Retinoic acid-related Orphan Receptors (RORs) are a family of orphan nuclear receptors that play a role in numerous physiological processes, including circadian rhythm and bone metabolism. The RAR-related orphan receptors (RORs) are members of the nuclear receptor family of intracellular transcription factors. There are three forms of ROR, ROR-α, β, and γ, and each is encoded by a separate gene RORA, RORB, and RORC respectively. They bind to DNA elements called ROR response elements (RORE). RORs are involved in the maintenance of the circadian rhythm, development of the cerebellum and lymph nodes, lipid metabolism, immune response, and maintenance of bone. The mechanism of action (MOA) of ROR is that work by it seems that the RORs are activated by oxysterols, internal ligands of RORs. A number of other natural substances have also been reported to bind to the RORs. These include all-trans retinoic acid binds with high affinity to ROR-β and -γ but not ROR-α. The RORs may function as lipid sensors and hence may play a role in the regulation of lipid metabolism.
Some synthetic ROR-γ inverse agonists are in various stages of drug development for the treatment of inflammatory diseases. ROR-γ agonists have also been proposed for use as immune-oncology agents to activate the immune system to treat cancer. For instance, according to the Centers For Disease Control and Prevention 2021, about 1 in 4 US adults (23.7%) or about 58.5 million people have been diagnosed with arthritis. Arthritis is more common in women (23.5%) compared with men (18.1%). Moreover, the development of novel molecules by many market players is coming up to overcome challenges in therapy. For instance, Boehringer Ingelheim’s (BI 730357) for the treatment of psoriasis and spondylitis is under the various stages of clinical studies.
Drugs under the Pipeline for ROR:
Clinical Activity and Developments of ROR:
Till June 2023, more than 14 companies having approximately 33 molecules targeting the many cancers , skin disorders and autoimmune diseases. For these molecules, more than 49 clinical trials are being conducted and majority are in phase-2, phase-3 clinical trials by the players across the globe. For instance,
Molecule Name |
Number of Studies |
BI 730357 |
15 |
Zilovertamab (UC-961) |
9 |
XT-0528 |
4 |
AZD0284 |
3 |
GNC-035 |
3 |
The molecules such as BI 730357 developed by Boehringer Ingelheim for the line of treatment is under development for the treatment of moderate to severe plaque psoriasis and ankylosing spondylitis. The drug candidate acts by targeting retinoic acid-related orphan receptor gamma (ROR gamma) receptor. It is administered through oral route as a film coated tablet. Moreover, AstraZeneca’s AZD0284 for the potential treatment of Plaque psoriasis. Psoriasis is a skin condition that causes red, flaky, crusty patches of skin covered with silvery scales.is under the clinical development.
The indication of BI 730357 is treatment of moderate to severe plaque psoriasis and ankylosing spondylitis.
Major market players include Boehringer Ingelheim, Oncternal Therapy, Boston Pharma, Xenter, Astrazeneca, etc are few leading market players.
Major Indications for ROR are used to treat autoimmune diseases, cancers,Psoriasis and other skin disorders , etc.
There are a total of 15 molecules that are in the Phase-1, Phase-2 and Phase-3 clinical development.