody compared to NSAID or placebo treatments, thus indicating the safety of the treatments used in these studies. To date, the clinical trials conducted on this topic have reported that NGF inhibitors attenuated joint pain and improved function compared with NSAIDs for a duration of up to 8 weeks. Specifically, the clinical efficacy of tanezumab started from week 4 after initiation of treatment and persisted for another 8 weeks thereafter. As discussed by Wise et al,43 whereas anti-NGF mAbs produced significant pain relief and functional improvement in patients with knee and/or hip OA, clinical trials and meta-analyses conducted with tanezumab on non-specific low back pain (LBP) gave mixed and confusing findings, but showed that LBP was less responsive to anti-NGF agents than OA, even when tanezumab was used at higher doses. In particular, the meta-analysis conducted by Sanga et al, on the efficacy of anti-NGF mAbs (tanezumab, fulranumab, and fasinumab) in the treatment of CLBP, showed a slight improvement of pain and functions and an increase in neurological adverse effects compared to placebo.54 Finally, no conclusive evidence on the effectiveness of anti-NGF mAbs in chronic visceral or neuropathic pain has been presented.54

Adverse Effects of Anti-NGF mAb Therapy for OA: An Update on the Clinical Trials

Clinical trials and meta-analyses conducted on the use of anti-NGF mAbs in the treatment of OA (mainly tanezumab) reported some unforeseen side effects, particularly rapidly progressive osteoarthritis (RPOA) of both the knee and hip joints. Brown et al,44 in a randomized, double-blind, placebo-controlled phase III trial, showed that tanezumab (2.5, 5, or 10 mg, i.v.) alleviated osteoarthritic knee pain. However, an increase in neurological adverse effects was detected in the tanezumab compared to the placebo group, while no RPOA was detected. In a phase III placebo- and oxycodone-controlled study of tanezumab in adults with OA pain of the hip or knee, Spierings et al45 demonstrated the major efficacy of tanezumab in pain alleviation and the highest number of adverse effects in the oxycodone group. Similarly, Balanescu et al,46 in a phase III randomized clinical trial of tanezumab with diclofenac versus placebo in patients with OA pain of the hip or knee, showed a major efficacy of tanezumab on all primary outcomes. Total joint replacement (TJR) was frequently observed in the tanezumab group. Similar adverse events were observed in all groups, and one case of RPOA was confirmed by adjudication. Ekman et al47 tested the efficacy and safety of tanezumab (5 or 10 mg) for the treatment of OA of the knee or hip versus placebo or naproxen. They reported that tanezumab ameliorated the pain and PGA (at the dose of 5 mg) and function (at both doses) more than naproxen. No differences in side effects were detected in any treatment group, and one TJR was reported in the tanezumab group. Later, Schnitzer et al48 demonstrated that tanezumab improved pain and function in patients with OA more than NSAIDs and placebo. Regarding side effects, paresthesia and hypoesthesia were greater in patients with tanezumab than in patients treated with placebo and NSAIDs. Moreover, RPOA was observed mainly in patients treated with tanezumab alone. A clinical trial conducted by Birbara et al49 demonstrated the efficacy and safety of tanezumab in patients with knee or hip OA. A few cases of RPOA and TJRs were observed. Similarly, in two different clinical trials, Schnitzer et al50,51 showed that tanezumab improved all outcomes of patients with knee or hip OA. With regard to adverse effects, TJRs and RPOA were more evident in the tanezumab than in the placebo group, in a dose-dependent manner. Neurological adverse effects were also detected. Berenbaum et al,52 in a randomized phase III study, demonstrated the efficacy and safety of tanezumab (2.5 or 5 mg) for OA of the hip or knee. RPOA occurred more frequently with a higher dose of tanezumab (5 mg). TJRs were similarly distributed across all three groups. Hypoesthesia and paresthesia were also detected in both tanezumab groups.

A few trials have been conducted with other mABs. Mayorga et al53 conducted a randomized clinical controlled trial to test the efficacy and safety of fulranumab as monotherapy in patients with chronic knee pain of primary OA versus placebo and oxycodone treatment. Their data showed that the fulranumab group had better outcomes compared to the oxycodone group, but not to the placebo group. Neurological adverse events were higher in the fulranumab group than in the placebo group, but similar to the oxycodone group. More cases of TJRs were detected in the fulranumab group. Subsequently, Sanga et al54 demonstrated that long-term treatment with fulranumab was generally well tolerated and efficacious in patients with knee or hip OA.

Neurological adverse events and RPOA were more common in the fulranumab than in the placebo group. Dakin et al55 demonstrated that fasinumab provided improvements in OA pain and function, compared to placebo groups. Arthropathies, TRJs, and RPOA were more often observed in the fasinumab group. From these studies, it emerged that RPOA was associated with higher doses of anti-NGF antibodies used alone or with NSAIDs, although the underlying molecular mechanism is currently unknown. As reported by Wise et al,43 an adjudication was performed by independent committees of experts to understand the risks associated with the use of anti-NGF mAbs.56,57 The clinical trial development programs subsequently resumed using lower doses of anti-NGF mAbs (2.5 and 5 mg for tanezumab) in patients with painful knee or hip OA.12,58–71 Altogether, these studies indicate that anti-NGF mAbs represent a valuable biological therapy for OA pain, but some patients treated with the antibodies develop RPOA and neurological disorders. Unfortunately, the underlying molecular mechanisms have not been completely elucidated. It is possible that the inhibition of NGF signaling, via TrkA and p75 receptors on nociceptors, could compromise the loading signals of the joints, thus enhancing their degeneration.

Conclusions and Future Perspectives

Accumulating pieces of evidence have demonstrated that anti-NGF mAb therapy (ie fasinumab and tanezumab) ameliorates different chronic pain conditions, especially OA, CLBP, and neuropathic pain. Moreover, the analgesic efficacy of these anti-NGF antibodies is potentiated by the reduction of adverse effects associated with conventional pharmacological pain therapies (NSAIDs and opioids).72,73 Thus, anti-NGF mAb therapy could represent an alternative non-opioid therapeutic choice for pain management. Further studies are needed to understand the levels of analgesic effect, duration, immunogenicity, and potential adverse events of anti-NGF mAbs. Wtih regard to adverse events, in patients with large joint OA and treated with anti-NGF antibodies, RPOA and joint fractures have been reported. Thus, to ensure the safety of anti-NGF mAb treatment in these patients and others with chronic pain syndromes, it is necessary to set up new clinical studies focused on the identification of risk factors of patients with OA who manifest RPOA.


Sabrina Bimonte and Marco Cascella are co-first authors for this study. The authors report no conflicts of interest in this work.


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Anti-Nerve Growth Factor Monoclonal Antibodies in Pain was seen on

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